Hide metadata

dc.date.accessioned2019-02-27T20:14:26Z
dc.date.available2019-02-27T20:14:26Z
dc.date.created2018-10-21T14:43:46Z
dc.date.issued2018
dc.identifier.citationAcharya, Shreyasi Acosta, Fernando T. Adamová, Dagmar Adolfsson, Jonatan Aggarwal, Madan M. Aglieri Rinella, Gianluca Agnello, Michelangelo Agrawal, Nikita Ahammed, Zubayer Ahn, Sang Un Alme, Johan Altenkaemper, Lucas Djuvsland, Øystein Ersdal, Magnus Rentsch Fionda, Fiorella Maria Celeste Nystrand, Joakim Rehman, Attiq ur Røhrich, Dieter Tambave, Ganesh Jagannath Ullaland, Kjetil Wagner, Boris Zhou, Zhuo Arsene, Ionut Cristian Bätzing, Paul Christoph Dordic, Olja Lardeux, Antoine Xavier Lindal, Svein Mahmood, Sohail Musa Malik, Qasim Waheed Richter, Matthias Røed, Ketil Skaali, Toralf Bernhard Tveter, Trine Spedstad Wikne, Jon Christopher Zhao, Chengxin Helstrup, Håvard Hetland, Kristin Fanebust Kileng, Bjarte Nesbø, Simon Voigt Storetvedt, Maksim Melnik Langøy, Rune Lien, Jørgen André Aiola, Salvatore Akindinov, Alexander Al-Turany, Mohammed Alam, Sk Noor De Albuquerque, Danilo Silva Aleksandrov, Dimitry Alessandro, Bruno Alfaro Molina, José Rubén ALICE, Collaboration . Dielectron production in proton-proton collisions at √s=7 TeV. Journal of High Energy Physics (JHEP). 2018, 2018:64(9), 1-47
dc.identifier.urihttp://hdl.handle.net/10852/66856
dc.description.abstractThe first measurement of e+e− pair production at mid-rapidity (|ηe| < 0.8) in pp collisions at s√=7 TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (mee < 3.3 GeV/c2), the pair transverse momentum (pT,ee < 8 GeV/c), and the pair transverse impact parameter (DCAee), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, normalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < mee < 1.1 GeV/c2), prompt and non-prompt e+e− sources can be separated via the DCAee. In the intermediate-mass region (1.1 < mee < 2.7 GeV/c2), a double-differential fit to the data in mee and pT,ee and a fit of the DCAee distribution allow the total cc¯¯ and bb¯¯¯ cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional mee and pT,ee spectra, as well as the shape of the DCAee distribution, reasonably well. However, differences in the cc¯¯ and bb¯¯¯ cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < pT < 8 GeV/c. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations.en_US
dc.languageEN
dc.publisherInstitute of Physics Publishing (IOPP)
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleDielectron production in proton-proton collisions at √s=7 TeVen_US
dc.title.alternativeENEngelskEnglishDielectron production in proton-proton collisions at √s=7 TeV
dc.typeJournal articleen_US
dc.creator.authorAcharya, Shreyasi
dc.creator.authorAcosta, Fernando T.
dc.creator.authorAdamová, Dagmar
dc.creator.authorAdolfsson, Jonatan
dc.creator.authorAggarwal, Madan M.
dc.creator.authorAglieri Rinella, Gianluca
dc.creator.authorAgnello, Michelangelo
dc.creator.authorAgrawal, Nikita
dc.creator.authorAhammed, Zubayer
dc.creator.authorAhn, Sang Un
dc.creator.authorAlme, Johan
dc.creator.authorAltenkaemper, Lucas
dc.creator.authorDjuvsland, Øystein
dc.creator.authorErsdal, Magnus Rentsch
dc.creator.authorFionda, Fiorella Maria Celeste
dc.creator.authorNystrand, Joakim
dc.creator.authorRehman, Attiq ur
dc.creator.authorRøhrich, Dieter
dc.creator.authorTambave, Ganesh Jagannath
dc.creator.authorUllaland, Kjetil
dc.creator.authorWagner, Boris
dc.creator.authorZhou, Zhuo
dc.creator.authorArsene, Ionut Cristian
dc.creator.authorBätzing, Paul Christoph
dc.creator.authorDordic, Olja
dc.creator.authorLardeux, Antoine Xavier
dc.creator.authorLindal, Svein
dc.creator.authorMahmood, Sohail Musa
dc.creator.authorMalik, Qasim Waheed
dc.creator.authorRichter, Matthias
dc.creator.authorRøed, Ketil
dc.creator.authorSkaali, Toralf Bernhard
dc.creator.authorTveter, Trine Spedstad
dc.creator.authorWikne, Jon Christopher
dc.creator.authorZhao, Chengxin
dc.creator.authorHelstrup, Håvard
dc.creator.authorHetland, Kristin Fanebust
dc.creator.authorKileng, Bjarte
dc.creator.authorNesbø, Simon Voigt
dc.creator.authorStoretvedt, Maksim Melnik
dc.creator.authorLangøy, Rune
dc.creator.authorLien, Jørgen André
dc.creator.authorAiola, Salvatore
dc.creator.authorAkindinov, Alexander
dc.creator.authorAl-Turany, Mohammed
dc.creator.authorAlam, Sk Noor
dc.creator.authorDe Albuquerque, Danilo Silva
dc.creator.authorAleksandrov, Dimitry
dc.creator.authorAlessandro, Bruno
dc.creator.authorAlfaro Molina, José Rubén
dc.creator.authorALICE, Collaboration
cristin.unitcode185,15,4,60
cristin.unitnameHøyenergifysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1622001
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of High Energy Physics (JHEP)&rft.volume=2018:64&rft.spage=1&rft.date=2018
dc.identifier.jtitleJournal of High Energy Physics (JHEP)
dc.identifier.volume2018:64
dc.identifier.issue9
dc.identifier.startpage1
dc.identifier.endpage47
dc.identifier.doihttp://dx.doi.org/10.1007/JHEP09(2018)064
dc.identifier.urnURN:NBN:no-70043
dc.subject.nviVDP::Kjerne- og elementærpartikkelfysikk: 431
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn1029-8479
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/66856/2/JHEP09%25282018%2529064.pdf
dc.type.versionPublishedVersion


Files in this item

Appears in the following Collection

Hide metadata

Attribution 4.0 International
This item's license is: Attribution 4.0 International