Search for a high-mass dimuon resonance produced in association with b quark jets at $\sqrt{s}$ = 13 TeV

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 signal events with exactly one or more than one b quark jet. Results are also interpreted in a lepton-flavor-universal model with Z${}^{\prime }$ boson couplings to a bb quark pair ($g_{\mathrm{b}}$), an sb quark pair ($g_{\mathrm{b}}{\delta }_{\mathrm{bs}}$), and any same-flavor charged lepton ($g_{\ell }$) or neutrino pair ($g_{\nu }$), with $\left|g_{\nu }\right|=\left|g_{\ell }\right|$. For a Z${}^{\prime }$ boson with a mass $m_{{\mathrm{Z}}^{\prime }}$ = 350 GeV (2 TeV) and $\left|{\delta }_{\mathrm{bs}}\right|$ $<$ 0.25, the majority of the parameter space with 0.0057 $<$ $\left|g_{\ell }\right|$ $<$ 0.35 (0.25 $<$ $\left|g_{\ell }\right|$ $<$ 0.43) and 0.0079 $<$ $\left|g_{\mathrm{b}}\right|$ $<$ 0.46 (0.34 $<$ $\left|g_{\mathrm{b}}\right|$ $<$ 0.57) is excluded at 95% confidence level. Finally, constraints are set on a Z${}^{\prime }$ model with parameters consistent with low-energy b $\to$ s$\ell \ell$ measurements. In this scenario, most of the allowed parameter space is excluded for a Z${}^{\prime }$ boson with 350 $<m_{{\mathrm{Z}}^{\prime }}$ $<$ 500 GeV, while the constraints are less stringent for higher $m_{{\mathrm{Z}}^{\prime }}$ hypotheses. This is the first 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.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-22-016 (CMS Public Pages)

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