TY - JOUR

T1 - Measurement of the KS → πeν branching fraction with the KLOE experiment

AU - Babusci, D.

AU - Berlowski, M.

AU - Bloise, C.

AU - Bossi, F.

AU - Branchini, P.

AU - Cao, B.

AU - Ceradini, F.

AU - Ciambrone, P.

AU - Curciarello, F.

AU - Czerwiński, E.

AU - D’Agostini, G.

AU - D’Amico, R.

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 - Diociaiuti, E.

AU - Domenici, D.

AU - D’Uffizi, A.

AU - Fantini, G.

AU - Gajos, A.

AU - Gamrat, S.

AU - Gauzzi, P.

AU - Giovannella, S.

AU - Graziani, E.

AU - Kang, X.

AU - Kupsc, A.

AU - Mandaglio, G.

AU - Martini, M.

AU - Miscetti, S.

AU - Moskal, P.

AU - Passeri, A.

AU - Perez del Rio, E.

AU - Schioppa, M.

AU - Selce, A.

AU - Silarski, M.

AU - Sirghi, F.

AU - Solodov, E. P.

AU - Wiślicki, W.

AU - Wolke, M.

N1 - We warmly thank our former KLOE colleagues for the access to the data collected during the KLOE data taking campaign. We thank the DAΦNE team for their efforts in maintaining good running conditions and their collaboration during both the KLOE run and the KLOE-2 data taking with an upgraded collision scheme [23, 24]. We are very grateful to our colleague G. Capon for his enlightening comments and suggestions about the manuscript. We want to thank our technical staff: G.F. Fortugno and F. Sborzacchi for their dedication in ensuring efficient operation of the KLOE computing facilities; M. Anelli for his continuous attention to the gas system and detector safety; A. Balla, M. Gatta, G. Corradi and G. Papalino for electronics maintenance; C. Piscitelli for his help during major maintenance periods. This work was supported in part by the Polish National Science Centre through the Grants No. 2014/14/E/ST2/00262, 2016/21/N/ST2/01727, 2017/26/M/ST2/00697. Публикация для корректировки.

PY - 2023/2

Y1 - 2023/2

N2 - The ratio R = Γ(KS→ πeν)/Γ(KS→ π+π−) has been measured with a sample of 300 million KS mesons produced in ϕ → KLKS decays recorded by the KLOE experiment at the DAΦNE e+e− collider. KS→ πeν events are selected by a boosted decision tree built with kinematic variables and time-of-flight measurements. Data control samples of KL→ πeν decays are used to evaluate signal selection efficiencies. With 49647±316 signal events we measure R = (1.0421 ± 0.0066stat± 0.0075syst) × 10−3. The combination with our previous measurement gives R = (1.0338 ± 0.0054stat± 0.0064syst) × 10−3. From this value we derive the branching fraction B(KS→ πeν) = (7.153 ± 0.037stat± 0.044syst) × 10−4 and f+(0)|Vus| = 0.2170 ± 0.009.

AB - The ratio R = Γ(KS→ πeν)/Γ(KS→ π+π−) has been measured with a sample of 300 million KS mesons produced in ϕ → KLKS decays recorded by the KLOE experiment at the DAΦNE e+e− collider. KS→ πeν events are selected by a boosted decision tree built with kinematic variables and time-of-flight measurements. Data control samples of KL→ πeν decays are used to evaluate signal selection efficiencies. With 49647±316 signal events we measure R = (1.0421 ± 0.0066stat± 0.0075syst) × 10−3. The combination with our previous measurement gives R = (1.0338 ± 0.0054stat± 0.0064syst) × 10−3. From this value we derive the branching fraction B(KS→ πeν) = (7.153 ± 0.037stat± 0.044syst) × 10−4 and f+(0)|Vus| = 0.2170 ± 0.009.

KW - Branching fraction

KW - Flavour Physics

KW - e+-e− Experiments

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85148505040&origin=inward&txGid=f09f123b6e5e3dabdf4dac97b985e99b

UR - https://www.mendeley.com/catalogue/fca8a1b8-07ad-3951-b58f-7666f5e08e37/

U2 - 10.1007/JHEP02(2023)098

DO - 10.1007/JHEP02(2023)098

M3 - Article

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 2

M1 - 98

ER -