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Andreotti, M; Back, J J; Barter, W; Belloli, N; Belyaev, I; Bertholet, E; Betti, F; Bezshyiko, Ia; Birnkraut, A; Bjørn, M; Borghi, S; Bossu, F; Bowen, E; Byczynski, W; Camboni, A; Carson, L; Cenci, R; Chrzaszcz, M; Closier, J; Cogneras, E; Da Cunha Marinho, F; Dalseno, J; De Capua, S; Dendek, A; Fernandez Prieto, A; Fleuret, F; Gambetta, S; García Pardiñas, J; Gaspar, C; Gianì, S; Graziani, G; Griffith, P; Gushchin, E; Hancock, T H; van Herwijnen, E; Karodia, S; Kecke, M; Kelsey, M; Klaver, S; Kress, F; Kucewicz, W; Likhomanenko, T; Lupton, O; Mackowiak, P; Malecki, B; Malinin, A; Maratas, J; Marin Benito, C; Martin, M; Mathe, Z; Maurin, B; McNab, A; Meadows, B; Michielin, E; Milanes, D A; Mombächer, T; Monteil, S; Moron, J; Müller, D; Müller, J; Ogilvy, S; Owen, P; Pastore, A; Pearce, A; Pescatore, L; Picatoste Olloqui, E; Pikies, M; Placinta, V; Popov, D; Pullen, H; Qian, W; Dos Reis, A C; Robbe, P; Satriano, C; Schmelling, M; Schmidt, B; Schwemmer, R; Silva de Oliveira, L; Spaan, B; Stefko, P; Storaci, B; Stracka, S; Thomas, E; Tomassetti, L; Tonelli, D; Trisovic, A; Tuning, N; Ustyuzhanin, A; Valat, S; Valenti, G; Veltri, M; Voneki, B; Vorobyev, V; Waldi, R; Watson, N K; Wilkinson, G; Williams, M; Wraight, K; Yang, Z; Yushchenko, O
Physical review letters, 02/2018, Letnik: 120, Številka: 6Journal Article
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.
