Abstract:Abstract. Nowadays the field of searching for a new physics became a very interesting subject in a light meson decays due to a recent results from KTeV collaboration which found the 3.3σ disagreement between Standard Model theory and their results of π • → e + e − branching ratio measurement [1]. They propose to explain this discrepancy with a new U boson particle that interacts both with meson and virtual photon producing e + e − pair [2]. The same effect could be observed in eta meson decay into electron-pos… Show more
“…Concerning the search for the η → e + e − signal the best published experimental upper limit was set by the HADES experiment BR(η → e + e − ) < 5.6×10 −6 at 90% CL 23 . So far the WASAat-COSY collaboration, based on 5% of the collected statistics, has reported a preliminary upper limit of 4.6 × 10 −6 at 90% CL 34 . The analysis of the remaining data sample is in progress.…”
“…Concerning the search for the η → e + e − signal the best published experimental upper limit was set by the HADES experiment BR(η → e + e − ) < 5.6×10 −6 at 90% CL 23 . So far the WASAat-COSY collaboration, based on 5% of the collected statistics, has reported a preliminary upper limit of 4.6 × 10 −6 at 90% CL 34 . The analysis of the remaining data sample is in progress.…”
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