Search for A′→μ+μ− Decays
Author(s)
The LHCb Collaboration; Boettcher, Thomas Julian; Craik, Daniel C; Weisser, Constantin; Williams, Michael
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Searches are performed for both prompt-like and long-lived dark photons,
$A'$, produced in proton-proton collisions at a center-of-mass energy of 13
TeV. These searches look for $A'\!\to\!\mu^+\mu^-$ decays using a data sample
corresponding to an integrated luminosity of 5.5/fb collected with the LHCb
detector. Neither search finds evidence for a signal, and 90% confidence-level
exclusion limits are placed on the $\gamma$-$A'$ kinetic-mixing strength. The
prompt-like $A'$ search explores the mass region from near the dimuon threshold
up to 70 GeV, and places the most stringent constraints to date on dark photons
with $214 < m(A') \lesssim 740$ MeV and $10.6 < m(A') \lesssim 30$ GeV. The
search for long-lived $A'\!\to\!\mu^+\mu^-$ decays places world-leading
constraints on low-mass dark photons with lifetimes $\mathcal{O}(1)$ ps.
Date issued
2020-01-31Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society (APS)