Measurement of the Drell-Yan forward-backward asymmetry at high dilepton masses in proton-proton collisions at ?s = 13 TeV
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Dosyalar
Tarih
2022-08
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Yayıncı
Springer Science and Business Media Deutschland GmbH
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Abstract: A measurement of the forward-backward asymmetry of pairs of oppositely charged leptons (dimuons and dielectrons) produced by the Drell-Yan process in proton-proton collisions is presented. The data sample corresponds to an integrated luminosity of 138 fb?1 collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV. The asymmetry is measured as a function of lepton pair mass for masses larger than 170 GeV and compared with standard model predictions. An inclusive measurement across both channels and the full mass range yields an asymmetry of 0.612 ± 0.005 (stat) ± 0.007 (syst). As a test of lepton flavor universality, the difference between the dimuon and dielectron asymmetries is measured as well. No statistically significant deviations from standard model predictions are observed. The measurements are used to set limits on the presence of additional gauge bosons. For a Z? boson in the sequential standard model the observed (expected) 95% confidence level lower limit on the Z? mass is 4.4 TeV (3.7 TeV). [Figure not available: see fulltext.] © 2022, The Author(s)
Açıklama
Anahtar Kelimeler
Hadron-Hadron Scattering, Lepton Production, Vector Boson Production
Kaynak
Journal of High Energy Physics
