The elliptic azimuthal anisotropy coefficient (upsilon(2)) is measured for charm (D-0) and strange (K-S(0), Lambda, Xi(-), and Omega(-)) hadrons, using a data sample of p + Pb collisions collected by the CMS experiment, at a nucleonnucleon center-of- mass energy of root(NN)-N-s = 8.16 TeV. A significant positive upsilon(2) 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 upsilon(2) than the lighter quarks, probably reflecting a weaker collective behavior. This effect is not seen in the larger PbPb collision system at root(NN)-N-s = 5.02 TeV, also presented.

Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Elliptic Flow of Charm and Strange Hadrons in High-Multiplicity p plus Pb Collisions at √s(NN)-N-s=8.16 TeV. PHYSICAL REVIEW LETTERS, 121(8) [10.1103/PhysRevLett.121.082301].

Elliptic Flow of Charm and Strange Hadrons in High-Multiplicity p plus Pb Collisions at √s(NN)-N-s=8.16 TeV

Ciocci, M. A.;Grippo, M. T.;Messineo, A.;
2018-01-01

Abstract

The elliptic azimuthal anisotropy coefficient (upsilon(2)) is measured for charm (D-0) and strange (K-S(0), Lambda, Xi(-), and Omega(-)) hadrons, using a data sample of p + Pb collisions collected by the CMS experiment, at a nucleonnucleon center-of- mass energy of root(NN)-N-s = 8.16 TeV. A significant positive upsilon(2) 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 upsilon(2) than the lighter quarks, probably reflecting a weaker collective behavior. This effect is not seen in the larger PbPb collision system at root(NN)-N-s = 5.02 TeV, also presented.
2018
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Elliptic Flow of Charm and Strange Hadrons in High-Multiplicity p plus Pb Collisions at √s(NN)-N-s=8.16 TeV. PHYSICAL REVIEW LETTERS, 121(8) [10.1103/PhysRevLett.121.082301].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1327441