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Title: Search for Dark Photons Produced in 13 TeV pp Collisions
Author: Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
LHCb Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 8-Feb-2018
Publisher: American Physical Society
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.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2018, vol. 120, num. 6, p. 061801
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Electrònica)

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