The elliptic azimuthal anisotropy coefficient (v2) is measured for charm (D0) and strange (K0S, Lambda, Xi−, and Omega−) hadrons, using a data sample of p+Pb collisions collected by the CMS experiment, at a nucleon-nucleon center-of-mass energy of sqrt(s_NN)=8.16  TeV. A significant positive v2 signal from long-range azimuthal correlations is observed for all particle species in high-multiplicity p+Pb collisions. The measurement represents the first observation of possible long-range collectivity for open heavy flavor hadrons in small systems. The results suggest that charm quarks have a smaller v2 than the lighter quarks, probably reflecting a weaker collective behavior. This effect is not seen in the larger PbPb collision system at sqrt(s_NN)=5.02  TeV, also presented.

Elliptic Flow of Charm and Strange Hadrons in High-Multiplicity p+Pb Collisions at sqrt(s_NN) =8.16 TeV

Ravera, F.;Meridiani, P.;Amapane, N.;Argiro, S.;Bellan, R.;Costa, M.;Covarelli, R.;Kiani, B.;Migliore, E.;Monaco, V.;Monteil, E.;Obertino, M. M.;Pacher, L.;Pinna Angioni, G. L.;Romero, A.;Sacchi, R.;Sola, V.;Solano, A.;Soldi, D.;
2018-01-01

Abstract

The elliptic azimuthal anisotropy coefficient (v2) is measured for charm (D0) and strange (K0S, Lambda, Xi−, and Omega−) hadrons, using a data sample of p+Pb collisions collected by the CMS experiment, at a nucleon-nucleon center-of-mass energy of sqrt(s_NN)=8.16  TeV. A significant positive v2 signal from long-range azimuthal correlations is observed for all particle species in high-multiplicity p+Pb collisions. The measurement represents the first observation of possible long-range collectivity for open heavy flavor hadrons in small systems. The results suggest that charm quarks have a smaller v2 than the lighter quarks, probably reflecting a weaker collective behavior. This effect is not seen in the larger PbPb collision system at sqrt(s_NN)=5.02  TeV, also presented.
2018
121
8
082301
082319
http://harvest.aps.org/v2/bagit/articles/10.1103/PhysRevLett.121.082301/apsxml
Physics and Astronomy (all)
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Escalante Del...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1693449
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