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Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 10 (2023) 043. The superseded preliminary plots can be found here.

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