The elliptic azimuthal anisotropy coefficient ($v_2$) is measured for charm (D$^0$) and strange (K$_mathrmS^0$, $Lambda$, $\Xi^-$, and $Omega^-$) hadrons, using a data sample of pPb collisions collected by the CMS experiment, at a nucleon-nucleon center-of-mass energy $sqrts__mathrmNN =$ 8.16 TeV. A significant positive $v_2$ signal from long-range azimuthal correlations is observed for all particle species in high-multiplicity pPb 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 $sqrts__mathrmNN =$ 5.02 TeV, also presented.

Elliptic flow of charm and strange hadrons in high-multiplicity pPb collisions at $sqrts__mathrmNN =$ 8.16 TeV

Abbrescia, Marcello;Calabria, Cesare;Cristella, Leonardo;Errico, Filippo;Gelmi, Andrea;Lezki, Samet;Miniello, Giorgia;My, Salvatore;Nuzzo, Salvatore;Pompili, Alexis;Radogna, Raffaella;Galati, Giuliana;
2018

Abstract

The elliptic azimuthal anisotropy coefficient ($v_2$) is measured for charm (D$^0$) and strange (K$_mathrmS^0$, $Lambda$, $\Xi^-$, and $Omega^-$) hadrons, using a data sample of pPb collisions collected by the CMS experiment, at a nucleon-nucleon center-of-mass energy $sqrts__mathrmNN =$ 8.16 TeV. A significant positive $v_2$ signal from long-range azimuthal correlations is observed for all particle species in high-multiplicity pPb 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 $sqrts__mathrmNN =$ 5.02 TeV, also presented.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/218649
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