First search for K + →π + νν¯ using the decay-in-flight technique

Cortina Gil, E. and Minucci, E. and Padolski, S. and Petrov, P. and Velghe, B. and Georgiev, G. and Kozhuharov, V. and Litov, L. and Numao, T. and Bryman, D. and Fu, J. and Husek, T. and Kampf, K. and Zamkovsky, M. and Aliberti, R. and Khoriauli, G. and Kunze, J. and Lomidze, D. and Marchevski, R. and Peruzzo, L. and Vormstein, M. and Wanke, R. and Dalpiaz, P. and Fiorini, M. and Gamberini, E. and Neri, I. and Norton, A. and Petrucci, F. and Wahl, H. and Cotta Ramusino, A. and Gianoli, A. and Iacopini, E. and Latino, G. and Lenti, M. and Bizzeti, A. and Bucci, F. and Volpe, R. and Antonelli, A. and Lamanna, G. and Lanfranchi, G. and Mannocchi, G. and Martellotti, S. and Moulson, M. and Raggi, M. and Spadaro, T. and Ambrosino, F. and Capussela, T. and Corvino, M. and Dainton, J. B. and Ruggiero, G. (2019) First search for K + →π + νν¯ using the decay-in-flight technique. Physics Letters B, 791. pp. 156-166. ISSN 0370-2693

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The NA62 experiment at the CERN SPS reports the first search for K + →π + νν¯ using the decay-in-flight technique, based on a sample of 1.21×10 11 K + decays collected in 2016. The single event sensitivity is 3.15×10 −10 , corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10 −10 on the K + →π + νν¯ branching ratio at 95% CL.

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Journal Article
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Physics Letters B
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27 Mar 2019 08:45
Last Modified:
16 Sep 2020 05:22