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Publication - Dr Jaap Velthuis

    Search for Dark Photons Produced in 13 TeV pp Collisions


    Adinolfi, M, Buchanan, E, Chapman, M, Cook, A, Dalseno, J, Harnew, S, Kariuki, J, Maddrell-Mander, S, Naik, P, Petridis, K, Pomery, G, Price, E, Prouve, C, Quagliani, R, Rademacker, J, Richards, S, Saunders, D, Skidmore, N, Velthuis, J & , 2018, ‘Search for Dark Photons Produced in 13 TeV pp Collisions’. Physical Review Letters, vol 120.


    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.

    Full details in the University publications repository