New Physics Implications of Recent Search for K L → π 0 ν ν ¯ at KOTO

Kitahara, Teppei; Okui, Takemichi; Perez, Gilad; Soreq, Yotam; Tobioka, Kohsaku

doi:10.1103/PhysRevLett.124.071801

Title: New Physics Implications of Recent Search for $K_{L} \to π^{0} ν \bar{ν}$ at KOTO

Journal Article · Wed Feb 19 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.071801· OSTI ID:1601051

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; Perez, Gilad;

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The KOTO experiment recently reported four candidate events in the signal region of KL → π0νν¯ 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¯” 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 Kþ → πþνν¯ decay, bounded by data from the E949 and the NA62 experiments.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); Israel Science Foundation; United-States-Israel Binational Science Foundation (BSF); Israel Planning and Budgeting Committee; Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0010102; 720/15; 2014397; 1937/12; 19K14706

OSTI ID:: 1601051

Alternate ID(s):: OSTI ID: 1601240; OSTI ID: 1674939

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 124 Journal Issue: 7; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 50 works

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