2,607 research outputs found
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No full textInternational audience(Civ. 1re, 7 mai 2025, no 23-13.923, FS-B, D. 2025. 884 ; ibid. 1852, obs. H. Synvet et A.-C. Muller ; RCA 2025. Comm. 12, obs. M. Espagnon
Le préjudice et le lien de causalité à l'épreuve du contentieux de l'annulation des ventes d'installation photovoltaïque financées par un crédit affecté
No full textInternational audience(Civ. 1re, 10 juill. 2024, no 22-24.754, FS-B, D. 2024. 1325 ; ibid. 2127, chron. S. Robin-Raschel ; RTD com. 2024. 730, obs. D. Legeais ; RCA 2024. Comm. 205, obs. M. Espagnon ; JCP 2025, no 273 [3], obs. J. Knetsch
The ALICE muon spectrometer and related physics
No full textALICE is the LHC experiment dedicated to the study of heavy-ion collisions at extreme energy density where formation of the quark–gluon plasma is expected. Among the different observables, open heavy flavors and heavy quarkonia states are especially relevant. Indeed they will be copiously produced and they will provide sensitive information on the collision. In this paper, the ALICE muon spectrometer will be described as well as the installation status. A few selected topics concerning the muon physics will be addressed and the related expected performances of the ALICE muon spectrometer will be given
Etude de la brisure de symetrie de saveur dans la mer de quarks legers du nucleon au moyen du processus Drell-Yan
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Study of the isospin symmetry breaking in the light quark sea of the nucleon from the Drell-Yan process
No full textProbing the gluon Transverse Momentum-Dependent distributions inside the proton through quarkonium-pair production at the LHC
No full textTransverse momentum-dependent factorisation is used to describe hadronic collisions while taking into account the intrinsic transverse momentum of partons inside hadrons. This requires Transverse Momentum-Dependent Parton Distribution Functions (TMDPDFs or simply TMDs) which need to be extracted from experimental data. Gluon TMDs in particular remain poorly known.We propose to use quarkonium-pair production to study the two gluon TMDs accessible through unpolarised proton collisions at the Large Hadron Collider (LHC). Quarkonia are bound states of a heavy flavour quark-antiquark pair. J/psi mesons, made of a charm-anticharm pair, are produced in large amounts at the LHC. J/psi pairs originate from gluon fusion in vast majority, which is important to study gluon TMDs.We first use a simple model of Gaussian-based TMDs to compute observables in J/psi-pair production that are sensitive to the TMDs. These are the transverse-momentum spectrum of the pair and azimuthal asymmetries. We see that J/psi-pair production is an ideal process to probe the linearly-polarised gluon TMD through azimuthal asymmetries. We also use the LHCb data on the J/psi-pair transverse momentum to fit the average gluon transverse momentum.We then improve our predictions by including TMD evolution in our calculations. Indeed some contributions to the gluon TMDs can be evaluated perturbatively to improve the fit procedure. We observe that the asymmetries are suppressed but remain sizeable and could be detected at the LHC. We also provide predictions for Upsilon-pair production.We finally discuss the helicity structure of the quarkonium-pair production amplitude which explains how it maximises some azimuthal asymmetries. Moreover, it shows that the amplitude zero for longitudinally polarised pairs predicted at leading order in the collinear regime could be detected for intermediate masses as hard gluon emissions are suppressed in the TMD regime
Study of Resistive Plate Chambers for the Alice dimuon spectrometer
No full textThe trigger system of the Alice dimuon spectrometer is based on RPC detectors. We present experimental results of a beam test about rate capability, time resolution and cluster size of single gap RPC detectors operating both in 'streamer mode' and in 'avalanche mode'. We have compared the performances of small chambers (50x50 cm(2)) built with bakelite of different resistivity, from similar to 3.10(9) Omega cm to similar to 3.10(11) Omega cm. For the low resistivity RPC we obtained a rate capability of several hundreds of Hz/cm(2) when it is operating in 'streamer mode', and of several thousands of Hz/cm(2) wizen it is operating in 'avalanche mode'
A measurement of unpolarized cross sections and polarized cross section differences of deeply virtual compton scattering on the proton at Jefferson Laboratory using CLAS (e1-dvcs2)
No full textAugust 2013School of ScienceThis thesis focuses on the Deeply Virtual Compton Scattering (DVCS) reaction e + p → e' + p' + gamma(DVCS). The reaction is measured using the e1-dvcs2 experiment run at Jefferson Laboratory in Hall B using CLAS. The experiment took place from 22 October, 2008 to 23 January, 2009, and experiment run time of 90 days. This analysis focuses on the determination of the DVCS cross section in bins of x_B, Q2, t and phi, and makes a comparison with already existing and parallel analyses of DVCS. By factorizing the cross section of the reaction into perturbative and non-perturbative parts, we may relate the cross section of this reaction to Generalized Parton Distributions (GPDs) for the proton, and in doing so, provide better insight as to the distributions of quarks and gluons within it, including spatial distribution and contributions of angular momentum.Ph
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