| Abstract: | Searches are performed for low-mass dimuon resonances, $X$, produced in
proton-proton collisions at a center-of-mass energy of 13 TeV, using a data
sample corresponding to an integrated luminosity of 5.1 fb$^{-1}$ and collected
with the LHCb detector. The $X o mu^+mu^-$ decays can be either prompt-like
or displaced from the proton-proton collision, where in both cases the
requirements placed on the event and the assumptions made about the production
mechanisms are kept as minimal as possible. The prompt-like $X$ searches
explore the mass range from near the dimuon threshold up to 60 GeV, with
nonnegligible $X$ widths considered above 20 GeV. The searches for displaced $X
o mu^+mu^-$ decays consider masses up to 3 GeV. None of the searches finds
evidence for a signal and 90% confidence-level exclusion limits are placed on
the $X o mu^+mu^-$ cross sections, each with minimal model dependence. In
addition, these results are used to place world-leading constraints on
two-Higgs-doublet and hidden-valley scenarios. |
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