A sample of 1.3 × 105 K + → π 0 e + 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.
A study of the K+ → π0e+νγ decay
Cortina Gil, E.;Dalpiaz, P.;Fiorini, M.;Mazzolari, A.;Neri, I.;Norton, A.;Petrucci, F.;Soldani, M.;Wahl, H.;Bandiera, L.;Cotta Ramusino, A.;Gianoli, A.;Romagnoni, M.;Sytov, A.;Iacopini, E.;Latino, G.;Parenti, A.;Georgiev, G.;Lanfranchi, G.;D'Errico, M.;Giordano, R.;Santoni, C.;Barbanera, M.;Pepe, M.;Di Lella, L.;D'Agostini, G.;Turisini, M.;Valente, P.;Vicini, P.;Menichetti, E.;
2023
Abstract
A sample of 1.3 × 105 K + → π 0 e + 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.File in questo prodotto:
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