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Charged-particle nuclear modification factors in XeXe collisions at $ \sqrt{s_{\mathrm{NN}}} = 5.44 $ TeV

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Bakhshiansohi, Hamed [UCL] Bondu, Olivier [UCL] Brochet, Sébastien [UCL] Bruno, Giacomo [UCL] Caputo, Claudio [UCL] David, Pieter [UCL] Delaere, Christophe [UCL] Delcourt, Martin [UCL] Giammanco, Andrea [UCL] Krintiras, Georgios [UCL] Lemaitre, Vincent [UCL] Magitteri, Alessio [UCL] Mertens, Alexandre [UCL] Musich, Marco [UCL] Piotrzkowski, Krzysztof [UCL] Saggio, Alessia [UCL] Vidal Marono, Miguel [UCL] Wertz, Sébastien [UCL] Zobec, Joze [UCL] CMS Collaboration

The differential yields of charged particles having pseudorapidity within |η| < 1 are measured using xenon-xenon (XeXe) collisions at $ \sqrt{s_{\mathrm{NN}}} = 5.44 $ TeV. The data, corresponding to an integrated luminosity of 3.42 μb$^{−1}$, were collected in 2017 by the CMS experiment at the LHC. The yields are reported as functions of collision centrality and transverse momentum, p$_{T}$, from 0.5 to 100 GeV. A previously reported p$_{T}$ spectrum from proton-proton collisions at $ \sqrt{s}=5.02 $ TeV is used for comparison after correcting for the difference in center-of-mass energy. The nuclear modification factors using this reference, R$_{AA}^{*}$ , are constructed and compared to previous measurements and theoretical predictions. In head-on collisions, the R$_{AA}^{*}$ has a value of 0.17 in the p$_{T}$ range of 6–8 GeV, but increases to approximately 0.7 at 100 GeV. Above ≈6 GeV, the XeXe data show a notably smaller suppression than previous results for lead-lead (PbPb) collisions at $ \sqrt{s_{\mathrm{NN}}}=5.02 $ TeV when compared at the same centrality (i.e., the same fraction of total cross section). However, the XeXe suppression is slightly greater than that for PbPb in events having a similar number of participating nucleons.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2018
Language Anglais
Journal information "Journal of High Energy Physics" - Vol. 1810, p. 138 (2018)
Peer reviewed yes
e-issn 1029-8479
Publication status Publié
Affiliation UCL - SST/IRMP - Institut de recherche en mathématique et physique
Keywords * Automatic Keywords * ; charged particle: yield ; rapidity ; nucleus
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Bibliographic reference Bakhshiansohi, Hamed ; Bondu, Olivier ; Brochet, Sébastien ; Bruno, Giacomo ; Caputo, Claudio ; et. al. Charged-particle nuclear modification factors in XeXe collisions at $ \sqrt{s_{\mathrm{NN}}} = 5.44 $ TeV. In: Journal of High Energy Physics, Vol. 1810, p. 138 (2018)
Permanent URL http://hdl.handle.net/2078.1/208047