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Search for Dark Photons Produced in 13 TeV pp Collisions

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 120, 061801 – Published 8 February 2018
Physics logo See Synopsis: LHC Sees No Dark Photons
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Abstract

Searches are performed for both promptlike and long-lived dark photons, A, produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using Aμ+μ decays and a data sample corresponding to an integrated luminosity of 1.6fb1 collected with the LHCb detector. The promptlike A search covers the mass range from near the dimuon threshold up to 70 GeV, while the long-lived A search is restricted to the low-mass region 214<m(A)<350MeV. No evidence for a signal is found, and 90% confidence level exclusion limits are placed on the γA kinetic-mixing strength. The constraints placed on promptlike dark photons are the most stringent to date for the mass range 10.6<m(A)<70GeV, and are comparable to the best existing limits for m(A)<0.5GeV. The search for long-lived dark photons is the first to achieve sensitivity using a displaced-vertex signature.

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  • Received 15 December 2017
  • Corrected 26 March 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.061801

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.

© 2018 CERN, for the LHCb Collaboration

Physics Subject Headings (PhySH)

Particles & Fields

Corrections

26 March 2018

Correction: The copyright statement contained an error and has been corrected.

Synopsis

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LHC Sees No Dark Photons

Published 8 February 2018

A search for dark photons at the LHC comes up empty but puts new constraints on the strength of the hypothetical particles’ coupling to electromagnetic fields.

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Vol. 120, Iss. 6 — 9 February 2018

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