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 ϕ−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 1000MeV was extracted.

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

#### Abstract

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 ϕ−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 1000MeV was extracted.
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Utilizza questo identificativo per citare o creare un link a questo documento: `http://hdl.handle.net/11570/2541428`
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