Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at
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We have performed the first measurement of the coherent an id="mmlsi2" class="mathmlsrc">an 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)an>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">ψalse">(2athvariant="normal">Salse">)ath>an>an>an> photo-production cross section in ultra-peripheral Pbalt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">Pb collisions at the LHC. This charmonium excited state is reconstructed via the an id="mmlsi3" class="mathmlsrc">an 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)&rarr;l+lan>an class="mathContainer hidden">an class="mathCode">ath altimg="si3.gif" overflow="scroll">ψalse">(2athvariant="normal">Salse">)alse">&rarr;l+lath>an>an>an> and an id="mmlsi4" class="mathmlsrc">an 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)&rarr;J/ψπ+πan>an class="mathContainer hidden">an class="mathCode">ath altimg="si4.gif" overflow="scroll">ψalse">(2athvariant="normal">Salse">)alse">&rarr;athvariant="normal">Jalse">/ψπ+πath>an>an>an> decays, where the an id="mmlsi12" class="mathmlsrc">an 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/ψan>an class="mathContainer hidden">an class="mathCode">ath altimg="si12.gif" overflow="scroll">athvariant="normal">Jalse">/ψath>an>an>an> decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about an id="mmlsi6" class="mathmlsrc">an 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 μb−1an>an class="mathContainer hidden">an class="mathCode">ath altimg="si6.gif" overflow="scroll">22 μb1ath>an>an>an>. The cross section for coherent an id="mmlsi2" class="mathmlsrc">an 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)an>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">ψalse">(2athvariant="normal">Salse">)ath>an>an>an> production in the rapidity interval an id="mmlsi7" class="mathmlsrc">an 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<0.9an>an class="mathContainer hidden">an class="mathCode">ath altimg="si7.gif" overflow="scroll">0.9<y<0.9ath>an>an>an> is an id="mmlsi8" class="mathmlsrc"><a title="View 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">ass="imgLazyJSB inlineImage" height="20" 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">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si8.gif" overflow="scroll">athvariant="normal">dσψalse">(2athvariant="normal">Salse">)athvariant="normal">cohalse">/athvariant="normal">dy=0.83±0.19axsize="2.4ex" minsize="2.4ex">(athvariant="normal">stat+athvariant="normal">systaxsize="2.4ex" minsize="2.4ex">) mbath>an>an>an>. The an id="mmlsi2" class="mathmlsrc">an 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)an>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">ψalse">(2athvariant="normal">Salse">)ath>an>an>an> to an id="mmlsi12" class="mathmlsrc">an 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/ψan>an class="mathContainer hidden">an class="mathCode">ath altimg="si12.gif" overflow="scroll">athvariant="normal">Jalse">/ψath>an>an>an> coherent cross section ratio is an id="mmlsi9" class="mathmlsrc"><a title="View 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">ass="imgLazyJSB inlineImage" height="19" 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">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si9.gif" overflow="scroll">0.340.07+0.08alse">(athvariant="normal">stat+athvariant="normal">systalse">)ath>an>an>an>. The obtained results are compared to predictions from theoretical models.

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