Search for Dark Photons Produced in 13 TeV pp Collisions
Name
PhysRevLett.120.061801.pdf
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932.15 KB
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
February 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R. et al. "Search for Dark Photons Produced in 13 TeV pp Collisions." Physical Review Letters 120, 6 (February 2018): 061801 © 2018 CERN, for the LHCb Collaboration
Version
Final published version
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 A′→μ⁺μ⁻ decays and a data sample corresponding to an integrated luminosity of 1.6 fb⁻¹ 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′) < 350 MeV. No evidence for a signal is found, and 90% confidence level exclusion limits are placed on the γ–A′ kinetic-mixing strength. The constraints placed on promptlike dark photons are the most stringent to date for the mass range 10.6 < m(A′) < 70 GeV, and are comparable to the best existing limits for m(A′) < 0.5 GeV. The search for long-lived dark photons is the first to achieve sensitivity using a displaced-vertex signature.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.120.061801
