Jan 10 – 15, 2021
Weizmann Institute of Science
Asia/Jerusalem timezone
See you at IS2023 in Copenhagen in June 2023

Collectivity of strange, charm, and bottom hadrons in pPb and PbPb with CMS

Jan 13, 2021, 5:30 PM
Andrea’s room 1 (vDLCC)

Andrea’s room 1


oral Collective dynamics from small to large systems CD


Mr Raghunath Pradhan (Indian Institute of Technology Madras (IN))


We present the elliptic azimuthal anisotropy coefficient ($v_2$) of the identified strange hadrons ($K_{S}^{0}$ and $\Lambda$) in pPb and PbPb collisions at 5.02 TeV, and the heavy-flavor hadrons ( J/psi, D$^0$) in pPb at 8.16 TeV and high-multiplicity pp at 13 TeV, using data collected by the CMS experiment at the LHC.
The $v_2$ values of identified strange hadrons were measured for the first time using the scalar product and multi-particle method as a function of $p_{T}$ for different centralities in PbPb and event multiplicities in pPb collisions.
The results are compared to the inclusive charged hadrons as well as the hydrodynamic model calculations with different initial state conditions. The positive $v_2$ results for charm hadrons in high-multiplicity pp and pPb collisions suggest the collectivity of charm quarks.
The $v_2$ values of open heavy flavor hadrons and J/psi mesons in pp and pPb collisions are measured using the long-range two-particle correlation technique. The collectivity of b hadrons is also studied via non-prompt D$^0$ mesons (decay products of bottom hadrons) for the first time. The flavor ordering is indicated for $p_{\mathrm{T}}$ from $2-5$ GeV. The multiplicity dependence of prompt D$^0$ mesons shows the collectivity diminishes towards the small event activity regime. These measurements provide insights into the origin of the collective phenomena in small and large systems.

Primary authors

Serguei Petrushanko (M.V. Lomonosov Moscow State University (RU)) Mr Raghunath Pradhan (Indian Institute of Technology Madras (IN))

Presentation materials