Measurement of Nuclear Modification Factors of $\Upsilon\textrm{(nS)}$ Mesons in $\text{PbPb}$ Collisions at $\sqrt{s_{_{\text{NN}}}} = 5.02~\mathrm{TeV}$

Measurement of Nuclear Modification Factors of $\Upsilon\textrm{(nS)}$ Mesons in $\text{PbPb}$ Collisions at $\sqrt{s_{_{\text{NN}}}} = 5.02~\mathrm{TeV}$

CMS

Collaboration

2017

12 pages

Report number:

CMS-PAS-HIN-16-023

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

pdf

reference search13 citations

Citations per year

Abstract:

The cross sections of

\Upsilon\textrm{(1S)}

,

\Upsilon\textrm{(2S)}

, and

\Upsilon\textrm{(3S)}

production in PbPb and pp collisions at

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

are reported. The nuclear modification factors,

R_\mathrm{AA}

, derived from the PbPb-to-pp ratio of yields for each state, are studied as a function of rapidity, transverse momentum and centrality. A strong modification is observed for all

\Upsilon

states. The suppression of

\Upsilon\textrm{(1S)}

seen in

\text{PbPb}

collisions at

\sqrt{s_{\mathrm{NN}}}

=

5.02~\mathrm{TeV}

is stronger than the previous one measured at

\sqrt{s_{\mathrm{NN}}} = 2.76~\mathrm{TeV}

, consistent with an increase in the medium temperature at the higher energy. We obtain an upper limit on the production of

\Upsilon\textrm{(3S)}

of

0.071

at

95\%

confidence level, the smallest value measured for a hadron

R_\mathrm{AA}

in heavy ion collisions so far.

Note:

Preliminary results

Data
Upsilon(10355): production
yield: ratio
upsilon mesons
heavy ion: scattering
lead
energy: high
nucleus
transverse momentum
temperature

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Measurement of Nuclear Modification Factors of Υ(nS)\Upsilon\textrm{(nS)}Υ(nS) Mesons in PbPb\text{PbPb}PbPb Collisions at sNN=5.02 TeV\sqrt{s_{_{\text{NN}}}} = 5.02~\mathrm{TeV}sNN​​​=5.02 TeV

Citations per year

Strong suppression of Υ excited states in PbPb collisions at √ sNN = 5.02 TeV

Measurement of Nuclear Modification Factors of $\Upsilon\textrm{(nS)}$ Mesons in $\text{PbPb}$ Collisions at $\sqrt{s_{_{\text{NN}}}} = 5.02~\mathrm{TeV}$