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 vertical bar U-e4 vertical bar(2)and vertical bar U-mu 4 vertical bar(2)for heavy neutral lepton mass in the ranges 170-448MeV c(2) and 250-373MeV/c(2), respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for vertical bar U-e4 vertical bar(2), and above 300MeV/c(2) for vertical bar U-mu 4 vertical bar(2).

Search for heavy neutral lepton production in K+ decays / Cortina Gil, E., Minucci, E., Padolski, S., Petrov, P., Velghe, B., Georgiev, G., Kozhuharov, V., Litov, L., Numao, T., Bryman, D., Fu, J., Husek, T., Kampf, K., Zamkovsky, M., Aliberti, R., Khoriauli, G., Kunze, J., Lomidze, D., Marchevski, R., Peruzzo, L., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 778:(2018), pp. 137-145. [10.1016/j.physletb.2018.01.031]

Search for heavy neutral lepton production in K+ decays

Raggi, M.;D'Agostini, G.;Biagioni, A.;Lonardo, A.;Fascianelli, V.;
2018

Abstract

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 vertical bar U-e4 vertical bar(2)and vertical bar U-mu 4 vertical bar(2)for heavy neutral lepton mass in the ranges 170-448MeV c(2) and 250-373MeV/c(2), respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for vertical bar U-e4 vertical bar(2), and above 300MeV/c(2) for vertical bar U-mu 4 vertical bar(2).
2018
Bounds; neutrinos; masses; tests
01 Pubblicazione su rivista::01a Articolo in rivista
Search for heavy neutral lepton production in K+ decays / Cortina Gil, E., Minucci, E., Padolski, S., Petrov, P., Velghe, B., Georgiev, G., Kozhuharov, V., Litov, L., Numao, T., Bryman, D., Fu, J., Husek, T., Kampf, K., Zamkovsky, M., Aliberti, R., Khoriauli, G., Kunze, J., Lomidze, D., Marchevski, R., Peruzzo, L., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 778:(2018), pp. 137-145. [10.1016/j.physletb.2018.01.031]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1073208
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