Author:
,Babusci D.,Berlowski M.,Bloise C.,Bossi F.,Branchini P.,Budano A.,Cao B.,Ceradini F.,Ciambrone P.,Curciarello F.,Czerwiński E.,D’Agostini G.,Danè E.,De Leo V.,De Lucia E.,De Santis A.,De Simone P.,Di Cicco A.,Di Domenico A.,Domenici D.,D’Uffizi A.,Fantini A.,Fermani P.,Fiore S.,Gajos A.,Gauzzi P.,Giovannella S.,Graziani E.,Ivanov V. L.,Johansson T.,Kang X.,Kisielewska-Kamińska D.,Kozyrev E. A.,Krzemien W.,Kupsc A.,Lukin P. A.,Mandaglio G.,Martini M.,Messi R.,Miscetti S.,Moricciani D.,Moskal P.,Parzych S.,Passeri A.,Patera V.,Perez del Rio E.,Santangelo P.,Schioppa M.,Selce A.,Silarski M.,Sirghi F.,Solodov E. P.,Tortora L.,Venanzoni G.,Wiślicki W.,Wolke M.
Abstract
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. From the combination of these two measurements we get ℬ(η → π+π−) < 4.4 × 10−6 at 90% confidence level.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Cited by
2 articles.
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