Elsevier

Physics Letters B

Volume 751, 17 December 2015, Pages 358-370
Physics Letters B

Coherent ψ(2S) photo-production in ultra-peripheral Pbsingle bondPb collisions at sNN=2.76 TeV

https://doi.org/10.1016/j.physletb.2015.10.040Get rights and content
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Abstract

We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pbsingle bondPb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)l+l and ψ(2S)J/ψπ+π decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22μb1. The cross section for coherent ψ(2S) production in the rapidity interval 0.9<y<0.9 is dσψ(2S)coh/dy=0.83±0.19(stat+syst)mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.340.07+0.08(stat+syst). The obtained results are compared to predictions from theoretical models.

Cited by (0)

i

Deceased.

ii

Also at: University of Kansas, Lawrence, Kansas, United States.

E-mail address: [email protected].