TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanchez Mayordomo, C.
PY  - 2020
DA  - 2020//
TI  - Search for A ' -> mu(+)mu(-) Decays
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 041801
EP  - 12pp
VL  - 124
IS  - 4
PB  - Amer Physical Soc
AB  - 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 '->mu(+)mu(-) 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 gamma-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 ') less than or similar to 740 MeV and 10.6 < m(A ') less than or similar to 30 GeV. The search for long-lived A '->mu(+)mu(-) decays places world-leading constraints on low-mass dark photons with lifetimes O(1)ps.
SN  - 0031-9007
UR  - https://arxiv.org/abs/1910.06926
UR  - https://doi.org/10.1103/PhysRevLett.124.041801
DO  - 10.1103/PhysRevLett.124.041801
LA  - English
N1  - WOS:000510176700003
ID  - LHCbCollaborationAaij_etal2020
ER  -