Measurement of exclusive Y photoproduction in pPb collisions at $\sqrt{s_{_\mathrm{NN}}} = 5.02~\mathrm{TeV}$

decay modes, in ultraperipheral pPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The measurement is based on data collected by the CMS experiment corresponding to an integrated luminosity of

32.6~\mathrm{nb}^{-1}

. The Y(1S) photoproduction cross section is measured, over the rapidity range

|y|<2.2

, as a function of the photon-proton center-of-mass energy,

W_{\gamma\mathrm{p}}

, in the range

91 < W_{\gamma\mathrm{p}} < 826~\mathrm{GeV}

. The differential cross section

\mathrm{d}\sigma/\mathrm{d}|t|

, where

|t| \approx p_\mathrm{T}^2

is the squared transverse momentum of the Y(nS) mesons is measured in the range

0.01<|t|<1~\mathrm{GeV}^2

. The results are compared to other measurements and to theoretical predictions.

Note:

Preliminary results

Data
p nucleus: interaction
lead
upsilon mesons: photoproduction
vector meson: photoproduction
upsilon mesons: leptonic decay
cross section: measured
muon: pair production
differential cross section: measured
transverse momentum dependence

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Measurement of exclusive Y photoproduction in pPb collisions at sNN=5.02 TeV\sqrt{s_{_\mathrm{NN}}} = 5.02~\mathrm{TeV}sNN​​​=5.02 TeV

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Measurement of exclusive Y photoproduction in pPb collisions at $\sqrt{s_{_\mathrm{NN}}} = 5.02~\mathrm{TeV}$