Abstract

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.

Details

Title
Measurement of the KS→ πeν branching fraction with the KLOE experiment
Author
Babusci, D. 1 ; Berlowski, M. 2 ; Bloise, C. 1 ; Bossi, F. 1 ; Branchini, P. 3 ; Cao, B. 4 ; Ceradini, F. 5 ; Ciambrone, P. 1 ; Curciarello, F. 6 ; Czerwiński, E. 7 ; D’Agostini, G. 8 ; D’Amico, R. 8 ; Danè, E. 1 ; De Leo, V. 8 ; De Lucia, E. 1 ; De Santis, A. 1 ; De Simone, P. 1 ; Di Cicco, A. 1 ; Di Domenico, A. 8 ; Diociaiuti, E. 1 ; Domenici, D. 1 ; D’Uffizi, A. 1 ; Fantini, G. 8 ; Gajos, A. 7 ; Gamrat, S. 7 ; Gauzzi, P. 8 ; Giovannella, S. 1 ; Graziani, E. 3 ; Kang, X. 9 ; Kupsc, A. 10 ; Mandaglio, G. 11 ; Martini, M. 12 ; Miscetti, S. 1 ; Moskal, P. 7 ; Passeri, A. 3 ; Perez del Rio, E. 7 ; Schioppa, M. 6 ; Selce, A. 13 ; Silarski, M. 7 ; Sirghi, F. 14 ; Solodov, E. P. 15 ; Wiślicki, W. 2 ; Wolke, M. 4 

1  Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000 0004 0648 0236) 
2  National Centre for Nuclear Research, Warsaw, Poland (GRID:grid.450295.f) (ISNI:0000 0001 0941 0848) 
3  INFN Sezione di Roma Tre, Roma, Italy (GRID:grid.470220.3) 
4  Uppsala University, Department of Physics and Astronomy, Uppsala, Sweden (GRID:grid.8993.b) (ISNI:0000 0004 1936 9457) 
5  Dipartimento di Matematica e Fisica dell’Università Roma Tre, Roma, Italy (GRID:grid.8993.b); INFN Sezione di Roma Tre, Roma, Italy (GRID:grid.470220.3) 
6  Dipartimento di Fisica dell’Università della Calabria, Arcavacata di Rende, Italy (GRID:grid.7778.f) (ISNI:0000 0004 1937 0319); INFN Gruppo collegato di Cosenza, Arcavacata di Rende, Italy (GRID:grid.6045.7) (ISNI:0000 0004 1757 5281) 
7  Jagiellonian University, Institute of Physics, Cracow, Poland (GRID:grid.5522.0) (ISNI:0000 0001 2162 9631) 
8  Dipartimento di Fisica dell’Università Sapienza, Roma, Italy (GRID:grid.7841.a); INFN Sezione di Roma, Roma, Italy (GRID:grid.470218.8) 
9  China University of Geosciences, School of Mathematics and Physics, Wuhan, China (GRID:grid.503241.1) (ISNI:0000 0004 1760 9015) 
10  Uppsala University, Department of Physics and Astronomy, Uppsala, Sweden (GRID:grid.8993.b) (ISNI:0000 0004 1936 9457); National Centre for Nuclear Research, Warsaw, Poland (GRID:grid.450295.f) (ISNI:0000 0001 0941 0848) 
11  Università di Messina, Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Messina, Italy (GRID:grid.10438.3e) (ISNI:0000 0001 2178 8421); INFN Sezione di Catania, Catania, Italy (GRID:grid.470198.3) (ISNI:0000 0004 1755 400X) 
12  Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000 0004 0648 0236); Università Guglielmo Marconi, Dipartimento di Scienze e Tecnologie applicate, Roma, Italy (GRID:grid.440899.8) (ISNI:0000 0004 1780 761X) 
13  Dipartimento di Matematica e Fisica dell’Università Roma Tre, Roma, Italy (GRID:grid.6045.7); INFN Sezione di Roma Tre, Roma, Italy (GRID:grid.470220.3) 
14  Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000 0004 0648 0236); Horia Hulubei National Institute of Physics and Nuclear Engineering, Măgurele, Romania (GRID:grid.443874.8) (ISNI:0000 0000 9463 5349) 
15  Budker Institute of Nuclear Physics, Novosibirsk, Russia (GRID:grid.418495.5) (ISNI:0000 0001 0790 5468); Novosibirsk State University, Novosibirsk, Russia (GRID:grid.4605.7) (ISNI:0000000121896553) 
Pages
98
Publication year
2023
Publication date
Feb 2023
Publisher
Springer Nature B.V.
e-ISSN
10298479
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1007/JHEP02(2023)098
ProQuest document ID
2775865085
Copyright
© The Author(s) 2023. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.