RT Journal Article
T1 Search for A' -> mu+mu- Decays
A1 Aaij, Roel
A1 Adeva Andany, Bernardo
A1 Alves Junior, Antonio Augusto
A1 Boente García, Óscar
A1 Brea Rodríguez, Alexandre
A1 Casais Vidal, Adrián
A1 Chobanova, Veronika
A1 Cid Vidal, Xabier
A1 Dalseno, Jeremy
A1 Fernández Prieto, Antonio
A1 Gallas Torreira, Abraham
A1 García Plana, Beatriz
A1 Gioventù, Alessandra
A1 Lomba Castro, Julián
A1 Martínez Santos, Diego
A1 Pló Casasús, Máximo
A1 Prouve, Claire
A1 Ramos Pernas, Miguel
A1 Romero Lamas, Marcos
A1 Romero Vidal, Antonio
A1 Saborido Silva, Juan José
A1 Sanmartín Sedes, Brais
A1 Santamarina Ríos, Cibrán
A1 Vázquez Regueiro, Pablo
A1 Zucchelli, Stefano
K1 Dark photons
K1 Hypothetical particle physics models
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′ →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.
PB American Physical Society
YR 2020
FD 2020-01-29
LK https://hdl.handle.net/10347/45349
UL https://hdl.handle.net/10347/45349
LA eng
NO Aaij, R. et al. (2020). Search for A' -> mu+mu- Decays. Physical Review Letters 124, 041801. https://doi.org/10.1103/PhysRevLett.124.041801
NO We acknowledge support from CERN and from the following national agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG, and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland), and OSC (USA). We are indebted to the communities behind the multiple opensource software packages on which we depend. Individual groups or members have received support from AvH Foundation (Germany); EPLANET, Marie Skłodowska- Curie Actions, and ERC (European Union); ANR, Labex P2IO, and OCEVU, and R´egion Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, and the Thousand Talents Program (China); RFBR, RSF, and Yandex LLC (Russia); GVA, XuntaGal, and GENCAT (Spain); the Royal Society and the Leverhulme Trust (United Kingdom).
DS Minerva
RD 25 may 2026