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dc.contributor.authorALICE Collaboration
dc.date.accessioned2021-08-23T11:52:26Z
dc.date.available2021-08-23T11:52:26Z
dc.date.issued2021
dc.identifier.citationALICE Collaboration. (2021). First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at √sNN = 5.44 TeV. <i>Physics Letters B</i>, <i>820</i>, Article 136481. <a href="https://doi.org/10.1016/j.physletb.2021.136481" target="_blank">https://doi.org/10.1016/j.physletb.2021.136481</a>
dc.identifier.otherCONVID_100218345
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/77456
dc.description.abstractThe first measurement of the coherent photoproduction of ρ0 vector mesons in ultra-peripheral Xe–Xe collisions at sNN=5.44 TeV is presented. This result, together with previous HERA γp data and γ–Pb measurements from ALICE, describes the atomic number (A) dependence of this process, which is particularly sensitive to nuclear shadowing effects and to the approach to the black-disc limit of QCD at a semi-hard scale. The cross section of the Xe+Xe→ρ0+Xe+Xe process, measured at midrapidity through the decay channel ρ0→π+π−, is found to be dσ/dy=131.5±5.6(stat.)−16.9+17.5(syst.) mb. The ratio of the continuum to resonant contributions for the production of pion pairs is also measured. In addition, the fraction of events accompanied by electromagnetic dissociation of either one or both colliding nuclei is reported. The dependence on A of cross section for the coherent ρ0 photoproduction at a centre-of-mass energy per nucleon of the γA system of WγA,n=65 GeV is found to be consistent with a power-law behaviour σ(γA→ρ0A)∝Aα with a slope α=0.96±0.02(syst.). This slope signals important shadowing effects, but it is still far from the behaviour expected in the black-disc limit.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier BV
dc.relation.ispartofseriesPhysics Letters B
dc.rightsCC BY 4.0
dc.titleFirst measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at √sNN = 5.44 TeV
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202108234620
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.description.reviewstatuspeerReviewed
dc.relation.issn0370-2693
dc.relation.volume820
dc.type.versionpublishedVersion
dc.rights.copyright© 2021 European Organization for Nuclear Research
dc.rights.accesslevelopenAccessfi
dc.subject.ysohiukkasfysiikka
dc.subject.ysoydinfysiikka
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p15576
jyx.subject.urihttp://www.yso.fi/onto/yso/p14759
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1016/j.physletb.2021.136481


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