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oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/142742026-10-18T20:29:03Zopenairedrivercom_ebyu_10000col_ebyu_10001

Measurement of associated Z + charm production in proton–proton collisions at √s=8TeVSirunyan, 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.Liko, D.Madlener, T.Matsushita, T.Mikulec, I.Pree, E.Rabady, D.Rad, N.Rohringer, H.Schieck, J.Spanring, M.Spitzbart, D.Strauss, J.Waltenberger, W.Wittmann, J.Wulz, C.-E.Zarucki, M.Chekhovsky, V.Mossolov, V.Gonzalez, J. SuarezShumeiko, N.De Wolf, E.A.Janssen, X.Lauwers, J.Van De Klundert, M.Van Haevermaet, H.Van Mechelen, P.Van Remortel, N.Van Spilbeeck, A.Zeid, S. AbuBlekman, F.CMSHeavy flavourPhysicsSMPStandard model physicsVector bosonBosonsTellurium compoundsVanadium compoundsCharm+Heavy flavoursModel physicsProduction cross sectionStandard modelStandard model physicZ BosonsHadronsA 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 p p 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 pTℓ>20GeV, | ηℓ| < 2.1 , 71<m111GeV, and heavy flavour jets with pTjet>25GeV and | ηjet| < 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 the heavy flavour jet. The measurements are compared with theoretical predictions. © 2018, CERN for the benefit of the CMS collaboration.Springer Nature2018Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/14274https://doi.org/10.1140/epjc/s10052-018-5752-x1434-6044enEuropean Physical Journal Cinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/14274