Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Upper limit on the η → π + π − branching fraction with the KLOE experiment. / The KLOE-2 Collaboration.
в: Journal of High Energy Physics, Том 2020, № 10, 47, 01.10.2020.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Upper limit on the η → π + π − branching fraction with the KLOE experiment
AU - The KLOE-2 Collaboration
AU - Babusci, D.
AU - Berlowski, M.
AU - Bloise, C.
AU - Bossi, F.
AU - Branchini, P.
AU - Budano, A.
AU - Cao, B.
AU - Ceradini, F.
AU - Ciambrone, P.
AU - Curciarello, F.
AU - Czerwiński, E.
AU - D’Agostini, G.
AU - Danè, E.
AU - De Leo, V.
AU - De Lucia, E.
AU - De Santis, A.
AU - De Simone, P.
AU - Di Cicco, A.
AU - Di Domenico, A.
AU - Domenici, D.
AU - D’Uffizi, A.
AU - Fantini, A.
AU - Fermani, P.
AU - Fiore, S.
AU - Gajos, A.
AU - Gauzzi, P.
AU - Giovannella, S.
AU - Graziani, E.
AU - Ivanov, V. L.
AU - Johansson, T.
AU - Kang, X.
AU - Kisielewska-Kamińska, D.
AU - Kozyrev, E. A.
AU - Krzemien, W.
AU - Kupsc, A.
AU - Lukin, P. A.
AU - Mandaglio, G.
AU - Martini, M.
AU - Messi, R.
AU - Miscetti, S.
AU - Moricciani, D.
AU - Moskal, P.
AU - Parzych, S.
AU - Passeri, A.
AU - Patera, V.
AU - Perez del Rio, E.
AU - Santangelo, P.
AU - Schioppa, M.
AU - Selce, A.
AU - Solodov, E. P.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - 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.
AB - 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.
KW - Branching fraction
KW - CP violation
KW - e-e Experiments
KW - Rare decay
KW - e(+)-e(-) Experiments
KW - DETECTOR
KW - SEARCHES
KW - DECAYS
KW - CP
UR - http://www.scopus.com/inward/record.url?scp=85092531000&partnerID=8YFLogxK
U2 - 10.1007/JHEP10(2020)047
DO - 10.1007/JHEP10(2020)047
M3 - Article
AN - SCOPUS:85092531000
VL - 2020
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1029-8479
IS - 10
M1 - 47
ER -
ID: 25613011