Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at s $$ \sqrt{s} $$ = 13 TeV

• Main Authors: Sirunyan, A. M (Author), Tumasyan, A. (Author), Adam, W. (Author), Bergauer, T. (Author), Dragicevic, M. (Author), Erö, J. (Author), Escalante Del Valle, A. (Author), Frühwirth, R. (Author), Jeitler, M. (Author), Krammer, N. (Author), Lechner, L. (Author), Liko, D. (Author), Madlener, T. (Author), Mikulec, I. (Author), Pitters, F. M (Author), Rad, N. (Author), Schieck, J. (Author), Schöfbeck, R. (Author)
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg, 2021-11-01T14:33:14Z.
• Subjects: Article
• Online Access: Get fulltext

Abstract Measurements are presented of differential cross sections for the production of Z bosons in association with at least one jet initiated by a charm quark in pp collisions at s $$ \sqrt{s} $$ = 13 TeV. The data recorded by the CMS experiment at the LHC correspond to an integrated luminosity of 35.9 fb−1. The final states contain a pair of electrons or muons that are the decay products of a Z boson, and a jet consistent with being initiated by a charm quark produced in the hard interaction. Differential cross sections as a function of the transverse momentum pT of the Z boson and pT of the charm jet are compared with predictions from Monte Carlo event generators. The inclusive production cross section 405.4 ± 5.6 (stat) ± 24.3 (exp) ± 3.7 (theo) pb, is measured in a fiducial region requiring both leptons to have pseudorapidity |η| < 2.4 and pT > 10 GeV, at least one lepton with pT > 26 GeV, and a mass of the pair in the range 71-111 GeV, while the charm jet is required to have pT > 30 GeV and |η| < 2.4. These are the first measurements of these cross sections in proton-proton collisions at 13 TeV.