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Following recent puzzling astrophysical results and recent theoretical studies, a search for a relatively low mass (1 GeV) new vector gauge boson (called the U boson) was performed by means of the KLOE detector. Investigations were carried out using the Initial State Radiation and searching for the signal from the U boson in the e+ + e− → μ+μ−γ process. The KLOE experiment, at the -factory DAΦNE (INFN-LNF), is the first to have exploited ISR to precisely determine cross sections of e+ + e− → π+π−γ(γ) and e+ + e− → μ+μ−γ(γ) processes below 1 GeV. Investigations were based on the data sample collected in 2002, which corresponds to integrated luminosity of 239.29 pb−1. No evidence was found and a preliminary upper limit in the mass range between 600 and 1000 MeV was extracted.

U boson search in the e++ e−→μ+μ−γprocess

U boson search in the e⁺+ e⁻→μ⁺μ⁻γprocess