Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at
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We have performed the first measurement of the coherent mmlsi2" class="mathmlsrc">mulatext 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)mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><mi>ψmi><mo stretchy="false">(mo><mn>2mn><mi mathvariant="normal">Smi><mo stretchy="false">)mo>math> photo-production cross section in ultra-peripheral Pbmg border="0" alt="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 mmlsi3" class="mathmlsrc">mulatext 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&minus;mathContainer hidden">mathCode"><math altimg="si3.gif" overflow="scroll"><mi>ψmi><mo stretchy="false">(mo><mn>2mn><mi mathvariant="normal">Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><msup><mrow><mi>lmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>lmi>mrow><mrow><mo>&minus;mo>mrow>msup>math> and mmlsi4" class="mathmlsrc">mulatext 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&minus;mathContainer hidden">mathCode"><math altimg="si4.gif" overflow="scroll"><mi>ψmi><mo stretchy="false">(mo><mn>2mn><mi mathvariant="normal">Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><mi mathvariant="normal">Jmi><mo stretchy="false">/mo><mi>ψmi><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>&minus;mo>mrow>msup>math> decays, where the mmlsi12" class="mathmlsrc">mulatext 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/ψmathContainer hidden">mathCode"><math altimg="si12.gif" overflow="scroll"><mi mathvariant="normal">Jmi><mo stretchy="false">/mo><mi>ψmi>math> decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about mmlsi6" class="mathmlsrc">mulatext 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&minus;1mathContainer hidden">mathCode"><math altimg="si6.gif" overflow="scroll"><mn>22mn><mtext> mtext><msup><mrow><mtext>μbmtext>mrow><mrow><mo>&minus;mo><mn>1mn>mrow>msup>math>. The cross section for coherent mmlsi2" class="mathmlsrc">mulatext 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)mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><mi>ψmi><mo stretchy="false">(mo><mn>2mn><mi mathvariant="normal">Smi><mo stretchy="false">)mo>math> production in the rapidity interval mmlsi7" class="mathmlsrc">mulatext 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">&minus;0.9<y<0.9mathContainer hidden">mathCode"><math altimg="si7.gif" overflow="scroll"><mo>&minus;mo><mn>0.9mn><mo><mo><mi>ymi><mo><mo><mn>0.9mn>math> is mmlsi8" class="mathmlsrc">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">mg class="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">mathContainer hidden">mathCode"><math altimg="si8.gif" overflow="scroll"><mi mathvariant="normal">dmi><msubsup><mrow><mi>σmi>mrow><mrow><mi>ψmi><mo stretchy="false">(mo><mn>2mn><mi mathvariant="normal">Smi><mo stretchy="false">)mo>mrow><mrow><mi mathvariant="normal">cohmi>mrow>msubsup><mo stretchy="false">/mo><mi mathvariant="normal">dmi><mi>ymi><mo>=mo><mn>0.83mn><mo>&plusmn;mo><mn>0.19mn><mo stretchy="true" maxsize="2.4ex" minsize="2.4ex">(mo><mrow><mi mathvariant="normal">statmi>mrow><mo>+mo><mrow><mi mathvariant="normal">systmi>mrow><mo stretchy="true" maxsize="2.4ex" minsize="2.4ex">)mo><mtext> mtext><mtext>mbmtext>math>. The mmlsi2" class="mathmlsrc">mulatext 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)mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><mi>ψmi><mo stretchy="false">(mo><mn>2mn><mi mathvariant="normal">Smi><mo stretchy="false">)mo>math> to mmlsi12" class="mathmlsrc">mulatext 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/ψmathContainer hidden">mathCode"><math altimg="si12.gif" overflow="scroll"><mi mathvariant="normal">Jmi><mo stretchy="false">/mo><mi>ψmi>math> coherent cross section ratio is mmlsi9" class="mathmlsrc">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">mg class="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">mathContainer hidden">mathCode"><math altimg="si9.gif" overflow="scroll"><msubsup><mrow><mn>0.34mn>mrow><mrow><mo>&minus;mo><mn>0.07mn>mrow><mrow><mo>+mo><mn>0.08mn>mrow>msubsup><mo stretchy="false">(mo><mrow><mi mathvariant="normal">statmi>mrow><mo>+mo><mrow><mi mathvariant="normal">systmi>mrow><mo stretchy="false">)mo>math>. The obtained results are compared to predictions from theoretical models.

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