Measurement of the Drell-Yan forward-backward asymmetry at high dilepton masses in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 2022 (2022) 063, 2022.

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 0.599 $\pm$ 0.005 (stat) $\pm$ 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' in the sequential standard model, a lower mass limit of 4.4 TeV is set at 95% confidence level.

  • Table 2

    Data from Table 2 located on page 16

    10.17182/hepdata.114012.v1/t1

    Results for the measurement of $A_\mathrm{FB}$ from the maximum likelihood fit to data in different dilepton mass bins in the...

  • Table 3

    Data from Table 3 located on page 17

    10.17182/hepdata.114012.v1/t2

    Results for the measurement of $A_0$ from the maximum likelihood fit to data in different dilepton mass bins in the...

  • Table 4

    Data from Table 4 located on page 18

    10.17182/hepdata.114012.v1/t3

    Results for the measurement of $\Delta A_\mathrm{FB}$ and $\Delta A_0$ between the muon and electron channels from the maximum likelihood...

  • Table 5

    Data from Table 5 located on page 19

    10.17182/hepdata.114012.v1/t4

    The fraction of photon-induced background as compared with the total amount of DY signal plus photon-induced events ($N_{\gamma\gamma}/(N_{\gamma\gamma} + N_\mathrm{DY})$)...

  • Figure 6

    Data is from Figure 6 located on page 20

    10.17182/hepdata.114012.v1/t5

    Exclusion limits at 95% CL on the coupling K_L for a Z' in the sequential standard model as a function...

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