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dc.contributor.authorALICE collaboration
dc.date.accessioned2019-10-11T12:10:28Z
dc.date.available2019-10-11T12:10:28Z
dc.date.issued2019
dc.identifier.citationALICE collaboration (2019). Event-shape and multiplicity dependence of freeze-out radii in pp collisions at √s = 7 TeV. Journal of High Energy Physics, 2019 (9), 108. DOI: 10.1007/JHEP09(2019)108
dc.identifier.otherCONVID_33113379
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/65827
dc.description.abstractTwo-particle correlations in high-energy collision experiments enable the extraction of particle source radii by using the Bose-Einstein enhancement of pion production at low relative momentum q ∝ 1/R. It was previously observed that in pp collisions at s√ = 7TeV the average pair transverse momentum kT range of such analyses is limited due to large background correlations which were attributed to mini-jet phenomena. To investigate this further, an event-shape dependent analysis of Bose-Einstein correlations for pion pairs is performed in this work. By categorizing the events by their transverse sphericity ST into spherical (ST > 0:7) and jet-like (ST < 0:3) events a method was developed that allows for the determination of source radii for much larger values of kT for the first time. Spherical events demonstrate little or no background correlations while jet-like events are dominated by them. This observation agrees with the hypothesis of a mini-jet origin of the non-femtoscopic background correlations and gives new insight into the physics interpretation of the kT dependence of the radii. The emission source size in spherical events shows a substantially diminished kT dependence, while jet-like events show indications of a negative trend with respect to kT in the highest multiplicity events. Regarding the emission source shape, the correlation functions for both event sphericity classes show good agreement with an exponential shape, rather than a Gaussian one.en
dc.format.mimetypeapplication/pdf
dc.languageeng
dc.publisherSpringer
dc.relation.ispartofseriesJournal of High Energy Physics
dc.rightsCC BY 4.0
dc.subject.otherheavy ion experiments
dc.subject.otherparticle correlations and fluctuations
dc.titleEvent-shape and multiplicity dependence of freeze-out radii in pp collisions at √s = 7 TeV
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201910114405
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.description.reviewstatuspeerReviewed
dc.relation.issn1126-6708
dc.relation.numberinseries9
dc.relation.volume2019
dc.type.versionpublishedVersion
dc.rights.copyright© The Author(s) 2019
dc.rights.accesslevelopenAccessfi
dc.subject.ysohiukkasfysiikka
dc.subject.ysoionit
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p15576
jyx.subject.urihttp://www.yso.fi/onto/yso/p9015
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1007/JHEP09(2019)108
jyx.fundinginformationThe ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: Helsinki Institute of Physics (HIP), Finland.


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