Search for Dark Photons Produced in 13 TeV pp Collisions

R. Aaij*, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. AndreottiJ. E. Andrews, R. B. Appleby, F. Archilli, P. D'Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, M. Atzeni, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, V. Balagura, W. Baldini, S. Bifani, R. Calladine, G. Chatzikonstantinidis, N. Farley, Philip Ilten, C. Lazzeroni, A. Mazurov, A. Sergi, N. K. Watson, M. P. Williams, K. A. Zarebski, Timothy Williams, LHCb Collaboration

*Corresponding author for this work

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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 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.

Original languageEnglish
Article number061801
JournalPhysical Review Letters
Volume120
Issue number6
DOIs
Publication statusPublished - 8 Feb 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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