Searches for lepton number violating $K^+$ decays

Cortina Gil, E. et al. (2019) Searches for lepton number violating $K^+$ decays. Physics Letters B, 797, 134794. (doi: 10.1016/j.physletb.2019.07.041)

Abstract

The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

• Item Type: Articles
• Additional Information: The NA62 Collaboration.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Protopopescu, Dr Dan and Britton, Professor David and Graham, Connor
• Authors: Cortina Gil, E., Velghe, B., Bryman, D., Husek, T., Kampf, K., Marchevski, R., Wanke, R., Cotta Ramusino, A., Fiorini, M., Gamberini, E., Gianoli, A., Neri, I., Petrucci, F., Bizzeti, A., Bucci, F., Iacopini, E., Latino, G., Lenti, M., Parenti, A., Volpe, R., Antonelli, A., Gonnella, F., Lamanna, G., Lanfranchi, G., David Moulson, M., Kozhuharov, V., Raggi, M., Spadaro, T., Ambrosino, F., Corvino, M., Di Filippo, D., Massarotti, P., Mirra, M., Napolitano, M., Saracino, G., Anzivino, G., Lollini, R., Santoni, C., Barbanera, M., Cenci, P., checcucci, b., Duk, V., Lupi, M., Pepe, M., Piccini, M., lubrano, p., Costantini, F., GIORGI, M., Giudici, S., Pinzino, J., Pontisso, L., Sozzi, M., Di Lella, L., mannelli, i., Fantechi, R., Pedreschi, E., piandani, r., Spinella, F., Biagioni, A., D'Agostini, G., Leonardi, E., Lonardo, A., Valente, P., Vicini, P., Ammendola, R., Bonaiuto, V., Federici, L., Salamon, A., Sargeni, F., Arcidiacono, R., Biino, C., Bloch-Devaux, B., Boretto, M., Filippi, A., Pietro Marchetto, F., Menichetti, E., Migliore, E., Soldi, D., Engelfried, J., Patricia Estrada Tristan, N., Zinchenko, A., Gushchin, E., Shaikhiev, A., Bician, L., Cerny, V., Koval, M., Kucerova, Z., Ceccucci, A., Bernhard, J., Döbrich, B., Gatignon, L., Laycock, P., Mapelli, A., Perrin-Terrin, M., Ruggiero, G., Goudzovski, E., Lurkin, N., Sergi, A., Heath, H., Britton, D., Protopopescu, D., Graham, C., Jones, R., Fry, J., Massri, K., Coward, D., and Rubin, P.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physics Letters B
• Publisher: Elsevier
• ISSN: 0370-2693
• ISSN (Online): 1873-2445
• Published Online: 23 July 2019
• Copyright Holders: Copyright © 2019 The Authors
• First Published: First published in Physics Letters B 797:134794
• Publisher Policy: Reproduced under a Creative Commons License