The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in protonâlead (pPb) collisions at a nucleonânucleon center-of-mass energy of sNN=5.02TeV, as well as results from charm quark jets in protonâproton (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.M., 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
Battilana, C.
;Bonacorsi, D.
;Braibant-Giacomelli, S.
;Campanini, R.
;Capiluppi, P.
;Castro, A.
;Chhibra, S. S.
;Codispoti, G.
;Cuffiani, M.
;Fanfani, A.
;Fasanella, D.
;Guiducci, L.
;Navarria, F. L.
;Rossi, A. M.
;Rovelli, T.
;Siroli, G. P.
;Tosi, N.
;
2017
Abstract
The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in protonâlead (pPb) collisions at a nucleonânucleon center-of-mass energy of sNN=5.02TeV, as well as results from charm quark jets in protonâproton (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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.