Abstract
Searches are performed for both promptlike and long-lived dark photons, , produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for decays using a data sample corresponding to an integrated luminosity of collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the kinetic mixing strength. The promptlike 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 and . The search for long-lived decays places world-leading constraints on low-mass dark photons with lifetimes .
- Received 18 October 2019
- Revised 12 December 2019
DOI:https://doi.org/10.1103/PhysRevLett.124.041801
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
© 2020 CERN, for the LHCb Collaboration