Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at
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We have performed the first measurement of the coherent rc">rmulatext 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)r hidden">verflow="scroll">ψretchy="false">(2variant="normal">Sretchy="false">) photo-production cross section in ultra-peripheral Pbrder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">ript>rder="0" alt="single bond" src="http://cdn.els-cdn.com/sd/entities/sbnd" class="glyphImg">ript>Pb collisions at the LHC. This charmonium excited state is reconstructed via the rc">rmulatext 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+lr hidden">verflow="scroll">ψretchy="false">(2variant="normal">Sretchy="false">)retchy="false">&rarr;row>lrow>row>+row>row>lrow>row>row> and rc">rmulatext 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+πr hidden">verflow="scroll">ψretchy="false">(2variant="normal">Sretchy="false">)retchy="false">&rarr;variant="normal">Jretchy="false">/ψrow>πrow>row>+row>row>πrow>row>row> decays, where the rc">rmulatext 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/ψr hidden">verflow="scroll">variant="normal">Jretchy="false">/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about rc">rmulatext 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−1r hidden">verflow="scroll">22 row>μbrow>row>1row>. The cross section for coherent rc">rmulatext 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)r hidden">verflow="scroll">ψretchy="false">(2variant="normal">Sretchy="false">) production in the rapidity interval rc">rmulatext 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<0.9r hidden">verflow="scroll">0.9<y<0.9 is rc">rce" 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">View the MathML sou<font color=rce" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315007996-si8.gif">ript>rder="0" style="vertical-align:bottom" width="253" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315007996-si8.gif">ript>r hidden">verflow="scroll">variant="normal">drow>σrow>row>ψretchy="false">(2variant="normal">Sretchy="false">)row>row>variant="normal">cohrow>retchy="false">/variant="normal">dy=0.83±0.19retchy="true" maxsize="2.4ex" minsize="2.4ex">(row>variant="normal">statrow>+row>variant="normal">systrow>retchy="true" maxsize="2.4ex" minsize="2.4ex">) mb. The rc">rmulatext 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)r hidden">verflow="scroll">ψretchy="false">(2variant="normal">Sretchy="false">) to rc">rmulatext 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/ψr hidden">verflow="scroll">variant="normal">Jretchy="false">/ψ coherent cross section ratio is rc">rce" 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">View the MathML sou<font color=rce" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315007996-si9.gif">ript>rder="0" style="vertical-align:bottom" width="129" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315007996-si9.gif">ript>r hidden">verflow="scroll">row>0.34row>row>0.07row>row>+0.08row>retchy="false">(row>variant="normal">statrow>+row>variant="normal">systrow>retchy="false">). The obtained results are compared to predictions from theoretical models.

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