Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at
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We have performed the first measurement of the coherent pan id="mmlsi2" class="mathmlsrc">pan class="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)pan>pan class="mathContainer hidden">pan class="mathCode">ψ(2S)pan>pan>pan> photo-production cross section in ultra-peripheral Pbsingle bondpxl.gif" class="glyphImg imgLazyJSB">pt>single bondp://cdn.els-cdn.com/sd/entities/sbnd" class="glyphImg">pt>Pb collisions at the LHC. This charmonium excited state is reconstructed via the pan id="mmlsi3" class="mathmlsrc">pan class="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)→lp>+p>lp>−p>pan>pan class="mathContainer hidden">pan class="mathCode">ψ(2S)→p>l+p>p>l−p>pan>pan>pan> and pan id="mmlsi4" class="mathmlsrc">pan class="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/ψπp>+p>πp>−p>pan>pan class="mathContainer hidden">pan class="mathCode">ψ(2S)→J/ψp>π+p>p>π−p>pan>pan>pan> decays, where the pan id="mmlsi12" class="mathmlsrc">pan class="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/ψpan>pan class="mathContainer hidden">pan class="mathCode">J/ψpan>pan>pan> decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about pan id="mmlsi6" class="mathmlsrc">pan class="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 μbp>−1p>pan>pan class="mathContainer hidden">pan class="mathCode">22 p>μb−1p>pan>pan>pan>. The cross section for coherent pan id="mmlsi2" class="mathmlsrc">pan class="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)pan>pan class="mathContainer hidden">pan class="mathCode">ψ(2S)pan>pan>pan> production in the rapidity interval pan id="mmlsi7" class="mathmlsrc">pan class="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<0.9pan>pan class="mathContainer hidden">pan class="mathCode">−0.9<y<0.9pan>pan>pan> is pan id="mmlsi8" class="mathmlsrc">i8.gif&_user=111111111&_pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=2de2471eb1571c8271b16881c6094372">View the MathML sourcepxl.gif" data-inlimgeid="1-s2.0-S0370269315007996-si8.gif">pt>View the MathML sourcep://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315007996-si8.gif">pt>pan class="mathContainer hidden">pan class="mathCode">i8.gif" overflow="scroll">dp>σψ(2S)cohp>/dy=0.83&plusmn;0.19(stat+syst) mbpan>pan>pan>. The pan id="mmlsi2" class="mathmlsrc">pan class="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)pan>pan class="mathContainer hidden">pan class="mathCode">ψ(2S)pan>pan>pan> to pan id="mmlsi12" class="mathmlsrc">pan class="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/ψpan>pan class="mathContainer hidden">pan class="mathCode">J/ψpan>pan>pan> coherent cross section ratio is pan id="mmlsi9" class="mathmlsrc">pii=S0370269315007996&_rdoc=1&_issn=03702693&md5=87cca19cc70266b5e479d83fa58f1b7e">View the MathML sourcepxl.gif" data-inlimgeid="1-s2.0-S0370269315007996-si9.gif">pt>View the MathML sourcep://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315007996-si9.gif">pt>pan class="mathContainer hidden">pan class="mathCode">p>0.34−0.07+0.08p>(stat+syst)pan>pan>pan>. The obtained results are compared to predictions from theoretical models.

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