Study of the KL → π0 ν ν Decay at the J-PARC KOTO Experiment

(KOTO Collaboration)

doi:10.1103/PhysRevLett.126.121801

Study of the KL → π0 ν ν Decay at the J-PARC KOTO Experiment

(KOTO Collaboration)

Department of Physics

Research output: Contribution to journal › Article › peer-review

73 Citations (Scopus)

Abstract

The rare decay KL was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.05stat±0.66syst)×10-10, three candidate events were observed in the signal region. After unveiling them, contaminations from K± and scattered KL decays were studied, and the total number of background events was estimated to be 1.22±0.26. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of 4.9×10-9 on the branching fraction of KL→ π0ν ν at the 90% confidence level.

Original language	English
Article number	121801
Journal	Physical review letters
Volume	126
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.126.121801
Publication status	Published - 2021 Mar 24

Bibliographical note

Publisher Copyright:
© 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.126.121801

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@article{6aa1f805062a4d78a23345cdb78142fa,

title = "Study of the KL → π0 ν ν Decay at the J-PARC KOTO Experiment",

abstract = "The rare decay KL was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.05stat±0.66syst)×10-10, three candidate events were observed in the signal region. After unveiling them, contaminations from K± and scattered KL decays were studied, and the total number of background events was estimated to be 1.22±0.26. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of 4.9×10-9 on the branching fraction of KL→ π0ν ν at the 90% confidence level.",

author = "{(KOTO Collaboration)} and Ahn, {J. K.} and B. Beckford and M. Campbell and Chen, {S. H.} and J. Comfort and K. Dona and Farrington, {M. S.} and K. Hanai and N. Hara and H. Haraguchi and Hsiung, {Y. B.} and M. Hutcheson and T. Inagaki and M. Isoe and I. Kamiji and T. Kato and Kim, {E. J.} and Kim, {J. L.} and Kim, {H. M.} and Komatsubara, {T. K.} and K. Kotera and Lee, {S. K.} and Lee, {J. W.} and Lim, {G. Y.} and Lin, {Q. S.} and C. Lin and Y. Luo and T. Mari and T. Masuda and T. Matsumura and D. McFarland and N. McNeal and K. Miyazaki and R. Murayama and K. Nakagiri and H. Nanjo and H. Nishimiya and Y. Noichi and T. Nomura and T. Nunes and M. Ohsugi and H. Okuno and Redeker, {J. C.} and J. Sanchez and M. Sasaki and N. Sasao and T. Sato and K. Sato and Y. Sato and N. Shimizu",

note = "Publisher Copyright: {\textcopyright} 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.",

year = "2021",

month = mar,

day = "24",

doi = "10.1103/PhysRevLett.126.121801",

language = "English",

volume = "126",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "12",

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TY - JOUR

T1 - Study of the KL → π0 ν ν Decay at the J-PARC KOTO Experiment

AU - (KOTO Collaboration)

AU - Ahn, J. K.

AU - Beckford, B.

AU - Campbell, M.

AU - Chen, S. H.

AU - Comfort, J.

AU - Dona, K.

AU - Farrington, M. S.

AU - Hanai, K.

AU - Hara, N.

AU - Haraguchi, H.

AU - Hsiung, Y. B.

AU - Hutcheson, M.

AU - Inagaki, T.

AU - Isoe, M.

AU - Kamiji, I.

AU - Kato, T.

AU - Kim, E. J.

AU - Kim, J. L.

AU - Kim, H. M.

AU - Komatsubara, T. K.

AU - Kotera, K.

AU - Lee, S. K.

AU - Lee, J. W.

AU - Lim, G. Y.

AU - Lin, Q. S.

AU - Lin, C.

AU - Luo, Y.

AU - Mari, T.

AU - Masuda, T.

AU - Matsumura, T.

AU - McFarland, D.

AU - McNeal, N.

AU - Miyazaki, K.

AU - Murayama, R.

AU - Nakagiri, K.

AU - Nanjo, H.

AU - Nishimiya, H.

AU - Noichi, Y.

AU - Nomura, T.

AU - Nunes, T.

AU - Ohsugi, M.

AU - Okuno, H.

AU - Redeker, J. C.

AU - Sanchez, J.

AU - Sasaki, M.

AU - Sasao, N.

AU - Sato, T.

AU - Sato, K.

AU - Sato, Y.

AU - Shimizu, N.

N1 - Publisher Copyright: © 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

PY - 2021/3/24

Y1 - 2021/3/24

N2 - The rare decay KL was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.05stat±0.66syst)×10-10, three candidate events were observed in the signal region. After unveiling them, contaminations from K± and scattered KL decays were studied, and the total number of background events was estimated to be 1.22±0.26. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of 4.9×10-9 on the branching fraction of KL→ π0ν ν at the 90% confidence level.

AB - The rare decay KL was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.05stat±0.66syst)×10-10, three candidate events were observed in the signal region. After unveiling them, contaminations from K± and scattered KL decays were studied, and the total number of background events was estimated to be 1.22±0.26. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of 4.9×10-9 on the branching fraction of KL→ π0ν ν at the 90% confidence level.

UR - http://www.scopus.com/inward/record.url?scp=85103521442&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.126.121801

DO - 10.1103/PhysRevLett.126.121801

M3 - Article

C2 - 33834796

AN - SCOPUS:85103521442

SN - 0031-9007

VL - 126

JO - Physical review letters

JF - Physical review letters

IS - 12

M1 - 121801

ER -

Study of the KL → π0 ν ν Decay at the J-PARC KOTO Experiment

Abstract

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