We have searched for a light vector boson U , the possible carrier of a “dark force”, with the KLOE detector at the DAΦNE e+e− collider, motivated by astrophysical evidence for the presence of dark matter in the Universe. Using e+e− collisions collected with an integrated luminosity of 239.3 pb −1 , we look for a dimuon mass peak in the reaction e+e−→μ+μ−γ , corresponding to the decay U→μ+μ− . We find no evidence for a U vector boson signal. We set a 90% CL upper limit for the mixing parameter squared between the photon and the U boson of 1.6×10−5 to 8.6×10−7 for the mass region 520<mU<980 MeV .
Babusci, D., Ceradini, F., DI CICCO, A., Loffredo, S., PRADO LONGHI, I. (2014). Search for light vector boson production in e+e− → μ+μ−γ interactions with the KLOE experiment. PHYSICS LETTERS. SECTION B, 736, 459-464 [10.1016/j.physletb.2014.08.005].
Search for light vector boson production in e+e− → μ+μ−γ interactions with the KLOE experiment
CERADINI, Filippo;DI CICCO, ALESSANDRO;LOFFREDO, SALVATORE;PRADO LONGHI, IVAN
2014-01-01
Abstract
We have searched for a light vector boson U , the possible carrier of a “dark force”, with the KLOE detector at the DAΦNE e+e− collider, motivated by astrophysical evidence for the presence of dark matter in the Universe. Using e+e− collisions collected with an integrated luminosity of 239.3 pb −1 , we look for a dimuon mass peak in the reaction e+e−→μ+μ−γ , corresponding to the decay U→μ+μ− . We find no evidence for a U vector boson signal. We set a 90% CL upper limit for the mixing parameter squared between the photon and the U boson of 1.6×10−5 to 8.6×10−7 for the mass region 520I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
