2020
DOI: 10.1007/jhep10(2020)047
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Upper limit on the η → π+π− branching fraction with the KLOE experiment

Abstract: Based on an integrated luminosity of 1.61 fb−1e+e− collision data collected with the KLOE detector at DAΦNE, the Frascati ϕ-factory, a search for the P- and CP-violating decay η → π+π− has been performed. Radiative ϕ → ηγ decay is exploited to access the η mesons. No signal is observed in the π+π− invariant mass spectrum, and the upper limit on the branching fraction at 90% confidence level is determined to be ℬ(η → π+π−) < 4.9 × 10−6, which is approximately three times smaller than the previous KLOE result… Show more

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Cited by 3 publications
(7 citation statements)
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“…This sample has been combined with the one of the previous KLOE analysis [6] giving: Br ( → + − ) < 4.4 × 10 −6 . Considering instead the full KLOE-KLOE-2 statistics the expected UL on the branching fraction is: Br ( → + − ) < 2.7 × 10 −6 at 90% CL [2].…”
Section: Pos(ichep2020)459mentioning
confidence: 99%
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“…This sample has been combined with the one of the previous KLOE analysis [6] giving: Br ( → + − ) < 4.4 × 10 −6 . Considering instead the full KLOE-KLOE-2 statistics the expected UL on the branching fraction is: Br ( → + − ) < 2.7 × 10 −6 at 90% CL [2].…”
Section: Pos(ichep2020)459mentioning
confidence: 99%
“…A branching fraction of 1.2 × 10 −15 is foreseen allowing additional CP violation phases in the extended Higgs sector. The observation of a branching fraction larger than the above mentioned would be a signal of new sources of CP violation and could be useful to clarify the origin of the observed baryon asymmetry in the Universe (BAU) [2]. The best upper limit (UL) on this branching ratio has been published by the KLOE collaboration analyzing a data set of 350 pb −1 , Br( → + − ) < 1.3 × 10 −5 at 90% confidence level (CL) [6].…”
Section: Upper Limit On the → + − Branching Fractionmentioning
confidence: 99%
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