/ hep-ex CERN-EP-2017-114


Search for Heavy Neutrinos in $K^+ \rightarrow \mu^+ \nu_{\mu}$ Decays


Lazzeroni, Cristina (Birmingham U.) ; Lurkin, Nicolas (Birmingham U.) ; Newson, Francis (Birmingham U.) ; Romano, Angela (Birmingham U.) ; Ceccucci, Augusto (CERN) ; Danielsson, Hans (CERN) ; Falaleev, Valeri (CERN) ; Gatignon, Lau (CERN) ; Goy Lopez, Silvia (CERN) ; Hallgren, Bjorn (CERN) ; Maier, Andrew (CERN) ; Peters, Andreas Joachim (CERN) ; Piccini, Mauro (INFN, Perugia) ; Riedler, Petra (CERN) ; Frabetti, Pierluigi (Dubna, JINR) ; Gersabeck, Evelina Mihova (Dubna, JINR) ; Kekelidze, Vladimir (Dubna, JINR) ; Madigozhin, Dmitry (Dubna, JINR) ; Misheva, Milena (Dubna, JINR) ; Molokanova, Natalia (Dubna, JINR) ; Movchan, Sergei (Dubna, JINR) ; Potrebenikov, Yuri (Dubna, JINR) ; Shkarovskiy, Sergey (Dubna, JINR) ; Zinchenko, Alexander (Dubna, JINR) ; Rubin, Philip David (George Washington U.) ; Baldini, Wander (INFN, Ferrara) ; Cotta Ramusino, Angelo (INFN, Ferrara) ; Dalpiaz, Pietro (INFN, Ferrara) ; Fiorini, Massimiliano (INFN, Ferrara) ; Gianoli, Alberto (INFN, Ferrara) ; Norton, Alan (INFN, Ferrara) ; Petrucci, Ferruccio (INFN, Ferrara) ; Savrié, Mauro (INFN, Ferrara) ; Wahl, Heinrich (INFN, Ferrara) ; Bizzeti, Andrea (INFN, Florence) ; Bucci, Francesca (INFN, Florence) ; Veltri, Michele (INFN, Florence) ; Iacopini, Enrico (INFN, Florence) ; Lenti, Massimo (INFN, Florence) ; Antonelli, Antonella (Frascati) ; Moulson, Matthew (Frascati) ; Raggi, Mauro (Frascati) ; Spadaro, Tommaso (Frascati) ; Eppard, Kirsten (Mainz U., Inst. Phys.) ; Hita-Hochgesand, Manuel (Mainz U., Inst. Phys.) ; Kleinknecht, Konrad (Mainz U., Inst. Phys.) ; Renk, Burkhard (Mainz U., Inst. Phys.) ; Wanke, Rainer (Mainz U., Inst. Phys.) ; Winhart, Andreas (Mainz U., Inst. Phys.) ; Winston, Roland (UC, Merced) ; Bolotov, Vladimir (Moscow, INR) ; Duk, Viacheslav (INFN, Perugia) ; Gushchin, Evgeny (Moscow, INR) ; Ambrosino, Fabio (Naples U.) ; Di Filippo, Domenico (Naples U.) ; Massarotti, Paolo (Naples U.) ; Napolitano, Marco (Naples U.) ; Palladino, Vito (Naples U.) ; Saracino, Giulio (Naples U.) ; Anzivino, Giuseppina (Perugia U.) ; Imbergamo, Ermanno (Perugia U.) ; Piandani, Roberto (INFN, Pisa) ; Sergi, Antonino (Perugia U.) ; Cenci, Patrizia (INFN, Perugia) ; Pepe, Monica (INFN, Perugia) ; Costantini, Flavio (Pisa U.) ; Doble, Niels (Pisa U.) ; Giudici, Sergio (Pisa U.) ; Pierazzini, Giuseppe (Pisa U.) ; Sozzi, Marco (Pisa U.) ; Venditti, Stefano (Pisa U.) ; Balev, Spasimir (Pisa, Scuola Normale Superiore) ; Collazuol, Gianmaria (Pisa, Scuola Normale Superiore) ; Di Lella, Luigi (Pisa, Scuola Normale Superiore) ; Gallorini, Stefano (Pisa, Scuola Normale Superiore) ; Goudzovski, Evgueni (Pisa, Scuola Normale Superiore) ; Lamanna, Gianluca (Pisa U.) ; Mannelli, Italo (Pisa, Scuola Normale Superiore) ; Ruggiero, Giuseppe (Pisa, Scuola Normale Superiore) ; Cerri, Claudio (INFN, Pisa) ; Fantechi, Riccardo (INFN, Pisa) ; Kholodenko, Sergey (Serpukhov, IHEP) ; Kurshetsov, Viktor (Serpukhov, IHEP) ; Obraztsov, Vladimir (Serpukhov, IHEP) ; Semenov, Vitali (Serpukhov, IHEP) ; Yushchenko, Oleg (Serpukhov, IHEP) ; D'Agostini, Giulio (Rome U.) ; Leonardi, Emanuele (INFN, Rome3) ; Serra, Marco (INFN, Rome3) ; Valente, Paolo (INFN, Rome3) ; Fucci, Adolfo (INFN, Rome2) ; Salamon, Andrea (INFN, Rome2) ; Bloch-Devaux, Brigitte (IRFU, Saclay) ; Peyaud, Bernard (IRFU, Saclay) ; Engelfried, Jürgen (San Luis Potosi U.) ; Coward, David (SLAC) ; Kozhuharov, Venelin (Frascati) ; Litov, Leandar (Sofiya U.) ; Arcidiacono, Roberta (Turin U.) ; Bifani, Simone (Turin U.) ; Biino, Cristina (INFN, Turin) ; Dellacasa, Giulio (INFN, Turin) ; Marchetto, Flavio (INFN, Turin) ; Numao, Toshio (TRIUMF) ; Retière, Fabrice (TRIUMF)

Pages: 12

Abstract: The NA62 experiment recorded a large sample of $K^+ \rightarrow \mu^+ \nu_{\mu}$ decays in 2007. A peak search has been performed in the reconstructed missing mass spectrum. In the absence of a signal, limits in the range $2 \times 10^{-6}$ to $10^{-5}$ have been set on the squared mixing matrix element $|U_{\mu4} |^2$ between muon and heavy neutrino states, for heavy neutrino masses in the range 300-375 MeV/$c^2$. The result extends the range of masses for which upper limits have been set on the value of $|U_{\mu4} |^2$ in previous production search experiments.

Web-Page: http://inspirehep.net/record/1600789/files/halo_pz_pre_all_logy.png; http://inspirehep.net/record/1600789/files/halo_zt_pre_all_logy_regions.png; http://inspirehep.net/record/1600789/files/final_acc.png; http://inspirehep.net/record/1600789/files/bgcomp_log.png; http://inspirehep.net/record/1600789/files/stack_m.png; http://inspirehep.net/record/1600789/files/u2.png; http://inspirehep.net/record/1600789/files/br.png; http://inspirehep.net/record/1600789/files/mu.png; http://inspirehep.net/record/1600789/files/sqerr.png; http://inspirehep.net/record/1600789/files/arXiv:1705.07510.pdf


Note: *Temporary entry*; 12 pages, 8 figures. Prepared for publication in Physics Letter B

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