Journal Article

Search for a feebly interacting particle X in the decay K+ → π+X

Martellotti, S., Ceccucci, A., Doble, N., Kudenko, Y., Guida, R., Coward, D., Lehmann Miotto, G., Kampf, K., Wanke, R., Döbrich, B., Lanfranchi, G., Obraztsov, V., Emelyanov, D., Soldi, D., Newson, F., Duval, F., Federici, L., Kleimenova, A., Kekelidze, V., Mirra, M., Saracino, G., Sozzi, M., Potrebenikov, Yu, Bache, T., Biino, C., Korotkova, A., Cortina Gil, E., Bonaiuto, V., Carmignani, J., Santoni, C., Leonardi, E., Husek, T., Holzer, E. B., Lurkin, N., Swallow, J., Brunetti, M. B., Massarotti, P., Polenkevich, I., Pepe, M., Lubrano, P., Goudzovski, E., Velghe, B., Fucci, A., Parkinson, C., Filippi, A., Cotta Ramusino, A., Numao, T., Lamanna, G., Blazek, T., Baeva, A., Zinchenko, A., Khoriauli, G., Molokanova, N., Movchan, S., Romano, A., Litov, L., Conovaloff, A., Perrin-Terrin, M., Sugonyaev, V., Sergi, A., Fedotov, S., Khotyantsev, A., Vicini, P., Boretto, M., Biagioni, A., Bragadireanu, A. M., Hutchcroft, D., Napolitano, M., Anzivino, G., Pedreschi, E., Minucci, E., Norton, A., Palladino, V., Marchetto, F., Hutanu, O. E., Maurice, E., Ryjov, V., Page, R., Piandani, R., Imbergamo, E., Koval, M., Menichetti, E., Kunze, J., Padolski, S., Brizioli

2021

Overview

A bstract A search for the K + → π + X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K + → π + ν ν ¯ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV /c 2 and 154–260 MeV /c 2 , and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR( K + → π + X ), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V,Springer Berlin,SpringerOpen
• Subject: Beyond Standard Model / Charged particles / Classical and Quantum Gravitation / Collaboration / Elementary Particles / Exotics / Experiments / Fixed target experiments / Fysik / High energy physics / Natural Sciences / Naturvetenskap / Particle decay / Physical Sciences / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Regular Article - Experimental Physics / Relativity Theory / Sensors / String Theory / Subatomic Physics / Subatomär fysik / Symmetry / Synchrotrons