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.File | Dimensione | Formato | |
---|---|---|---|
PhysRevLett.121.082301.pdf
Accesso aperto
Tipo di file:
PDF EDITORIALE
Dimensione
438.03 kB
Formato
Adobe PDF
|
438.03 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.