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DOI: 10.5445/IR/1000083175
Veröffentlicht am 04.06.2018

Measurement of associated Z + charm production in proton–proton collisions at √s = 8 TeV

CMS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Grossmann, J.; Hörmann, N.; Hrubec, J.; Jeitler, M.; König, A.; Krätschmer, I.; ... mehr

A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7fb −1, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with p ℓ T >20GeV, |η ℓ |<2.1, 71<m ℓℓ<111GeV, and heavy flavour jets with p jet T >25GeV and |η jet |<2.5. The Z+c production cross section is measured to be σ(pp→Z+c+X)B(Z→ℓ + ℓ − )=8.8±0.5(stat)±0.6(syst)pb. The ratio of the Z+c and Z+b production cross sections is measured to be σ(pp→Z+c+X)/σ(pp→Z+b+X)=2.0±0.2(stat)±0.2(syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of t ... mehr

Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1434-6044, 1434-6052
URN: urn:nbn:de:swb:90-831754
KITopen ID: 1000083175
Erschienen in The European physical journal / C
Band 78
Heft 4
Seiten Article: 287
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 09.04.2018
Schlagworte CMS; Physics; SMP; Vector boson; Heavy flavour; Standard model physics
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