CMS-PAS-EXO-22-016

CMS-PAS-EXO-22-016
Search for a high mass dimuon resonance associated with b quark jets at $ \sqrt{s}= $ 13 TeV
CMS Collaboration
21 May 2023

Abstract: 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 events with b quark jets. Results are also interpreted in a lepton flavor-universal model with Z' boson couplings to a $ \mathrm{bb} $ quark pair ($ g_{\mathrm{b}} $), an $ \mathrm{sb} $ quark pair ($ g_{\mathrm{b}}\delta_{\mathrm{bs}} $), and any same-flavor charged lepton ($ g_{\ell} $) or neutrino pair ($ g_{\nu} $), with $ g_{\nu}=g_{\ell} $. For a Z' boson with a mass of 350 GeV (2 TeV) and $ \delta_{\mathrm{bs}}\leq $ 0.25, the majority of the parameter space with 0.0057 $ < g_{\ell} < $ 0.35 (0.25 $ < g_{\ell} < $ 0.43) and 0.0079 $ < g_{\mathrm{b}} < $ 0.46 (0.34 $ < g_{\mathrm{b}} < $ 0.57) is excluded at 95% confidence level. Finally, constraints are set on a specific Z' model with parameters consistent with low-energy $ \mathrm{b}\to\mathrm{s}\ell\ell $ measurements. In this scenario, most of the allowed parameter space is excluded for a Z' boson with a mass $ \leq $ 500 GeV while the constraints are less stringent for higher Z' mass hypotheses.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 10 (2023) 043. The superseded preliminary plots can be found here.

CMS Publications