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. 2021 Sep 24;127(13):131802.
doi: 10.1103/PhysRevLett.127.131802.

Search for Lepton Number and Flavor Violation in K^{+} and π^{0} Decays

R Aliberti  1 F Ambrosino  2 R Ammendola  3 B Angelucci  4 A Antonelli  5 G Anzivino  6 R Arcidiacono  7 T Bache  8 A Baeva  9 D Baigarashev  9 M Barbanera  10 J Bernhard  11 A Biagioni  12 L Bician  13 C Biino  14 A Bizzeti  15 T Blazek  13 B Bloch-Devaux  7 V Bonaiuto  3 M Boretto  7 A M Bragadireanu  16 D Britton  4 F Brizioli  6 M B Brunetti  8 D Bryman  17 F Bucci  15 T Capussela  2 J Carmignani  18 A Ceccucci  11 P Cenci  10 V Cerny  13 C Cerri  19 B Checcucci  10 A Conovaloff  20 P Cooper  20 E Cortina Gil  21 M Corvino  2 F Costantini  22 A Cotta Ramusino  23 D Coward  20 G D'Agostini  24 J B Dainton  18 P Dalpiaz  25 H Danielsson  11 N De Simone  11 D Di Filippo  2 L Di Lella  22 N Doble  22 V Duk  8 F Duval  11 B Döbrich  11 D Emelyanov  9 J Engelfried  26 T Enik  9 N Estrada-Tristan  26 V Falaleev  9 R Fantechi  19 V Fascianelli  8 L Federici  11 S Fedotov  27 A Filippi  14 M Fiorini  25 J R Fry  8 J Fu  17 A Fucci  3 L Fulton  28 E Gamberini  11 L Gatignon  11 G Georgiev  5 S A Ghinescu  16 A Gianoli  23 M Giorgi  22 S Giudici  22 F Gonnella  8 E Goudzovski  8 C Graham  4 R Guida  11 E Gushchin  27 F Hahn  11 H Heath  29 J Henshaw  8 E B Holzer  11 T Husek  30 O E Hutanu  16 D Hutchcroft  28 L Iacobuzio  8 E Iacopini  31 E Imbergamo  6 B Jenninger  11 J Jerhot  30 R W L Jones  18 K Kampf  30 V Kekelidze  9 S Kholodenko  32 G Khoriauli  1 A Khotyantsev  27 A Kleimenova  21 A Korotkova  9 M Koval  11 V Kozhuharov  5 Z Kucerova  13 Y Kudenko  27 J Kunze  1 V Kurochka  27 V Kurshetsov  32 G Lamanna  22 G Lanfranchi  5 E Lari  22 G Latino  31 P Laycock  11 C Lazzeroni  8 G Lehmann Miotto  11 M Lenti  31 E Leonardi  12 P Lichard  11 L Litov  9 R Lollini  6 D Lomidze  1 A Lonardo  12 P Lubrano  10 M Lupi  10 N Lurkin  8 D Madigozhin  9 I Mannelli  33 A Mapelli  11 F Marchetto  14 R Marchevski  11 S Martellotti  5 P Massarotti  2 K Massri  11 E Maurice  28 M Medvedeva  27 A Mefodev  27 E Menichetti  7 E Migliore  7 E Minucci  21 M Mirra  2 M Misheva  9 N Molokanova  9 M Moulson  5 S Movchan  9 M Napolitano  2 I Neri  25 F Newson  8 A Norton  25 M Noy  11 T Numao  34 V Obraztsov  32 A Ostankov  32 S Padolski  21 R Page  29 V Palladino  11 A Parenti  31 C Parkinson  8 E Pedreschi  22 M Pepe  10 M Perrin-Terrin  11 L Peruzzo  1 P Petrov  21 Y Petrov  34 F Petrucci  25 R Piandani  6 M Piccini  10 J Pinzino  11 I Polenkevich  9 L Pontisso  19 Yu Potrebenikov  9 D Protopopescu  4 M Raggi  24 A Romano  8 P Rubin  20 G Ruggiero  18 V Ryjov  11 A Salamon  3 C Santoni  6 G Saracino  2 F Sargeni  3 S Schuchmann  11 V Semenov  32 A Sergi  8 A Shaikhiev  21 S Shkarovskiy  9 D Soldi  7 M Sozzi  22 T Spadaro  5 F Spinella  19 A Sturgess  8 V Sugonyaev  32 J Swallow  8 S Trilov  29 P Valente  12 B Velghe  34 S Venditti  11 P Vicini  12 R Volpe  21 M Vormstein  1 H Wahl  25 R Wanke  1 B Wrona  28 O Yushchenko  32 M Zamkovsky  30 A Zinchenko  9 NA62 Collaboration
Affiliations
Free article

Search for Lepton Number and Flavor Violation in K^{+} and π^{0} Decays

R Aliberti et al. Phys Rev Lett. .
Free article

Abstract

Searches for the lepton number violating K^{+}→π^{-}μ^{+}e^{+} decay and the lepton flavor violating K^{+}→π^{+}μ^{-}e^{+} and π^{0}→μ^{-}e^{+} decays are reported using data collected by the NA62 experiment at CERN in 2017-2018. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level: B(K^{+}→π^{-}μ^{+}e^{+})<4.2×10^{-11}, B(K^{+}→π^{+}μ^{-}e^{+})<6.6×10^{-11} and B(π^{0}→μ^{-}e^{+})<3.2×10^{-10}. These results improve by 1 order of magnitude over previous results for these decay modes.

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