Data analysis in HEP and GW experiments

Louvain-La-Neuve

CP3 - Research directions and experiments
Through the analysis of data taken in high energy physics experiments we seek to determine the properties of elementary particles and the probabilities of occurrence of natural phenomena only visible at the scale of the attometer (or electroweak scale). We also search for new phenomena such as the production of new particles (predicted or not by a given theory) or anomalous cross sections or distributions. These measurements can also be used to extract or fit fundamental constants within the context of a given theoretical model, thereby providing the experimental inputs required to address phenomenology of elementary particles.

Most of the time, the processes under study are very rare and suffer from large background contaminations that need to be filtered out by sophisticated online trigger systems and through additional criteria applied on stored data. In order to achieve an optimal strategy for the signal selection, the use of specific observables from the basic reconstructed quantities from the detector is mandatory. The quality of these observables relies on the good calibration of the experimental set-up and on the quality of particle identification and reconstruction software. Furthermore this optimization must be realized while keeping a good understanding of the trigger and reconstruction efficiencies and while keeping the level of systematic uncertainties as low as possible.

Analyses strategies are therefore numerous and depend on the goal(s) to be achieved. They range from very simple and robust (e.g., cut-based analyses techniques) to more elaborated selection strategies which make use of kinematic fitting, multivariate analyses (such as artificial neural networks), or the so-called matrix element method.

Members of CP3 have been actively involved in the analysis of data collected by former CHARM II, CHORUS, ALEPH, DELPHI, H1 and ZEUS experiments. Since many years, members of CP3 participate to the analysis of the data collected by the CMS experiment at the LHC. They cover a wide range of physics topics, from top quark and Higgs boson studies to searches for SuperSymmetry and exotic particles. More recently, the analysis of the data collected by the fixed-target NA62 experiment at the SPS has also begun.

Advanced tools for simulation and data analysis of general interest for the HEP community, like DELPHES and MoMEMta, have been developed and are being maintained at CP3, although released as open-source code.

Projects

Click the title to show project description.
  • MoMEMta is a C++ software package to compute Matrix Element weights. Designed in a modular way, it covers the needs of experimental analysis workflows at the LHC. MoMEMta provides working examples for the most common final states (<latex>$tt\bar$</latex>, WW, ...). If you are an expert user, be prepared to feel the freedom of configuring your MEM computation at all levels.
    MoMEMta is based on:

    - C++, ROOT, Lua scripting language
    - Cuba (Monte-Carlo integration library)
    - External PDFs (LHAPDF by default)
    - External Matrix Elements (currently provided by our MadGraph C++ exporter plugin)

  • With the 2012 discovery of the Higgs boson at the Large Hadron Collider, LHC, the Standard Model of particle physics has been completed, emerging as a most successful description of matter at the smallest distance scales. But as is always the case, the observation of this particle has also heralded the dawn of a new era in the field: particle physics is now turning to the mysteries posed by the presence of dark matter in the universe, as well as the very existence of the Higgs. The upcoming run of the LHC at 13 TeV will probe possible answers to both issues, providing detailed measurements of the properties of the Higgs and extending significantly the sensitivity to new phenomena.

    Since the LHC is the only accelerator currently exploring the energy frontier, it is imperative that the analyses of the collected data use the most powerful possible techniques. In recent years several analyses have utilized multi-variate analysis techniques, obtaining higher sensitivity; yet there is ample room for further improvement. With our program we will import and specialize the most powerful advanced statistical learning techniques to data analyses at the LHC, with the objective of maximizing the chance of new physics discoveries.

    We are part of a network of European institutions whose goal is to foster the development and exploitation of Advanced Multi-Variate Analysis (AMVA) for New Physics searches. The network offers extensive training in both physics and advanced analysis techniques to graduate students, focusing on providing them with the know-how and the experience to boost their career prospects in and outside academia. The network develops ties with non-academic partners for the creation of interdisciplinary software tools, allowing a successful knowledge transfer in both directions. The network studies innovative techniques and identifies their suitability to problems encountered in searches for new physics at the LHC and detailed studies of the Higgs boson sector.

  • We take advantage of the large statistics being recorded by the CMS experiment in Run 2 to launch a systematic study of angular asymmetries in the ttW process, which have a potentially large sensitivity to non-SM effects.
    In synergy with the CP3 phenomenology group, we aim at reporting our results in a form that can be easily translated in EFT constraints.

  • Observability of new phenomenological models in High Energy experiments is delicate to evaluate, due to the complexity of the related detectors, DAQ chain and software. Delphes is a new framework for fast simulation of a general purpose experiment. The simulation includes a tracking system, a magnetic field, calorimetry and a muon system, and possible very forward detectors arranged along the beamline. The framework is interfaced to standard file format from event generators and outputs observable analysis data objects. The simulation takes into account the detector resolutions, usual reconstruction algorithms for complex objects (FastJet) and a simplified trigger emulation. Detection of very forward scattered particles relies on the transport in beamlines with the Hector software.

  • In July 2018 CP3 members have joined the Virgo Collaboration at the European Gravitational Observatory (EGO) near Pisa in Italy. Virgo is the European laser interferometer for gravitational wave detection. After several years of instrument upgrades, Virgo went in observation mode in August 2017, about one year and half after the two LIGO interferometers in the US had detected for the first time gravitational waves. Virgo and LIGO work in close collaboration, sharing data, analysing data and publishing together. Fundamental research in gravitational wave experimental physics was funded for the first time in Belgium at the end of 2018 with a project led by UCLouvain and ULiege. On the data analysis side the plan is on one side to investigate the properties of binary black hole coalescence events, possibly relating them to theoretical models of dark matter and/or primordial black holes, and on the other to search for a stochastic gravitational wave background originating from the very early moments of the life of the Universe, a discovery that would be foundational for cosmology. On the instrumentation side, contributions to computing and the optical system of the Virgo interferometer are planned.
    CP3 members are also actively supporting the Einstein Telescope project, a proposed underground laser interferometer project for gravitational wave detection that is expected to take over from LIGO and Virgo around 2030.

  • High-energy photon-photon and photon-proton interactions at the LHC offer interesting possibilities for the study of the electroweak sector up to TeV scale and the search for processes beyond the Standard Model. After in-depth exploratory studies, we performed using the CMS data first measurement of two-photon muon pair production as well as first ever observation of W boson pairs produced by photon fusion. Now our group is leading unique investigations of quartic couplings between photons and W and Z bosons.

  • The NA62 experiment in the North Area of the CERN SPS is now fully operational and taking data. The plan is to collect the highest statistics ever reached for <latex>$K^+$</latex> decays, of the order of <latex>$10^{13}$</latex> events in the fiducial decay region of the detector until the end of 2018. This high-intensity and high-precision setup makes it possible to probe a number of ultra-rare or forbidden decay channels. Of particular interest to the CP3 group are the LFV/LNV <latex>$K^+ \rightarrow \pi^{+}\mu^{\pm}e^{\mp}$</latex> and <latex>$K^+ \rightarrow \pi^{-}l^+l'^+ (l,l' = e,\mu})$</latex> modes.

    Many BSM theories predict some degree of LFV, including Supersymmetry or the introduction of massive neutrinos. Furthermore, there are indirect hints for New Physics in the flavor sector, e.g. in the semileptonic decays of B-mesons. Explanations for the observed discrepancies predict effects of LFV in kaon decays. These particular LFV/LNV <latex>$K \rightarrow \pi ll$</latex> processes which at present are not covered by another experiment provide an attractive opportunity to test the SM. Any observable rate for one of these modes would constitute unambiguous evidence for New Physics. Considering the statistics that will be available at NA62 the current limits on their branching-ratios could be improved by at least one order of magnitude.

  • We search for exotic decays of a Higgs boson to a pair of new light bosons, H->a1a1, where one of the light bosons decays to a pair of muons and the other one decays to a pair of b quarks. Such signatures are predicted in a number of well motivated extensions of the standard model, including the next-to-minimal supersymmetry and generic two Higgs doublet models with an additional scalar singlet.

  • Search for Higgs boson(s) within the Standard Model and beyond and also withing a minimal extension of the scalar sector (2HDM).

    The final state under study is a Z decaying into a lepton pair associated with two b-jets. This topology is sensitive to a light SM Higgs via the associate ZH production, as well as a middle mass range SM Higgs boson via the inclusive Higgs production followed by its decay into ZZ with one Z decaying into a lepton pair and the other into bbar.

    It is also very sensitive to the production of a non standard heavy Higgs boson decaying into Z plus A (pseudo scalar Higgs boson).

    Similar selection (but outside of the Z window) is also sensitive to H->aa->llbb, with "a" a generic light scalar.

  • A resonance consistent with the stanadard model Higgs boson with mass of about 125 GeV was discovered in 2012 by the CMS and ATLAS experiments at the LHC. Using the available dataset (2011+2012 LHC runs) evidence was later found of the existence of the SM-predicted decay into a pair of tau leptons. The CP3 Louvain group has been involved in the channel where the Higgs boson is produced in association with the Z boson and decays into a pair of tau leptons.

    A search for additional Higgs bosons in the general framework of models with two Higgs doublets (2HDM) was then performed by the same CP3 group using the same final state and the full Run-1 data. Models with two Higgs doublets feature a pseudoscalar boson, A, two charged scalars (H+-) and two neutral (h0 and H0) scalars, one of which is identified with the 125 GeV SM-like Higgs resonance. In some scenarios the most favored decay chain for the discovery of the additional neutral bosons is H0-->ZA-->llττ (or llbb). The search was carried out in collaboration with another group in CP3 who looks at the llbb final state.

    An update of both the SM search and the exotic one is expected using the Run-2 dataset using more advanced techniques and by adding the llee and llmumu channels.

  • Many well motivated new physics extensions of the SM include new particles whose decay width is very small and hence have a decay length which is macroscopic. One very attractive and minimal extension of the standard model is one with right-handed neutrinos with Majorana masses below the electroweak scale (low scale see-saw). This addition is able to generate both the light neutrino masses and the baryon asymmetry of the universe via low scale leptogenesis. In what is probably the most studied model that invokes the low scale seesaw, the Neutrino Minimal Standard Model [2], one of the three right-handed neutrinos is a dark matter candidate. A large allowed region of phase space for right handed neutrinos spans masses between 1 and 50 GeV with corresponding lifetimes (cτ) ranging from 10^3 to 10^-4 m. For higher masses the right handed neutrino basically decays promptly and for lower masses the probability that it decays within the detector volume is virtually zero thus giving rise to missing transverse momentum in the detector. These latter two extreme cases can be captured experimentally by standard searches at the general purpose LHC experiments, while the intermediate case is the natural target of the so-called “displaced” searches, which are highly peculiar and challenging analyses at the LHC in high demand for dedicated data reconstruction tools in order to extend their sensitivity. We intend to search for long-lived sterile neutrinos decaying at displaced vertices into a charged light lepton and hadrons. A fundamental ingredient of this search is the identification of charged tracks emerging from highly displaced vertices.

  • The CMS detector at the LHC is used to search for yet unobserved heavy (mass >100 GeV/c$^2$), long-lived (lifetime > 1 ns), electrically charged particles, called generically HSCPs.
    HSCPs can be distinguished from Standard Model particles by exploiting their unique signature: very high momentum and low velocity. These features are a consequence of their high mass and the relatively limited LHC collision energy. Two experimental techniques are used to identify such hypothetical heavy and low-velocity particles: the measurement of the ionization energy loss rate using the all-silicon tracker detector and the time-of-flight measurement with the muon detectors.

    UCL members have developed the ionization energy loss identification technique and have lead the CMS HSCP search since 2010, when the first HSCP paper became one of the first published LHC search papers. Updated results, using the 2011 dataset, were then published followed by a comprehensive paper including also searches for fractional and multiply-charged particles published using the full CMS Run-1 dataset. The results obtained by analysing the 2015 Run 2 data at 13 TeV have also been published.

    The analysis, which is very inclusive, doesn't find evidence of HSCP. It currently excludes, among various models, the existence of quasi-stable gluinos, predicted by certain realizations of supersymmetry, and Drell-Yan-produced staus with masses lower than about 1.3 TeV and 350 GeV, respectively. These and the other limits set by the analysis are the most stringent to date. The CMS HSCP papers total to date more than 300 citations.

  • The lack of observed resonances produced at the LHC motivates finding new ways of searching for BSM phenomena. This project aims at discovering possible non-resonant New Physics affecting the production of Top quark pairs, by means of a dedicated analysis of data recorded by the CMS experiment. The New Physics effects are modeled using an effective field theory (EFT), whose parameters are to be measured or constrained in a global fit.

    The analysis is conducted in close collaboration with phenomenologists to ensure the approach is theoretically sound and future-proof.

  • The discovery of a Higgs boson (H) by the ATLAS and CMS experiments fixes the value of the self-coupling λ in the scalar potential whose form is determined by the symmetries of the Standard Model and the requirement of renormalisability. Higgs boson pair production is sensitive to the self-coupling and will play a major role in investigating the scalar potential structure.

    This project consists in a search for nonresonant Higgs boson pair production via gluon fusion in the final state with two leptons, two b jets and missing transvere energy – gg → H(bb) H(WW) asking for the leptonic decay of the W's. The analysis is conducted in close collaboration with phenomenologists to ensure the approach is theoretically sound and future-proof.

  • The recent discovery of a scalar boson compatible with the Standard Model (SM) Higgs boson opened new windows to look for physics beyond the SM (BSM). An example of newly accessible phenomenology is the production of resonances decaying into two SM Higgs bosons (h) predicted by several theory families such as additional Higgs singlet/doublet or warped extra dimension.

    This project consists in a search for spin-0 or spin-2 resonances produced via gluon fusion in the final state with two leptons, two b-jets and missing transverse energy – gg → X → h(bb) h(WW) asking for the leptonic decay of the W's. In particular, we are probing a mass range between 260 GeV and 900 GeV.

  • The electroweak production cross section of single top quarks is an important measurement for LHC, being a potential window on "new physics" effects.
    Past achievements of this group include the very first measurement at 7 TeV (in t channel) with 2010 data, followed by the most precise inclusive cross section measurements of t-channel cross section at 7, 8 and 13 TeV, and the first differential measurements at 13 TeV; the most precise |Vtb| extraction from single top in the world; the first measurement of W-helicity fractions in a single-top topology; the first observation of the tW production mode; the first measurement of single-top polarization in t channel; stringent limits on anomalous tWb, tgu, tgc couplings.

  • During 2012, the CMS and ATLAS collaborations independently reported unambiguous evidence of the existence of a new particle of mass around 125 GeV.
    Several analyses are ongoing to challenge the hypothesis that the new particle is the SM Higgs. We focus on the search for its production in association with a single top quark. Due to an effect of quantum interference, this process is strongly suppressed in the Standard Model while it gets enhanced if its couplings to the top quark and to the W boson have opposite sign. An observation of this production mode would therefore be a convincing proof that this new particle does not belong to the Standard Model.
    We published the first search for this process using 8 TeV data, and we expect to achieve sensitivity to anomalous values of the top Yukawa phase during the LHC Run-II.

  • The top quark, being the heaviest known elementary particle, is a powerful tool to test QCD.
    The study of top quark pair production in Heavy Ion collisions at the LHC, making use of the dedicated Pb-Pb and p-Pb runs, will open a new road in the investigation of the Quark-Gluon Plasma.

    This research project started with the first measurement of top-pair cross section in pp collisions at 5.02 TeV, taking advantage of a "reference run" in Nov.2015. This measurement, in addition to being useful as a reference for measurements in Pb-Pb and p-Pb collisions at the same center-of-mass energy per nucleon, also provides a significant broadening of the lever arm for global PDF fits making use of top-quark data.

    More recently we reported the first observation of top quark production in p-Pb collisions, using the data at 8.16 TeV taken in Nov.2016, testing the models of nuclear modification of the gluon PDF at high Bjorken-x.

    We are now preparing future analyses in PbPb collisions. We are also interested in differential analyses in pPb collisions (to constrain nuclear PDFs) and in searches in central exclusive production pp events.

Recent Publications

Click the title to show details.
  • CMS collaboration, November 6, 2019
    Public experimental note. [Full text]

  • Alessia Saggio, Olivier Bondu, Miguel Vidal Marono, Christophe Delaere, Pieter David, Sebastien Wertz, May 29, 2019
    Private experimental note. [Full text]

  • CMS collaboration, May 29, 2019
    Public experimental note. [Full text 1] [Full text 2]

  • Vischia, Pietro, April 29, 2019
    [Abstract] [PDF]

  • Sirunyan, Albert M and others, December 18, 2018
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS Collaboration, December 17, 2018
    [Full text]

  • Working Group 5 (HL-LHC, HE-LHC), December 15, 2018
    [Abstract] [PDF] [Full text]

  • Sirunyan, Albert M and others, November 27, 2018
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS Collaboration, July 6, 2018
    Public experimental note. [Full text]

  • CMS Collaboration, July 6, 2018
    Public experimental note. [Full text]

  • CMS Collaboration, March 5, 2018
    Public experimental note. [Full text]

  • CMS Collaboration, March 5, 2018
    Public experimental note. [Full text]

  • Georgios Konstantinos Krintiras (On behalf of the CMS Collaboration), January 29, 2018
    Contribution to proceedings. [Abstract] [PDF]

  • Georgios Konstantinos Krintiras (On behalf of the CMS Collaboration), January 29, 2018
    Contribution to proceedings. [Abstract] [PDF]

  • Georgios Konstantinos Krintiras (On behalf of the CMS Collaboration), January 29, 2018
    Contribution to proceedings. [Abstract] [PDF]

  • Georgios Konstantinos Krintiras (on behalf of the CMS Collaboration), January 29, 2018
    Contribution to proceedings. [Abstract] [PDF]

  • Hamed Bakhshiansohi, January 29, 2018
    Contribution to proceedings. [Full text]

  • Hamed Bakhshiansohi, January 29, 2018
    Contribution to proceedings. [Full text]

  • Hamed Bakhshiansohi, January 29, 2018
    Contribution to proceedings. [Full text]

  • Georgios Konstantinos Krintiras (on behalf of the CMS Collaboration), January 26, 2018
    Contribution to proceedings. [Abstract] [PDF]

  • Giammanco, Andrea, December 6, 2017
    Contribution to proceedings. [Abstract] [PDF]

  • Sirunyan, A. M. and others, November 10, 2017
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Giammanco, Andrea and Schwienhorst, Reinhard, October 25, 2017
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Giammanco, Andrea and Gauld, Rhorry and Pearce, Alex, October 12, 2017
    Contribution to proceedings. [Abstract] [PDF] [Journal]

  • Sirunyan, Albert M and others, September 22, 2017
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • O. Bondu, S. Brochet, C. Delaere, M. Delcourt, B. Francois, V. Lemaitre, M. Vidal Marono, S. Wertz, August 21, 2017
    Private experimental note. [Full text]

  • O. Bondu, S. Brochet, C. Delaere, M. Delcourt, B. François, V. Lemaître, M. Vidal Marono, S. Wertz, August 21, 2017
    Private experimental note. [Full text]

  • CMS collaboration, August 21, 2017
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text]

  • CMS Collaboration, June 6, 2017
    Public experimental note. [Full text]

  • CMS collaboration, April 4, 2017
    [Full text]

  • Khachatryan, Vardan and others, January 10, 2017
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS Collaboration, December 1, 2016
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Khachatryan, Vardan and others, October 6, 2016
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Khachatryan, Vardan and others, October 6, 2016
    [Abstract] [PDF] [Journal] [Dial]

  • Sirunyan, Albert M and others, October 4, 2016
    Refereed paper. Public experimental note. [Abstract] [PDF] [Journal] [Dial]

  • CMS collaboration, June 16, 2016
    Public experimental note. [Full text]

  • ATLAS and CMS collaborations, May 24, 2016
    Public experimental note. [Full text]

  • CMS collaboration, April 28, 2016
    Public experimental note. [Full text]

  • CMS collaboration, April 28, 2016
    Public experimental note. [Full text]

  • CMS collaboration, April 28, 2016
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text]

  • CMS Collaboration, April 27, 2016
    Public experimental note. [Full text]

  • CMS Collaboration, April 22, 2016
    Public experimental note. [Full text]

  • CMS Collaboration, April 22, 2016
    Public experimental note. [Full text]

  • CMS Collaboration, April 22, 2016
    Public experimental note. [Full text]

  • Khachatryan, Vardan and others, April 19, 2016
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS collaboration, March 25, 2016
    Public experimental note. [Full text]

  • Backović, Mihailo, March 3, 2016
    Refereed paper. [Abstract] [PDF]

  • CMS Collaboration, March 3, 2016
    Public experimental note. [Full text]

  • CMS Collaboration, December 1, 2015
    Public experimental note. [Full text]

  • Andrea Giammanco, November 23, 2015
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text]

  • Khachatryan, Vardan and others, November 9, 2015
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS collaboration, October 29, 2015
    Public experimental note. [Full text]

  • Khachatryan, Vardan and others, October 20, 2015
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS collaboration, October 3, 2015
    Public experimental note. [Full text]

  • Khachatryan, Vardan and others, September 29, 2015
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS collaboration, September 14, 2015
    Public experimental note. [Full text]

  • CMS collaboration, September 1, 2015
    Public experimental note. [Full text]

  • CMS collaboration, September 1, 2015
    Public experimental note. [Full text]

  • CMS collaboration, July 24, 2015
    Public experimental note. [Full text]

  • Khachatryan, Vardan and others, February 10, 2015
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Matthias Komm on behalf of the CMS collaboration , December 1, 2014
    Contribution to proceedings. [Abstract] [PDF]

  • C. Delaere, B. Francois, V. Lemaitre, A. Mertens, M. Vidal Marono, December 1, 2014
    Private experimental note. [Full text]

  • Abideh Jafari and Andrea Giammanco, November 30, 2014
    Private experimental note. [Full text]

  • Abideh Jafari on behalf of the CMS and ATLAS collaborations, November 30, 2014
    Contribution to proceedings. [Abstract] [PDF]

  • Andrey Popov on behalf of the CMS collaboration, November 28, 2014
    Contribution to proceedings. [Abstract] [PDF]

  • Andrey Popov on behalf of the CMS collaboration, November 28, 2014
    Contribution to proceedings. [Abstract] [PDF]

  • R. Castello, A. Caudron, C. Delaere, T.A. du Pree, A. Mertens, November 24, 2014
    Private experimental note. [Full text]

  • Khachatryan, Vardan and others, October 7, 2014
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text]

  • CMS Collaboration, September 30, 2014
    Public experimental note. [Full text]

  • Roberto Castello on behalf of CMS collaboration, July 4, 2014
    Contribution to proceedings. [Dial] [Full text]

  • CMS Collaboration, July 1, 2014
    Public experimental note. [Full text]

  • CMS Collaboration, July 1, 2014
    Public experimental note. [Abstract] [PDF]

  • CMS Collaboration, July 1, 2014
    Public experimental note. [Full text]

  • CMS Collaboration, July 1, 2014
    Public experimental note. [Full text]

  • CMS Collaboration, July 1, 2014
    Public experimental note. [Full text]

  • CMS Collaboration, July 1, 2014
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS Collaboration, July 1, 2014
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Chatrchyan, Serguei and others, July 1, 2014
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Marono, Miguel Vidal, June 19, 2014
    Contribution to proceedings. [Abstract] [PDF] [Dial] [Full text]

  • Miguel Vidal Maroño, June 19, 2014
    Contribution to proceedings. [Dial] [Full text]

  • Miguel Vidal Maroño, June 19, 2014
    Contribution to proceedings. [Dial] [Full text]

  • E. Boos, V. Bunichev, L. Dudko, N. Tsirova, A. Markina, M. Perfilov, A. Popov, I. Myagkov, I. Shvetsov, G. Vorotnikov, S. Bitioukov, D. Konstantinov, A. Giammanco, J. Hansen, J. Komaragiri, D. Martschei, Th. Muller, J. Ott, T. Peiffer, S. Rocker, J. Wagner-Kuhr, A. O. M. Iorio, M. Merola, L. Lista, A. Jafari, June 12, 2014
    Private experimental note. [Full text]

  • da Silveira, Gustavo G., June 11, 2014
    Contribution to proceedings. [Abstract] [PDF]

  • da Silveira, Gustavo G., June 11, 2014
    Contribution to proceedings. [Abstract] [PDF]

  • CMS Collaboration, June 9, 2014
    Public experimental note. [Full text]

  • Andrea Giammanco, June 9, 2014
    Contribution to proceedings.

  • T. Chwalek, A. Giammanco, M. Kadastik, M. Komm, D. Konstantinov, J. Pata, S. Rocker, A. Tiko, F. Roscher, J. Wagner-Kuhr, June 9, 2014
    Private experimental note.

  • Abideh Jafari for the CMS Collaboration, June 7, 2014
    Contribution to proceedings. [Journal] [Full text]

  • A. Jafari, A. O. Iorio, J. D'Hondt, J. Wagner Kuhr, L. Lista, R. Gonzalez Suarez, A. Giammanco, June 7, 2014
    Private experimental note. [Full text]

  • A. Anuar, A. Bean, K. Bloom, C. Boeser, T. Chwalek, S. Fink, A. Giammanco, R. Gonzalez Suarez, D. Knowlton, J. Komaragiri, M. Komm, B. Maier, D. Noonan, A. Popov, J. Wagner-Kuhr, June 7, 2014
    Private experimental note. [Full text]

  • Chatrchyan, Serguei and others, February 10, 2014
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text]

  • Chatrchyan, Serguei and others, January 18, 2014
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Forthomme, Laurent, January 8, 2014
    Contribution to proceedings. [Abstract] [PDF]

  • T. Chwalek, A. Giammanco, A. O. M. Iorio, M. Kadastik, M. Komm, D. Konstantinov, J. Pata, M. Piibeleht, A. Popov, L. Rebane, A. Remm, S. Roecker, A. Tiko, F. Roscher, J. Wagner-Kuhr, September 23, 2013
    Private experimental note. [Full text]

  • CMS Collaboration, September 23, 2013
    Public experimental note. [Full text]

  • The CMS Collaboration, August 26, 2013
    Public experimental note. [Full text]

  • A. Pin V. Lemaitre C. Beluffi J. Vizan , August 26, 2013
    Private experimental note. [Full text]

  • Tristan du Pree (for the CMS Collaboration), August 26, 2013
    Contribution to proceedings. [Full text]

  • The CMS Collaboration, August 26, 2013
    Public experimental note. [Full text]

  • Tristan du Pree, Roberto Castello, Ludivine Ceard, Anne-Marie Magnan, Andrew Gilbert, Christophe Delaere, Adrien Caudron, Jerome de Favereau, August 26, 2013
    Private experimental note. [Full text]

  • A. Descroix, T. du Pree, P. Van Mulders, G. Van Onsem, J. Vizan, August 26, 2013
    Private experimental note. [Full text]

  • Wolfgang Adam, J\'er\'emy Andrea, Camille Beluffi, Daniel Bloch, Adrien Caudron, Harry Cheung, Caroline Collard, Thomas Danielson, Alexis Descroix, Tristan du Pree, Juan Pablo Fernandez Ramos, Cristina Ferro, Alex Garabedian, Pablo Goldenzweig, Juan Pablo Gomez Cardona, Rebekka Hoing, Ketino Kaadze, James Keaveney, Dan Knowlton, Patricia Lobelle Pardo, Michael Maes, Sudhir Malik, Ivan Marchesini, Ernesto Migliore, Niklas Mohr, Marco Musich, Meenakshi Narain, Andrea Rizzi, Alexander Schmidt, Luca Scodellaro, Michael Segala, Pedro Silva, Thomas Speer, Alberto Traverso, Pierre Van Hove, Petra Van Mulders, Gerrit Van Onsem, Caterina Vernieri, Jesus Vizan, Roberval Walsh, Jinzhong Zhang, August 26, 2013
    Private experimental note. [Full text]

  • A.Pin, T. du Pree, R. Castello, J. Vizan C. Beluffi, A. Caudron, C. Delaere, V. Lemaitre, August 26, 2013
    Private experimental note. [Full text]

  • The CMS Collaboration, August 26, 2013
    Refereed paper. Public experimental note. [Abstract] [PDF] [Journal] [Dial]

  • Tristan du Pree (for the CMS Collaboration), August 26, 2013
    Contribution to proceedings. [Full text]

  • Wolfgang Adam, J\'er\'emy Andrea, Camille Beluffi, Daniel Bloch, Adrien Caudron, Harry Cheung, Caroline Collard, Thomas Danielson, Alexis Descroix, Tristan du Pree, Alberto Escalante, Dinko Ferencek, Juan Pablo Fernandez Ramos, Cristina Ferro, Alex Garabedian, Pablo Goldenzweig, Juan Pablo Gomez Cardona, Rebekka Hoing, Ketino Kaadze, James Keaveney, Dan Knowlton, Patricia Lobelle Pardo, Michael Maes, Sudhir Malik, Ivan Marchesini, Ernesto Migliore, Niklas Mohr, Marco Musich, Meenakshi Narain, Andrea Rizzi, Alexander Schmidt, Luca Scodellaro, Michael Segala, Pedro Silva, Thomas Speer, Alberto Traverso, Pierre Van Hove, Petra Van Mulders, Gerrit Van Onsem, Caterina Vernieri, Jesus Vizan, Roberval Walsh, Jinzhong Zhang, August 26, 2013
    Private experimental note. [Full text]

  • CMS Collaboration, May 31, 2013
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text 1] [Full text 2]

  • CMS Collaboration, May 6, 2013
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS Collaboration, May 6, 2013
    Public experimental note. [Full text]

  • CMS Collaboration, May 6, 2013
    Public experimental note. [Full text]

  • CMS Collaboration, May 6, 2013
    Public experimental note. [Full text]

  • CMS Collaboration, March 7, 2013
    Public experimental note. [Full text]

  • Andrea Giammanco, February 14, 2013
    Refereed paper. [Full text]

  • The CDF Collaboration, December 16, 2012
    [Abstract] [PDF] [Journal]

  • J. Freeman, T. Junk, M. Kirby, Y. Oksuzian, T. J. Phillips, F. D. Snider, M. Trovato, J. Vizan, W. M. Yao, December 11, 2012
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • The CDF Collaboration, December 6, 2012
    [Abstract] [PDF] [Journal]

  • The CDF Collaboration, December 6, 2012
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • Rahmat Rahmat and Andrea Giammanco, September 28, 2012
    Contribution to proceedings. [Full text]

  • CMS Collaboration, September 28, 2012
    Public experimental note. [Full text]

  • CMS Collaboration, September 28, 2012
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS Collaboration, September 28, 2012
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • The CMS Collaboration, May 23, 2012
    Public experimental note. [Full text]

  • R. Castello, L. Ceard, C. Delaere, A. Pin, and T.A. du Pree , May 23, 2012
    Private experimental note. [Full text]

  • Chatrchyan, SergueiProg. Part. Nucl. Phys. and others, April 10, 2012
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text]

  • S. Podolsky, E. Cortina, N. Lurkin, April 5, 2012
    Contribution to proceedings. [Full text]

  • The CMS Collaboration, February 9, 2012
    Public experimental note. [Full text]

  • R. Castello, L. Ceard, C. Delaere, T.A. Du Pree, A. Gilbert, N.Heracleous, A.M. Magnan, February 9, 2012
    Private experimental note. [Full text]

  • R. Castello, L. Ceard, C. Delaere, T.A. du Pree, A. Gilbert, J. Hauk, N. Heracleous, A.-M. Magnan, E. Migliore, M. Musich, and A. Nikitenko, February 9, 2012
    Private experimental note. [Full text]

  • Tristan du Pree, Ludivine Ceard, Jerome de Favereau, Christophe Delaere, February 9, 2012
    Private experimental note. [Full text]

  • Giammanco, Andrea, January 24, 2012
    Contribution to proceedings. [Abstract] [PDF]

  • CMS collaboration, September 28, 2011
    Public experimental note. [Full text]

  • The CMS Collaboration, June 30, 2011
    Public experimental note. [Full text]

  • Chatrchyan, Serguei and others, June 16, 2011
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • The CMS Collaboration, March 11, 2011
    Public experimental note. [Full text]

  • L. Ceard, J. de Favereau, C. Delaere and T. du Pree , March 11, 2011
    Private experimental note. [Full text]

  • S. Basegmez, G. Bruno, D. Pagano et al., February 9, 2011
    Private experimental note. [Full text]

  • The CMS Collaboration, February 8, 2011
    Refereed paper. [Abstract] [PDF] [Journal] [Dial] [Full text]

  • The CMS Collaboration, February 8, 2011
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CERN NA62 collaboration: C. Lazzeroni et al., January 27, 2011
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • J. Caudron for the CMS Collaboration, December 31, 2010
    Contribution to proceedings. [Journal] [Full text]

  • A. Giammanco, December 31, 2010
    Contribution to proceedings. [Journal] [Full text]

  • A. Giammanco, December 31, 2010
    Contribution to proceedings. [Full text]

  • J. Caudron, A. Giammanco, A. Pin, V. Lemaitre, December 31, 2010
    Private experimental note. [Full text]

  • CMS collaboration, December 31, 2010
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • CMS collaboration, December 31, 2010
    Public experimental note. [Full text]

  • P. Azzurri, J. Caudron, D. Dobur, A. Hinzmann, T. Klimkovich, S. Lowette, July 29, 2010
    Private experimental note. [Full text]

  • J. Caudron, A. Giammanco, A. Hinzmann, T. Klimkovich, P. Azzurri, S. Lowette, D. Dobur, July 29, 2010
    Private experimental note. [Full text]

  • The CMS Collaboration, July 29, 2010
    Public experimental note. [Full text]

  • Nicolas Schul for the CMS Collaboration, July 1, 2010
    Contribution to proceedings. [Full text]

  • Luukka, P. and others, February 12, 2010
    Refereed paper. [Journal]

  • De Roeck, A. and others, October 21, 2009
    Contribution to proceedings. [Abstract] [PDF] [Journal] [Dial]

  • The CMS Collaboration, July 8, 2009
    Public experimental note. [Full text]

  • J. Caudron, A. Giammanco, V. Lemaitre, July 8, 2009
    Private experimental note. [Full text]

  • The CMS Collaboration, July 8, 2009
    Public experimental note. [Full text]

  • A. Giammanco, J. Weinelt, T. Mueller, J. Wagner-Kuhr, P. Sturm, W. Wagner, D. Konstantinov, V. Molchanov, A. Jafari, M. Mohammadi Najafabadi, E. Boos, L. Dudko, A. Markina, July 8, 2009
    Private experimental note. [Full text]

  • Loic Quertenmont, May 15, 2009
    Contribution to proceedings. [Full text]

  • Loic Quertenmont & Vincent Roberfroid, April 27, 2009
    Public experimental note. [Full text]

  • Eduardo Cortina Gil, February 17, 2009
    Contribution to proceedings. [Full text]

  • Loic Quertenmont, January 27, 2009
    Contribution to proceedings. [Full text]

  • Loic Quertenmont, Vincent Roberfroid, January 18, 2009
    [Full text]

  • Maria Hansen et al., December 22, 2008
    Private experimental note. [Full text]

  • Andrea Giammanco, December 9, 2008
    Contribution to proceedings. [Full text]

  • The CMS Collaboration, December 9, 2008
    Public experimental note. [Full text]

  • The CMS Collaboration, December 9, 2008
    Public experimental note. [Full text]

  • G. Bruno for the ATLAS and CMS Collaborations, December 9, 2008
    Contribution to proceedings. [Full text]

  • Loic Quertenmont, September 18, 2008
    Contribution to proceedings. [Full text]

  • X. Rouby, K. Piotrzkowski, July 18, 2008
    Private experimental note. [Full text]

  • K. Piotrzkowski, July 10, 2008
    Contribution to proceedings. [Abstract] [PDF] [Journal] [Dial]

  • Tomasz Pierzchala and Krzysztof Piotrzkowski, July 7, 2008
    Contribution to proceedings. [Abstract] [PDF] [Journal] [Dial]

  • Rouby, X., June 28, 2008
    Contribution to proceedings. [Abstract] [PDF] [Journal] [Dial]

  • S. Ovyn on behalf of the CMS Collaboration, June 6, 2008
    Contribution to proceedings. [Full text]

  • S. Ovyn on behalf of the Louvain Photon group, June 6, 2008
    Contribution to proceedings. [Journal] [Full text]

  • Xavier Rouby, May 19, 2008
    Contribution to proceedings. [Abstract] [PDF]

  • S. Ovyn, X. Rouby, J.J. Hollar for the CMS Forward Physics Group, February 28, 2008
    Private experimental note. [Full text]

  • J.J. Hollar, S. Oyvn, X. Rouby for the CMS collaboration, February 26, 2008
    Public experimental note. [Full text]

  • V. Roberfroid, December 6, 2007
    Public experimental note. [Abstract] [PDF]

  • J. Hollar, S. Ovyn, X. Rouby, October 22, 2007
    Private experimental note. [Full text]

  • Dorian Kcira, October 10, 2007
    Contribution to proceedings. [Abstract] [PDF]

  • A. Giammanco, A. Perrotta, March 19, 2007
    Contribution to proceedings. [Full text]

  • Alekhin, S. and others, January 2, 2006
    Contribution to proceedings. [Abstract] [PDF]

  • Alekhin, S. and others, January 2, 2006
    Contribution to proceedings. [Abstract] [PDF]

  • Th. Delbar, D. Favart, Gh. Grégoire, S. Kalinin and Chorus collaboration Report, January 5, 2006
    Refereed paper. [Journal]

  • The CMS Collaboration, February 17, 2006
    Public experimental note. [Journal]

  • C. Delaere, V. Lemaitre, O. van der Aa, V. Roberfroid, January 28, 2006
    Public experimental note. [Full text]

  • S. Assouak, J. L. Bonnet, G. Bruno, J. Caudron, B. de Callatay, J. de Favereau de Jeneret, S. de Visscher, C. Delaere, P. Demin, D. Favart, E. Feltrin, E. Forton, G. Grégoire, S. Kalinin, D. Kcira, T. Keutgen, G. Leibenguth, V. Lemaitre, Y. Liu, D. Michotte, O. Militaru, A. Ninane, S. Ovyn, T. Pierzchala, K. Piotrzkowski, V. Roberfroid, X. Rouby, D. Teyssier, O. van der Aa, M. Vander Donckt and CMS Collaboration, December 25, 2006
    Refereed paper. [Journal]

  • G.L. Bayatian et al. (collaboration CMS), February 2, 2006
    Public experimental note.

  • Adam, W. and others, January 1, 2006
    Refereed paper. [Abstract] [PDF] [Journal] [Dial]

  • V. Lemaitre (collaboration CMS), March 1, 2006
    Refereed paper. [Journal]

  • Alekhin, S. and others, January 2, 2006
    Contribution to proceedings. [Abstract] [PDF]

  • A. Kayis-Topaksu et al. (collaboration CHORUS), October 20, 2005
    Refereed paper. [Journal]

  • G. Onengut et al. (pour la collaboration Chorus), March 3, 2005
    Refereed paper. [Journal]

  • K. Piotrzkowski and ZEUS Collaboration, October 6, 2005
    Contribution to proceedings. [Journal]

  • K. Piotrzkowski, October 6, 2005
    Refereed paper. [Journal]

  • K. Piotrzkowski, October 6, 2005
    Contribution to proceedings. [Journal]

  • Kodolova, Olga and Bruno, G. and Vardanian, I. and Nikitenko, A. and Fano, L., March 22, 2005
    Refereed paper. [Journal]

  • Arcidiacono R, et al., July 1, 2005
    Refereed paper. [Journal]

  • W. Adam et al. - 404 authors, May 11, 2005
    Refereed paper. [Journal]

  • V. Lemaitre, June 15, 2005
    Public experimental note.

  • V. Lemaitre , June 15, 2005
    Public experimental note.

  • R. Brauer et al. , December 27, 2005
    Public experimental note.

  • F. Campabadal et al., December 14, 2005
    Public experimental note.

  • V. Lemaitre for the ALEPH, DELPHI, L3 and OPAL collaborations, February 27, 2005
    Public experimental note.

  • Brauer, R. and others, December 14, 2005
    Public experimental note. [Full text]

  • M.G. Albrow et al. , June 2, 2005
    Public experimental note.

  • S. Schael et al. (ALEPH Collaboration), May 12, 2005
    Refereed paper. [Journal]

  • S. Schael et al. (ALEPH Collaboration), January 6, 2005
    Refereed paper. [Journal]