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<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<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.

Search for Dark Photons Produced in 13 TeV pp Collisions

Calabrese, R;Capriotti, L;Fiorini, M;Luppi, E;Minzoni, L;Pappalardo, L;Tomassetti, L;
2018

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<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<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.
2018
Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Alfonso Albero, A; Ali, S; Alkhazov, G; Alvarez Cartelle...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2397002
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