Speaker
Description
The second-order Fourier coefficients ($v_{2}$) are expected to reflect the overlap region of colliding heavy ions. However, a non-zero $v_{2}$ has been observed in high-multiplicity pp and pPb collisions where overlap does not exist. The CMS experiment collected data at a nucleon-nucleon center-of-mass energies 5.02 and 8.16 TeV for PbPb and pPb collisions, respectively. The dimuons were used to reconstruct the $\Upsilon$(1S) mesons. The Q-vector method is used for PbPb collisions while the long-range two-particle correlation technique is used for pPb collisions. The measurement of the $\Upsilon$(1S) $v_{2}$ is reported for both heavy ion and small collision systems. The results are discussed in the context of collectivity and modification of heavy quark dynamics.
