The elliptic azimuthal anisotropy coefficient (v_2) is measured for charm (D^0) and strange (K_S^0, Λ, Ξ^-, and Ω^-) 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 v_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 v_2 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 sNN =8.16 TeV / Sirunyan A.M., Tumasyan A., Adam W., Ambrogi F., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Ero J., Escalante Del Valle A., Flechl M., Fruhwirth R., Ghete V.M., Hrubec J., Jeitler M., Krammer N., Kratschmer I., Liko D., Madlener T., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - ELETTRONICO. - 121:(2018), pp. 0-0. [10.1103/PhysRevLett.121.082301]

Elliptic Flow of Charm and Strange Hadrons in High-Multiplicity p+Pb Collisions at sNN =8.16 TeV

Chatterjee K.;Ciulli V.;D'Alessandro R.;Focardi E.;Latino G.;Lenzi P.;Russo L.;Viliani L.;
2018

Abstract

The elliptic azimuthal anisotropy coefficient (v_2) is measured for charm (D^0) and strange (K_S^0, Λ, Ξ^-, and Ω^-) 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 v_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 v_2 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
0
0
Sirunyan A.M.; Tumasyan A.; Adam W.; Ambrogi F.; Asilar E.; Bergauer T.; Brandstetter J.; Brondolin E.; Dragicevic M.; Ero J.; Escalante Del Valle A.;...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1176510
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