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

Abstract: 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 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 pT?>20GeV, | ??| < 2.1 , 7125GeV and | ?jet| < 2.5. The Z + c production cross section is measured to be ?(pp?Z+c+X)B(Z??+?-)=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 ?(pp?Z+c+X)/?(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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: European Physical Journal C, Vol. 78, Iss. 4, Art. Num. 287 (2018)

Editorial: Springer New York LLC

 Fecha de publicación: 09/04/2018

Nº de páginas: 34

Tipo de publicación: Artículo de Revista

 DOI: 10.1140/epjc/s10052-018-5752-x

ISSN: 1434-6044,1434-6052

Url de la publicación: https://doi.org/10.1140/epjc/s10052-018-5752-x