Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at
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We have performed the first measurement of the coherent w the MathML source">ψ(2S) photo-production cross section in ultra-peripheral Pbsingle bondPb collisions at the LHC. This charmonium excited state is reconstructed via the w the MathML source">ψ(2S)→l+l and w the MathML source">ψ(2S)→J/ψπ+π decays, where the w the MathML source">J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about w the MathML source">22 μb−1. The cross section for coherent w the MathML source">ψ(2S) production in the rapidity interval w the MathML source">−0.9<y<0.9 is w the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si8.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=2de2471eb1571c8271b16881c6094372">width="253" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315007996-si8.gif">. The w the MathML source">ψ(2S) to w the MathML source">J/ψ coherent cross section ratio is w the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si9.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=87cca19cc70266b5e479d83fa58f1b7e">width="129" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315007996-si9.gif">. The obtained results are compared to predictions from theoretical models.

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