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. These searches look for A′ → μ+ μ− decays using a data sample corresponding to an integrated luminosity of 5.5 fb^−1 collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the γ – A′ kinetic mixing strength. The promptlike A′ search explores the mass region from near the dimuon threshold up to 70 GeV and places the most stringent constraints to date on dark photons with 214 < m(A′) ≲ 740 MeV and 10.6 < m(A′) ≲ 30 GeV. The search for long-lived A′ → μ+ μ− decays places world-leading constraints on low-mass dark photons with lifetimes O(1) ps.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Search for A′ → μ+ μ− Decays. PHYSICAL REVIEW LETTERS, 124(4), 1-12 [10.1103/PhysRevLett.124.041801].

Search for A′ → μ+ μ− Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Gioventù, A.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2020

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. These searches look for A′ → μ+ μ− decays using a data sample corresponding to an integrated luminosity of 5.5 fb^−1 collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the γ – A′ kinetic mixing strength. The promptlike A′ search explores the mass region from near the dimuon threshold up to 70 GeV and places the most stringent constraints to date on dark photons with 214 < m(A′) ≲ 740 MeV and 10.6 < m(A′) ≲ 30 GeV. The search for long-lived A′ → μ+ μ− decays places world-leading constraints on low-mass dark photons with lifetimes O(1) ps.
2020
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Search for A′ → μ+ μ− Decays. PHYSICAL REVIEW LETTERS, 124(4), 1-12 [10.1103/PhysRevLett.124.041801].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/720657
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