Search for b hadron decays to long-lived particles in the CMS endcap muon detectors

Abstract

A search for long-lived particles originating from the decay of b hadrons produced in proton-proton collisions with a center-of-mass energy of 13 TeV at the LHC is presented. The analysis is performed on a data set recorded in 2018, corresponding to an integrated luminosity of 41.6 fb${}^{-1}$. Interactions of the long-lived particles in the CMS endcap muon system would create hadronic or electromagnetic showers, producing clusters of detector hits. Selected events contain at least one such high-multiplicity cluster in the muon endcaps and require the presence of a displaced muon. The most stringent upper limits to date on the branching fraction $\mathcal{B}$(B $\to$ K$\Phi$), where the long-lived particle $\Phi$ decays to a pair of hadrons, are obtained for $\Phi$ masses of 0.3$-$3.0 GeV and $\Phi$ mean proper decay lengths in the range of 1$-$500 cm.

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-24-004 (CMS Public Pages)

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