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New physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTO
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 resu...
Autores principales: | , , , , |
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Lenguaje: | eng |
Publicado: |
2019
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevLett.124.071801 http://cds.cern.ch/record/2690977 |
_version_ | 1780963799867588608 |
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author | Kitahara, Teppei Okui, Takemichi Perez, Gilad Soreq, Yotam Tobioka, Kohsaku |
author_facet | Kitahara, Teppei Okui, Takemichi Perez, Gilad Soreq, Yotam Tobioka, Kohsaku |
author_sort | Kitahara, Teppei |
collection | CERN |
description | 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 K+→π+νν¯ decay, bounded by data from the E949 and the NA62 experiments. |
id | cern-2690977 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2019 |
record_format | invenio |
spelling | cern-26909772021-07-15T02:34:41Zdoi:10.1103/PhysRevLett.124.071801http://cds.cern.ch/record/2690977engKitahara, TeppeiOkui, TakemichiPerez, GiladSoreq, YotamTobioka, KohsakuNew physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTOhep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyThe 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 K+→π+νν¯ decay, bounded by data from the E949 and the NA62 experiments.The KOTO experiment recently reported four candidate events in the signal region of $K_L\to \pi^0 \nu\bar\nu$ search, where the standard model only expects $0.10\pm 0.02$ 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 "$\nu\bar{\nu}$" 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 $K^+ \to \pi^+\nu\bar{\nu}$ decay, bounded by data from the E949 and the NA62 experiments.arXiv:1909.11111KEK-TH-2157CERN-TH-2019-151oai:cds.cern.ch:26909772019-09-24 |
spellingShingle | hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology Kitahara, Teppei Okui, Takemichi Perez, Gilad Soreq, Yotam Tobioka, Kohsaku New physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTO |
title | New physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTO |
title_full | New physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTO |
title_fullStr | New physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTO |
title_full_unstemmed | New physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTO |
title_short | New physics implications of recent search for $K_L \to \pi^0 \nu\bar{\nu}$ at KOTO |
title_sort | new physics implications of recent search for $k_l \to \pi^0 \nu\bar{\nu}$ at koto |
topic | hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1103/PhysRevLett.124.071801 http://cds.cern.ch/record/2690977 |
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