The NA62 experiment at CERN, designed to study the ultra-rare decay K+ -> pi(+) nu(nu) over bar, has also collected data in beam-dump mode. In this configuration, dark photons may be produced by protons dumped on an absorber and reach a decay volume beginning 80 m downstream. A search for dark photons decaying in flight to mu(+) mu(-) pairs is reported, based on a sample of 1.4 x 10(17) protons on dump collected in 2021. No evidence for a dark photon signal is observed. A region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon masses between 215 and 550MeV/c(2).
Search for dark photon decays to μ+μ− at NA62
Cortina Gil, E.;Di Lella, L.;Wahl, H.;Dalpiaz, P.;Mazzolari, A.;Neri, I.;Petrucci, F.;Soldani, M.;Bandiera, L.;Cotta Ramusino, A.;Gianoli, A.;Romagnoni, M.;Sytov, A.;Ruggiero, G.;Turisini, M.;Norton, A.;
2023
Abstract
The NA62 experiment at CERN, designed to study the ultra-rare decay K+ -> pi(+) nu(nu) over bar, has also collected data in beam-dump mode. In this configuration, dark photons may be produced by protons dumped on an absorber and reach a decay volume beginning 80 m downstream. A search for dark photons decaying in flight to mu(+) mu(-) pairs is reported, based on a sample of 1.4 x 10(17) protons on dump collected in 2021. No evidence for a dark photon signal is observed. A region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon masses between 215 and 550MeV/c(2).File in questo prodotto:
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