Searches for lepton number violating K+ → π−(π0)e+e+ decays

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

Physics Letters B（2022）

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摘要

Searches for lepton number violating K+→π−e+e+ and K+→π−π0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 5.3×10−11 and 8.5×10−10 are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+→π−π0e+e+ decay rate.

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lepton number

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