A search for the K+ → μ−νe+e+ decay

Eduardo Cortina Gil ,F Newson,N Lurkin,M Corvino,B Velghe,E Leonardi,R Marchevski,L Di Lella,P Petrov,A Lonardo,V Obraztsov,A Zinchenko,G Saracino,A Ceccucci,C Biino,D Coward,M Fiorini,T Spadaro,R Guida,A Bizzeti,M Raggi,Yu Potrebenikov,A Conovaloff,P Rubin,D Emelyanov,L Pontisso,S Fedotov,R Aliberti,E Iacopini,M Lenti,V Palladino,C Santoni,C Graham,G Latino,R Piandani,A Mefodev,E Pedreschi,P Vicini,L Gatignon,M Piccini,G Georgiev,A Mapelli,A Salamon,S Movchan,V Kurochka,E Gamberini,B Jenninger,G Khoriauli,V Kekelidze,V Kozhuharov,J Kunze,D Britton,Y Petrov,P Cenci,M Barbanera,A Sergi,J Pinzino,L Federici,D Di Filippo,E Migliore,G Anzivino,O Yushchenko,M Napolitano,L Bician,M Noy,L Fulton,D Madigozhin,S Shkarovskiy,D Bryman,R Fantechi,A Sturgess,G Tinti,A Biagioni,S Padolski,B Bloch-Devaux,L Iacobuzio,A Kleimenova,V Falaleev,F Costantini,R Lollini,G Lanfranchi,D Hutchcroft,P Lubrano,A Tomczak,T Enik,A Korotkova,J Engelfried,S Kholodenko,T Capussela,N Molokanova,B Wrona,M Zamkovsky,N De Simone,G Lamanna,A Shaikhiev,F Bucci,A Filippi,D Lomidze,P Dalpiaz,P Laycock,C Cerri,F Gonnella,T Husek,L Peruzzo,P Lichard,H Wahl,A Norton,N Doble,S Schuchmann,R Fiorenza,F Hahn,M Lupi,S Giudici,B Checcucci,Y Kudenko,E Maurice,V Fascianelli,N Estrada-Tristan,M Moulson,M Sozzi,S Venditti,M Koval,R Volpe,P Valente,T Numao,V Ryjov,E Menichetti,J Bernhard,A Gianoli,R Arcidiacono,M Vormstein,Ottorino Frezza ,J R Fry ,V.p Sugonyaev ,P S Cooper ,Matteo Turisini ,Jack Henshaw ,Karim Massri ,Joel Swallow ,C J Parkinson ,Ovidiu Emanuel Hutanu ,Stoyan Miroslavov Trilov ,Babette Döbrich ,T Blažek ,H O Danielsson ,Francesco Brizioli ,M Pepé ,V Černý ,Z Kučerová ,Joseph Carmignani ,A M Bragadireanu ,G D’agostini ,Maria Brigida Brunetti ,Aigul Baeva ,Stefan Alexandru Ghinescu ,Jan Jerhot ,V W S Wong ,H F Heath ,J B Dainton ,Enrico Lari ,Ilaria Neri ,Dosbol Baigarashev ,M A Giorgi ,E B Holzer ,Paolo Cretaro ,Karol Kampf ,Roberto Ammendola ,Roger Jones ,R D Page ,V Bonaiuto,J Fu,P Massarotti,A Romano,G Lehmann Miotto,F Ambrosino,E Gushchin,F Sargeni,A Antonelli,E Goudzovski,F Spinella,T Bache,L Litov,M Boretto,F Duval,M Misheva,M Medvedeva,C Lazzeroni,F Petrucci,F Marchetto,A Fucci,V Kurshetsov,A Ostankov,M Mirra,R Wanke,M Perrin-Terrin,E Imbergamo,I Mannelli,V Duk,I Polenkevich,G Ruggiero,E Minucci,A Khotyantsev,A Parenti,B Angelucci,A Cotta Ramusino,S Martellotti,D Protopopescu,V Semenov,D Soldi

doi:10.1016/j.physletb.2023.137679

A search for the K+ → μ−νe+e+ decay

Eduardo Cortina Gil , F Newson + Show 207 more

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https://doi.org/10.1016/j.physletb.2023.137679

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Journal: Physics Letters B	Publication Date: Jan 10, 2023
Citations: 3	License type: cc-by

#NA62 Experiment #Previous Search + Show 8 more

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Abstract

A search for the K+→μ−νe+e+ decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of 8.1×10−11 is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search.

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