Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at
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We have performed the first measurement of the coherent formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si2.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=4eb9c4bf7b26db08ce238b914ab9cc4f" title="Click to view the MathML source">ψ(2S) photo-production cross section in ultra-peripheral Pbsingle bondf" class="glyphImg imgLazyJSB">Pb collisions at the LHC. This charmonium excited state is reconstructed via the formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si3.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=acf17e94b2e8ab3faf723024574d3a0c" title="Click to view the MathML source">ψ(2S)→l+l and formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si4.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=27f45ede993743be728d5e6dc806a374" title="Click to view the MathML source">ψ(2S)→J/ψπ+π decays, where the formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si12.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=35d158d9dee1dcbfb8048751217adb53" title="Click to view the MathML source">J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si6.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=b642987941049211f5889a178951482f" title="Click to view the MathML source">22 μb−1. The cross section for coherent formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si2.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=4eb9c4bf7b26db08ce238b914ab9cc4f" title="Click to view the MathML source">ψ(2S) production in the rapidity interval i7" class="mathmlsrc">formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si7.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=c9a3c76e091b78a619cac69442e18dbb" title="Click to view the MathML source">−0.9<y<0.9 is f&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=2de2471eb1571c8271b16881c6094372">View the MathML sourcef" data-inlimgeid="1-s2.0-S0370269315007996-si8.gif">. The formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si2.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=4eb9c4bf7b26db08ce238b914ab9cc4f" title="Click to view the MathML source">ψ(2S) to formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315007996&_mathId=si12.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=35d158d9dee1dcbfb8048751217adb53" title="Click to view the MathML source">J/ψ coherent cross section ratio is f&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=87cca19cc70266b5e479d83fa58f1b7e">View the MathML sourcef" data-inlimgeid="1-s2.0-S0370269315007996-si9.gif">. The obtained results are compared to predictions from theoretical models.

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