Search for a high-mass dimuon resonance produced in association with b quark jets at √s = 13 TeV

A search for high-mass dimuon resonance production in association with one or more b quark jets is presented. The study uses proton-proton collision data collected with the CMS detector at the LHC corresponding to an integrated luminosity of 138 fb−1 at a center-of-mass energy of 13 TeV. Model-independent limits are derived on the number of signal events with exactly one or more than one b quark jet. Results are also interpreted in a lepton-favor-universal model with Z ′ boson couplings to a bb quark pair (gb), an sb quark pair (gbδbs), and any same-favor charged lepton (gℓ ) or neutrino pair (gν ), with |gν | = |gℓ |. For a Z ′ boson with a mass mZ ′ = 350 GeV (2 TeV) and |δbs| < 0.25, the majority of the parameter space with 0.0057 < |gℓ | < 0.35 (0.25 < |gℓ | < 0.43) and 0.0079 < |gb| < 0.46 (0.34 < |gb| < 0.57) is excluded at 95% confdence level. Finally, constraints are set on a Z ′ model with parameters consistent with low-energy b → sℓℓ measurements. In this scenario, most of the allowed parameter space is excluded for a Z ′ boson with 350 < mZ ′ < 500 GeV, while the constraints are less stringent for higher mZ ′ hypotheses. This is the frst dedicated search at the LHC for a high-mass dimuon resonance produced in association with multiple b quark jets, and the constraints obtained on models with this signature are the most stringent to date.