在K⁺和π⁰衰变中寻找轻子数和味违反现象。
Search for Lepton Number and Flavor Violation in K^{+} and π^{0} Decays.
作者信息
Aliberti R, Ambrosino F, Ammendola R, Angelucci B, Antonelli A, Anzivino G, Arcidiacono R, Bache T, Baeva A, Baigarashev D, Barbanera M, Bernhard J, Biagioni A, Bician L, Biino C, Bizzeti A, Blazek T, Bloch-Devaux B, Bonaiuto V, Boretto M, Bragadireanu A M, Britton D, Brizioli F, Brunetti M B, Bryman D, Bucci F, Capussela T, Carmignani J, Ceccucci A, Cenci P, Cerny V, Cerri C, Checcucci B, Conovaloff A, Cooper P, Cortina Gil E, Corvino M, Costantini F, Cotta Ramusino A, Coward D, D'Agostini G, Dainton J B, Dalpiaz P, Danielsson H, De Simone N, Di Filippo D, Di Lella L, Doble N, Duk V, Duval F, Döbrich B, Emelyanov D, Engelfried J, Enik T, Estrada-Tristan N, Falaleev V, Fantechi R, Fascianelli V, Federici L, Fedotov S, Filippi A, Fiorini M, Fry J R, Fu J, Fucci A, Fulton L, Gamberini E, Gatignon L, Georgiev G, Ghinescu S A, Gianoli A, Giorgi M, Giudici S, Gonnella F, Goudzovski E, Graham C, Guida R, Gushchin E, Hahn F, Heath H, Henshaw J, Holzer E B, Husek T, Hutanu O E, Hutchcroft D, Iacobuzio L, Iacopini E, Imbergamo E, Jenninger B, Jerhot J, Jones R W L, Kampf K, Kekelidze V, Kholodenko S, Khoriauli G, Khotyantsev A, Kleimenova A, Korotkova A, Koval M, Kozhuharov V, Kucerova Z, Kudenko Y, Kunze J, Kurochka V, Kurshetsov V, Lamanna G, Lanfranchi G, Lari E, Latino G, Laycock P, Lazzeroni C, Lehmann Miotto G, Lenti M, Leonardi E, Lichard P, Litov L, Lollini R, Lomidze D, Lonardo A, Lubrano P, Lupi M, Lurkin N, Madigozhin D, Mannelli I, Mapelli A, Marchetto F, Marchevski R, Martellotti S, Massarotti P, Massri K, Maurice E, Medvedeva M, Mefodev A, Menichetti E, Migliore E, Minucci E, Mirra M, Misheva M, Molokanova N, Moulson M, Movchan S, Napolitano M, Neri I, Newson F, Norton A, Noy M, Numao T, Obraztsov V, Ostankov A, Padolski S, Page R, Palladino V, Parenti A, Parkinson C, Pedreschi E, Pepe M, Perrin-Terrin M, Peruzzo L, Petrov P, Petrov Y, Petrucci F, Piandani R, Piccini M, Pinzino J, Polenkevich I, Pontisso L, Potrebenikov Yu, Protopopescu D, Raggi M, Romano A, Rubin P, Ruggiero G, Ryjov V, Salamon A, Santoni C, Saracino G, Sargeni F, Schuchmann S, Semenov V, Sergi A, Shaikhiev A, Shkarovskiy S, Soldi D, Sozzi M, Spadaro T, Spinella F, Sturgess A, Sugonyaev V, Swallow J, Trilov S, Valente P, Velghe B, Venditti S, Vicini P, Volpe R, Vormstein M, Wahl H, Wanke R, Wrona B, Yushchenko O, Zamkovsky M, Zinchenko A
机构信息
Institut für Physik and PRISMA Cluster of Excellence, Universität Mainz, D-55099 Mainz, Germany.
Dipartimento di Fisica "Ettore Pancini" e INFN, Sezione di Napoli, I-80126 Napoli, Italy.
出版信息
Phys Rev Lett. 2021 Sep 24;127(13):131802. doi: 10.1103/PhysRevLett.127.131802.
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.
报告了使用欧洲核子研究中心（CERN）的NA62实验在2017 - 2018年收集的数据，对违反轻子数的(K^{+}→π^{-}μ^{+}e^{+})衰变以及违反轻子味的(K^{+}→π^{+}μ^{-}e^{+})和(π^{0}→μ^{-}e^{+})衰变进行的搜索。未发现这些衰变的证据，并在90%置信水平下获得了分支比的上限：(B(K^{+}→π^{-}μ^{+}e^{+})<4.2×10^{-11})，(B(K^{+}→π^{+}μ^{-}e^{+})<6.6×10^{-11})，(B(π^{0}→μ^{-}e^{+})<3.2×10^{-10})。这些结果比这些衰变模式的先前结果提高了1个数量级。
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