Search for A^{'}→μ^{+}μ^{-} Decays

LHCb Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review


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. These searches look for A^{'}→μ^{+}μ^{-} decays using a data sample corresponding to an integrated luminosity of 5.5  fb^{-1} collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the γ-A^{'} kinetic mixing strength. The promptlike A^{'} 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 214<m(A^{'})≲740  MeV and 10.6<m(A^{'})≲30  GeV. The search for long-lived A^{'}→μ^{+}μ^{-} decays places world-leading constraints on low-mass dark photons with lifetimes O(1)  ps.

Original languageEnglish
Article number041801
Pages (from-to)1-12
Number of pages12
JournalPhysical review letters
Issue number4
Early online date29 Jan 2020
Publication statusPublished - 31 Jan 2020


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