Ratios of cross sections, σ ( Z + c     jets ) / σ ( Z + jets ) , σ ( Z + b     jets ) / σ ( Z + jets ) , and σ ( Z + c     jets ) / σ ( 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 √ 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 p T > 30     GeV and | η | < 2.4 for the jets, where p T and η represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with p T > 25     GeV and | η | < 2.4 , and the dilepton mass satisfies 71 < m Z < 111     GeV . The measured values are σ ( Z + c     jets ) / σ ( Z + jets ) = 0.102 ± 0.002 ± 0.009 , σ ( Z + b     jets ) / σ ( Z + jets ) = 0.0633 ± 0.0004 ± 0.0015 , and σ ( Z + c     jets ) / σ ( 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 s=13  TeV

Fiorina, D.
Membro del Collaboration Group
;
Montagna, P.
Membro del Collaboration Group
;
Ratti, S.  P.
Membro del Collaboration Group
;
Ressegotti, M.
Membro del Collaboration Group
;
Riccardi, C.;Salvini, P.
Membro del Collaboration Group
;
Vai, I.
Membro del Collaboration Group
;
Vitulo, P.
Membro del Collaboration Group
;
Fallavollita, F.;
2020

Abstract

Ratios of cross sections, σ ( Z + c     jets ) / σ ( Z + jets ) , σ ( Z + b     jets ) / σ ( Z + jets ) , and σ ( Z + c     jets ) / σ ( 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 √ 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 p T > 30     GeV and | η | < 2.4 for the jets, where p T and η represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with p T > 25     GeV and | η | < 2.4 , and the dilepton mass satisfies 71 < m Z < 111     GeV . The measured values are σ ( Z + c     jets ) / σ ( Z + jets ) = 0.102 ± 0.002 ± 0.009 , σ ( Z + b     jets ) / σ ( Z + jets ) = 0.0633 ± 0.0004 ± 0.0015 , and σ ( Z + c     jets ) / σ ( 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1351137
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