Ratios of cross sections, sigma(Z+c jets)/sigma(Z+jets), sigma(Z+b jets)/sigma(Z+jets), and sigma(Z+c jets)/sigma(Z+b jets) in the associated production of a Z boson with at least one charm or bottom quark jet are measured in proton-proton collisions at sqrt(s)=13 TeV. The data sample, collected by the CMS experiment at the CERN LHC, corresponds to an integrated luminosity of 35.9 fb^-1, with a fiducial volume of pT>30 GeV and |eta|<2.4 for the jets, where pT and eta represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with pT>25 GeV and |eta|<2.4, and the dilepton mass satisfies 71<111 GeV. The measured values are sigma(Z+c jets)/sigma(Z+jets)=0.102+-0.002+-0.009, sigma(Z+b jets)/sigma(Z+jets)=0.0633+-0.0004+-0.0015, and sigma(Z+c jets)/sigma(Z+b jets)=1.62+-0.03+-0.15. Results on the inclusive and differential cross section ratios as functions of jet and Z boson transverse momentum are compared with predictions from leading and next-to-leading order perturbative quantum chromodynamics calculations. These are the first measurements of the cross section ratios at 13 TeV.

Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at sqrt(s) =13 TeV

Meridiani P.;Amapane N.;Argiro S.;Bellan R.;Bellora A.;Cappati A.;Costa M.;Covarelli R.;Kiani B.;Migliore E.;Monaco V.;Monteil E.;Obertino M. M.;Pacher L.;Pinna Angioni G. L.;Romero A.;Salvatico R.;Sola V.;Solano A.;Soldi D.;Shchelina K.;Rumerio P.;Ravera F.;
2020-01-01

Abstract

Ratios of cross sections, sigma(Z+c jets)/sigma(Z+jets), sigma(Z+b jets)/sigma(Z+jets), and sigma(Z+c jets)/sigma(Z+b jets) in the associated production of a Z boson with at least one charm or bottom quark jet are measured in proton-proton collisions at sqrt(s)=13 TeV. The data sample, collected by the CMS experiment at the CERN LHC, corresponds to an integrated luminosity of 35.9 fb^-1, with a fiducial volume of pT>30 GeV and |eta|<2.4 for the jets, where pT and eta represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with pT>25 GeV and |eta|<2.4, and the dilepton mass satisfies 71<111 GeV. The measured values are sigma(Z+c jets)/sigma(Z+jets)=0.102+-0.002+-0.009, sigma(Z+b jets)/sigma(Z+jets)=0.0633+-0.0004+-0.0015, and sigma(Z+c jets)/sigma(Z+b jets)=1.62+-0.03+-0.15. Results on the inclusive and differential cross section ratios as functions of jet and Z boson transverse momentum are compared with predictions from leading and next-to-leading order perturbative quantum chromodynamics calculations. These are the first measurements of the cross section ratios at 13 TeV.
2020
102
3
032007
032035
Sirunyan A.M.; Tumasyan A.; Adam W.; Ambrogi F.; Bergauer T.; Brandstetter J.; Dragicevic M.; Ero J.; Escalante Del Valle A.; Flechl M.; Fruhwirth R.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1774504
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