Measurement of the elliptic flow of $\Upsilon\textrm{(1S)}$ and $\Upsilon\textrm{(2S)}$ mesons in PbPb collisions at $\sqrt{\mathrm{s_{NN}}}=5.02~\mathrm{TeV}$

Measurement of the elliptic flow of $\Upsilon\textrm{(1S)}$ and $\Upsilon\textrm{(2S)}$ mesons in PbPb collisions at $\sqrt{\mathrm{s_{NN}}}=5.02~\mathrm{TeV}$

CMS

Collaboration

2019

12 pages

Report number:

CMS-PAS-HIN-19-002

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

pdf

reference search8 citations

Citations per year

Abstract:

The second-order Fourier coefficients (

v_{2}

) characterizing the azimuthal dependence of

\Upsilon\textrm{(1S)}

and

\Upsilon\textrm{(2S)}

mesons arising from PbPb collisions at

\sqrt{\mathrm{s_{NN}}}=5.02~\mathrm{TeV}

are determined. The

\Upsilon

mesons are reconstructed using the di-muon decay channel as measured using the CMS detector. The dataset was obtained in 2018 and corresponds to an integrated luminosity of 1.7

\mathrm{nb^{-1}}

. The scalar product method is used for the

v_{2}

analysis. Results are reported for the rapidity range

|y| < 2.4

, with

0 < p_{\mathrm{T}} < 50~\mathrm{GeV}

, and in four centrality classes of 0-

10\%

, 10-

30\%

, 30-

50\%

and 50-

90\%

, with 0-

10\%

corresponding to the most central collisions. The average

v_{2}

value for

\Upsilon\textrm{(1S)}

mesons is 0.007

\pm

0.011 (stat)

\pm

0.005 (syst) in the 10-

90\%

centrality interval. The observed

v_{2}

values are consistent with zero for all

p_{\mathrm{T}}

and centrality ranges, with a maximum offset of 2.5 standard deviations. The

v_{2}

value for

\Upsilon\textrm{(2S)}

mesons is measured for the first time and found to be -0.063

\pm

0.085 (stat)

\pm

0.037 (syst) in the 10-

90\%

centrality interval.

Note:

Preliminary results

Monte-Carlo
Upsilon(9460): elliptic flow
Upsilon(10020): elliptic flow
meson
angular dependence
impact parameter
Monte Carlo
rapidity
CMS
experimental results

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Measurement of the elliptic flow of Υ(1S)\Upsilon\textrm{(1S)}Υ(1S) and Υ(2S)\Upsilon\textrm{(2S)}Υ(2S) mesons in PbPb collisions at sNN=5.02 TeV\sqrt{\mathrm{s_{NN}}}=5.02~\mathrm{TeV}sNN​​=5.02 TeV

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Measurement of the elliptic flow of $\Upsilon\textrm{(1S)}$ and $\Upsilon\textrm{(2S)}$ mesons in PbPb collisions at $\sqrt{\mathrm{s_{NN}}}=5.02~\mathrm{TeV}$