New Physics Implications of Recent Search for K_{L}→π^{0}νν[over ¯] at KOTO

Physical Review Letters
Teppei KitaharaKohsaku Tobioka

Abstract

The KOTO experiment recently reported four candidate events in the signal region of K_{L}→π^{0}νν[over ¯] search, where the standard model only expects 0.10±0.02 events. If confirmed, this requires physics beyond the standard model to enhance the signal. We examine various new physics interpretations of the result including these: (1) heavy new physics boosting the standard model signal, (2) reinterpretation of "νν[over ¯]" as a new light long-lived particle, or (3) reinterpretation of the whole signal as the production of a new light long-lived particle at the fixed target. We study the above explanations in the context of a generalized new physics Grossman-Nir bound coming from the K^{+}→π^{+}νν[over ¯] decay, bounded by data from the E949 and the NA62 experiments.

References

Jun 1, 1989·Physical Review. D·L S Littenberg
Sep 16, 2000·Physical Review Letters·A Alavi-HaratiA Glazov
Aug 25, 2004·Physical Review Letters·A Alavi-HaratiR F Zukanovich
Dec 31, 2008·Physical Review Letters·A V ArtamonovUNKNOWN E949 Collaboration
May 16, 2015·Physical Review Letters·Kaori FuyutoMasaya Kohda
Dec 9, 2017·Physical Review Letters·Giancarlo D'Ambrosio, Teppei Kitahara
Feb 6, 2019·Physical Review Letters·J K AhnUNKNOWN KOTO Collaboration
Aug 7, 2019·Physical Review Letters·Daniel AloniMike Williams
Sep 7, 2019·Physical Review Letters·Daniel AloniMike Williams

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Citations

May 30, 2020·Physical Review Letters·Daniel Egana-UgrinovicPatrick Meade
Jan 8, 2021·Physical Review Letters·Yasuhiro Yamaguchi, Nodoka Yamanaka
Apr 10, 2021·Physical Review Letters·J K AhnUNKNOWN KOTO Collaboration

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