Adam, J.Brucken, E. J.Chang, B.Hilden, T. E.Kim, D. J.Kral, J.Mieskolainen, M. M.Rak, J.Räsänen, S. S.Snellman, T. W.Trzaska, W. H.The ALICE collaboration2016-01-152016-01-152015-12-17Adam, J, Brucken, E J, Chang, B, Hilden, T E, Kim, D J, Kral, J, Mieskolainen, M M, Rak, J, Räsänen, S S, Snellman, T W, Trzaska, W H & The ALICE Collaboration 2015, 'Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV', Physics Letters B, vol. 751, pp. 358-370. https://doi.org/10.1016/j.physletb.2015.10.040ORCID: /0000-0001-8893-7401/work/48397237ORCID: /0000-0002-5822-9356/work/118751804ORCID: /0000-0001-6066-8756/work/30343316http://hdl.handle.net/10138/159447We 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 sigma(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.13engcc_byinfo:eu-repo/semantics/openAccessJ/PSI PHOTOPRODUCTIONTRANSVERSE-MOMENTUMMESONSHERALHCTEVELECTROPRODUCTIONPARTICLESE(+)E(-)PHYSICSPhysical sciencesArticleopenAccess9f1d6540-6b39-4150-abcd-6a6fcea617f284946562450000365384600059