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dc.contributor.authorALICE Collaboration
dc.contributor.authorChang, BeomSu
dc.contributor.authorKim, Dong Jo
dc.contributor.authorParkkila, Jasper
dc.contributor.authorRak, Jan
dc.contributor.authorRäsänen, Sami
dc.contributor.authorSlupecki, Maciej
dc.contributor.authorSnellman, Tomas
dc.contributor.authorTrzaska, Wladyslaw
dc.contributor.authorVargyas, Márton
dc.contributor.authorViinikainen, Jussi
dc.date.accessioned2019-01-04T10:58:14Z
dc.date.available2019-01-04T10:58:14Z
dc.date.issued2019fi
dc.identifier.citationALICE Collaboration. (2019). Dielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at √s = 13 TeV. <em>Physics Letters B</em>, 788, 505-518. <a href="https://doi.org/10.1016/j.physletb.2018.11.009">doi:10.1016/j.physletb.2018.11.009</a>fi
dc.identifier.otherTUTKAID_80136
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/60911
dc.description.abstractThe measurement of dielectron production is presented as a function of invariant mass and transverse momentum (pT) at midrapidity (|ye| < 0.8) in proton–proton (pp) collisions at a centre-of-mass energy of √s = 13 TeV. The contributions from light-hadron decays are calculated from their measured cross sections in pp collisions at √s = 7 TeV or 13 TeV. The remaining continuum stems from correlated semileptonic decays of heavy-flavour hadrons. Fitting the data with templates from two different MC event generators, PYTHIA and POWHEG, the charm and beauty cross sections at midrapidity are extracted for the first time at this collision energy: dσcc¯/dy|y=0 = 974 ± 138 (stat.) ± 140 (syst.) ± 214(BR) μb and dσbb¯ /dy|y=0 = 79 ± 14 (stat.) ± 11 (syst.) ± 5(BR) μb using PYTHIA simulations and dσcc¯/dy|y=0 = 1417 ± 184 (stat.) ± 204 (syst.) ± 312(BR) μb and dσbb¯ /dy|y=0 = 48 ± 14 (stat.) ± 7 (syst.) ± 3(BR) μb for POWHEG. These values, whose uncertainties are fully correlated between the two generators, are consistent with extrapolations from lower energies. The different results obtained with POWHEG and PYTHIA imply different kinematic correlations of the heavy-quark pairs in these two generators. Furthermore, comparisons of dielectron spectra in inelastic events and in events collected with a trigger on high charged-particle multiplicities are presented in various pT intervals. The differences are consistent with the already measured scaling of light-hadron and open-charm production at high charged-particle multiplicity as a function of pT. Upper limits for the contribution of virtual direct photons are extracted at 90% confidence level and found to be in agreement with pQCD calculations.fi
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofseriesPhysics Letters B
dc.rightsCC BY 4.0
dc.subject.otherhiukkasfysiikkafi
dc.subject.otherproton–proton collisionsfi
dc.titleDielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at √s = 13 TeVfi
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201901031030
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2019-01-03T10:15:25Z
dc.description.reviewstatuspeerReviewed
dc.format.pagerange505-518
dc.relation.issn0370-2693
dc.relation.numberinseries0
dc.relation.volume788
dc.type.versionpublishedVersion
dc.rights.copyright© 2018 The Author.
dc.rights.accesslevelopenAccessfi
dc.format.contentfulltext
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1016/j.physletb.2018.11.009


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