Search for dark photons produced in 13 TeV $pp$ collisions

Abstract

Searches are performed for both prompt-like and long-lived dark photons, $A^{\prime }$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays and a data sample corresponding to an integrated luminosity of 1.6 fb${}^{-1}$ collected with the LHCb detector. The prompt-like $A^{\prime }$ search covers the mass range from near the dimuon threshold up to 70 GeV, while the long-lived $A^{\prime }$ search is restricted to the low-mass region $214<m(A^{\prime })<350$ MeV. No evidence for a signal is found, and 90% confidence level exclusion limits are placed on the $\gamma$-$A^{\prime }$ kinetic-mixing strength. The constraints placed on prompt-like dark photons are the most stringent to date for the mass range $10.6<m(A^{\prime })<70$ GeV, and are comparable to the best existing limits for $m(A^{\prime })<0.5$ GeV. The search for long-lived dark photons is the first to achieve sensitivity using a displaced-vertex signature.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-038.html

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