Title:
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Search for Dark Photons Produced in 13 TeV pp Collisions
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Author:
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Alfonso Albero, Alejandro; Calvo Gómez, Míriam; Camboni, Alessandro; Coquereau, Samuel; Garrido Beltrán, Lluís; Gascón Fora, David; Graciani Díaz, Ricardo; Graugés Pous, Eugeni; LHCb Collaboration
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Física de partícules -Experiments -Particle physics -Experiments |
Rights:
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cc by (c) CERN; LHCb Collaboration, 2018
http://creativecommons.org/licenses/by/3.0/es/ |
Document type:
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Article Article - Published version |
Published by:
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American Physical Society
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