A study of the K+ → π0e+νγ decay

Eduardo Cortina, A. Kleimenova, Elisa Minucci, S. Padolski, P. Petrov, A. T. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe

91 more authors

V. W. S. Wong, Douglas A. Bryman, J. Fu, Z. Hives, Tomáš Husek, J. Jerhot, Karol Kampf, Michal Zamkovský, B. De Martino, Mathieu Perrin-Terrin, Atakan Tugberk Akmete, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, Letizia Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, ANDREA MAZZOLARI, I. Neri, A. Norton, F. Petrucci, M. Soldani, H. Wahl, L. Bandiera, A. Cotta Ramusino, A. Gianoli, M. Romagnoni, Alexei Sytov, E. Iacopini, G. Latino, M. Lenti, P. Lo Chiatto, Ilaria Panichi, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, M. D’Errico, D. Di Filippo, R. Fiorenza, R. Giordano, P. Massarotti, Marco Mirra, M. Napolitano, I. Rosa, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, Mauro Piccini, F. Costantini, L. Di Lella, N. Doble, M. A. Giorgi, Sergio Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, Franco Spinella, I. Mannelli, G. D’Agostini, Mauro Raggi, A. Biagioni, Paolo Cretaro, G. P. Heath

Journal of High Energy Physics, 2023

Full text Open access: Gold Metadata (CSL-JSON)
DOI 10.1007/jhep09(2023)040
Data confidence 85 high
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Abstract

Abstract A sample of 1.3 × 105K+ → π0e+νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.