Strong suppression of $\varUpsilon$ excited states in PbPb collisions at $\sqrt{s_{NN}} = 5.02~\mathrm{TeV}$ - INSPIRE

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Strong suppression of $\varUpsilon$ excited states in PbPb collisions at $\sqrt{s_{NN}} = 5.02~\mathrm{TeV}$

CMS

Collaboration

2016

9 pages

Report number:

CMS-PAS-HIN-16-008

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

Measurements of

\varUpsilon

mesons, produced in pp and PbPb collisions at

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

and reconstructed via their dimuon decay channel, are reported using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states to the ground state in both PbPb and pp collisions at the same energy. The

\varUpsilon

(2S) double ratio is studied as a function of centrality, dimuon transverse momentum, and rapidity. We find suppression in all centrality bins and no variation with kinematics. For the

\varUpsilon

(3S), no significant signal is found in the PbPb data. A search in centrality bins shows that the double ratio is significantly below unity at all centralities, an observation that indicates strong suppression in heavy-ion collisions. The centrality-integrated double ratios are

0.308 \pm 0.055 \mathrm{(stat)} \pm 0.017 \mathrm{(syst)}

for the

\varUpsilon

(2S) and less than

0.26

at

95\%

confidence level for the

\varUpsilon

(3S).

Note:

Preliminary results

Data
dimuon: transverse momentum
dimuon: decay
heavy ion: scattering
lead
p p: scattering
upsilon mesons
Upsilon(9460)
suppression
excited state

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