Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV
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M. B. and Zinovjev, G. and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
We have performed the first measurement of the coherent psi(2S)
photo-production cross section in ultraperipheral Pb-Pb collisions at
the LHC. This charmonium excited state is reconstructed via the psi(2S)
-> l(+)l(-) and ->(2S) -> J/psi pi(+)pi(-) decays, where the J/psi
decays into two leptons. The analysis is based on an event sample
corresponding to an integrated luminosity of about 22 mu b(-1). The
cross section for coherent psi(2S) production in the rapidity interval
-0.9 < y < 0.9is d siggma(coh)(psi(2S))/dy = 0.83 +/- 0.19 (stat+syst)
mb. The psi(2S) to J/psi coherent cross section ratio is
0.34(-0.07)(+0.08)(stat+syst). The obtained results are compared to
predictions from theoretical models. (C) 2015 CERN for the benefit of
the ALICE Collaboration. Published by Elsevier B.V.... Show more Show less