Search for heavy neutral lepton production in K+ decays

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 Gonnella, F. 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 Ruggiero, G. and Dainton, J.B. (2018) Search for heavy neutral lepton production in K+ decays. Physics Letters B, 778. pp. 137-145. ISSN 0370-2693

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A search for heavy neutral lepton production in K + decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the 10 − 7 to 10 − 6 level are established on the elements of the extended neutrino mixing matrix | U e 4 | 2 and | U μ 4 | 2 for heavy neutral lepton mass in the ranges 170–448 MeV/ c 2 and 250–373 MeV/ c 2 , respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for | U e 4 | 2 , and above 300 MeV/ c 2 for | U μ 4 | 2 .

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Journal Article
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Physics Letters B
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07 Feb 2018 10:56
Last Modified:
26 May 2020 06:23