The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton–lead (pPb) collisions at a nucleon–nucleon center-of-mass energy of sNN=5.02TeV, as well as results from charm quark jets in proton–proton (pp) collisions at s=2.76 and 5.02TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets from 55 to 400 GeV/c in pPb collisions at sNN=5.02TeV of RpA=0.92±0.07(stat)±0.11(syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by PYTHIA 6 for pp collisions at s=2.76 and 5.02TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c.

Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2017). Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 772, 306-329 [10.1016/j.physletb.2017.06.053].

Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at sNN=5.02 TeV

Brianza, L.;Brivio, F.;Dinardo, M. E.;Fiorendi, S.;Ghezzi, A.;Govoni, P.;Malberti, M.;Manzoni, R. A.;Paganoni, M.;Pigazzini, S.;Ragazzi, S.;Tabarelli de Fatis, T.;Lucchini, M. T.;De Guio, F.;
2017

Abstract

The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton–lead (pPb) collisions at a nucleon–nucleon center-of-mass energy of sNN=5.02TeV, as well as results from charm quark jets in proton–proton (pp) collisions at s=2.76 and 5.02TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets from 55 to 400 GeV/c in pPb collisions at sNN=5.02TeV of RpA=0.92±0.07(stat)±0.11(syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by PYTHIA 6 for pp collisions at s=2.76 and 5.02TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c.
Articolo in rivista - Articolo scientifico
Charm-tagging; CMS; Heavy ions; Heavy-flavor;
Charm-tagging; CMS; Heavy ions; Heavy-flavor; Nuclear and High Energy Physics
English
2017
772
306
329
none
Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2017). Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 772, 306-329 [10.1016/j.physletb.2017.06.053].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/187646
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