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A sample of 1.3 x 10^(5) 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.
Jan Steggemann, Konstantin Androsov, Anna Mascellani, Joanna Malgorzata Wanczyk
Olivier Schneider, Aurelio Bay, Guido Haefeli, Tatsuya Nakada, Frédéric Blanc, Lesya Shchutska, Elena Graverini, Marie Theres Christin Bachmayer, Sebastian Schulte, Aravindhan Venkateswaran, Yunxuan Song, Luis Miguel Garcia Martin, Vitalii Lisovskyi, Sonia Amina Bouchiba, Federico Ronchetti, Anni Matilda Kauniskangas, Raphaël van Laak, Ettore Zaffaroni, Pierre Paul Louis Mayencourt, Arnaud Merlin Gauthey, Gianluca Zunica, Abdul-Kerim Guseinov, Esteban Curras Rivera, Radoslav Marchevski, Roberto Ribatti, Alexandre Brea Rodriguez, Dimitrios Kaminaris, Maria Carolina Feliciano Faria, Rita De Sousa Ataíde Da Silva, Louis André Marie Jean Henry, Spencer Edward Collaviti