Search for KL →π0ν ν  and KL →π0X0 Decays at the J-PARC KOTO Experiment

J. K. Ahn; B. Beckford; J. Beechert; K. Bryant; M. Campbell; S. H. Chen; J. Comfort; K. Dona; N. Hara; H. Haraguchi; Y. B. Hsiung; M. Hutcheson; T. Inagaki; I. Kamiji; N. Kawasaki; E. J. Kim; J. L. Kim; Y. J. Kim; J. W. Ko; T. K. Komatsubara; K. Kotera; A. S. Kurilin; J. W. Lee; G. Y. Lim; C. Lin; Q. Lin; Y. Luo; J. Ma; Y. Maeda; T. Mari; T. Masuda; T. Matsumura; D. McFarland; N. McNeal; J. Micallef; K. Miyazaki; R. Murayama; D. Naito; K. Nakagiri; H. Nanjo; H. Nishimiya; T. Nomura; M. Ohsugi; H. Okuno; M. Sasaki; N. Sasao; K. Sato; T. Sato; Y. Sato; H. Schamis; S. Seki; N. Shimizu; T. Shimogawa; T. Shinkawa; S. Shinohara; K. Shiomi; S. Su; Y. Sugiyama; S. Suzuki; Y. Tajima; M. Taylor; M. Tecchio; M. Togawa; Y. C. Tung; Y. W. Wah; H. Watanabe; J. K. Woo; T. Yamanaka; H. Y. Yoshida

doi:10.1103/PhysRevLett.122.021802

Search for KL →π0ν ν and KL →π0X0 Decays at the J-PARC KOTO Experiment

J. K. Ahn
, B. Beckford
, J. Beechert
, K. Bryant
, M. Campbell
, S. H. Chen
, J. Comfort
, K. Dona
, N. Hara
, H. Haraguchi
, Y. B. Hsiung
, M. Hutcheson
, T. Inagaki
, I. Kamiji
, N. Kawasaki
, E. J. Kim
, J. L. Kim
, Y. J. Kim
, J. W. Ko
, T. K. Komatsubara

K. Kotera, A. S. Kurilin, J. W. Lee, G. Y. Lim, C. Lin, Q. Lin, Y. Luo, J. Ma, Y. Maeda, T. Mari, T. Masuda, T. Matsumura, D. McFarland, N. McNeal, J. Micallef, K. Miyazaki, R. Murayama, D. Naito, K. Nakagiri, H. Nanjo, H. Nishimiya, T. Nomura, M. Ohsugi, H. Okuno, M. Sasaki, N. Sasao, K. Sato, T. Sato, Y. Sato, H. Schamis, S. Seki, N. Shimizu, T. Shimogawa, T. Shinkawa, S. Shinohara, K. Shiomi, S. Su, Y. Sugiyama, S. Suzuki, Y. Tajima, M. Taylor, M. Tecchio, M. Togawa, Y. C. Tung, Y. W. Wah, H. Watanabe, J. K. Woo, T. Yamanaka, H. Y. Yoshida

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

191 Citations (Scopus)

Abstract

A search for the rare decay KL→π0νν was performed. With the data collected in 2015, corresponding to 2.2×1019 protons on target, a single event sensitivity of (1.30±0.01stat±0.14syst)×10-9 was achieved and no candidate events were observed. We set an upper limit of 3.0×10-9 for the branching fraction of KL→π0νν at the 90% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for KL→π0X0 was also set as 2.4×10-9 at the 90% C.L., where X0 is an invisible boson with a mass of 135 MeV/c2.

Original language	English
Article number	021802
Journal	Physical review letters
Volume	122
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.122.021802
Publication status	Published - 2019 Jan 15

Bibliographical note

Publisher Copyright:
© 2019 authors. Published by the American Physical Society.

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1103/PhysRevLett.122.021802

Cite this

Ahn, J. K., Beckford, B., Beechert, J., Bryant, K., Campbell, M., Chen, S. H., Comfort, J., Dona, K., Hara, N., Haraguchi, H., Hsiung, Y. B., Hutcheson, M., Inagaki, T., Kamiji, I., Kawasaki, N., Kim, E. J., Kim, J. L., Kim, Y. J., Ko, J. W., ... Yoshida, H. Y. (2019). Search for KL →π0ν ν and KL →π0X0 Decays at the J-PARC KOTO Experiment. Physical review letters, 122(2), Article 021802. https://doi.org/10.1103/PhysRevLett.122.021802

Ahn, JK, Beckford, B, Beechert, J, Bryant, K, Campbell, M, Chen, SH, Comfort, J, Dona, K, Hara, N, Haraguchi, H, Hsiung, YB, Hutcheson, M, Inagaki, T, Kamiji, I, Kawasaki, N, Kim, EJ, Kim, JL, Kim, YJ, Ko, JW, Komatsubara, TK, Kotera, K, Kurilin, AS, Lee, JW, Lim, GY, Lin, C, Lin, Q, Luo, Y, Ma, J, Maeda, Y, Mari, T, Masuda, T, Matsumura, T, McFarland, D, McNeal, N, Micallef, J, Miyazaki, K, Murayama, R, Naito, D, Nakagiri, K, Nanjo, H, Nishimiya, H, Nomura, T, Ohsugi, M, Okuno, H, Sasaki, M, Sasao, N, Sato, K, Sato, T, Sato, Y, Schamis, H, Seki, S, Shimizu, N, Shimogawa, T, Shinkawa, T, Shinohara, S, Shiomi, K, Su, S, Sugiyama, Y, Suzuki, S, Tajima, Y, Taylor, M, Tecchio, M, Togawa, M, Tung, YC, Wah, YW, Watanabe, H, Woo, JK, Yamanaka, T & Yoshida, HY 2019, 'Search for KL →π0ν ν and KL →π0X0 Decays at the J-PARC KOTO Experiment', Physical review letters, vol. 122, no. 2, 021802. https://doi.org/10.1103/PhysRevLett.122.021802

@article{8ce847f49d34456786fe6826b028971c,

title = "Search for KL →π0ν ν and KL →π0X0 Decays at the J-PARC KOTO Experiment",

abstract = "A search for the rare decay KL→π0νν was performed. With the data collected in 2015, corresponding to 2.2×1019 protons on target, a single event sensitivity of (1.30±0.01stat±0.14syst)×10-9 was achieved and no candidate events were observed. We set an upper limit of 3.0×10-9 for the branching fraction of KL→π0νν at the 90\% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for KL→π0X0 was also set as 2.4×10-9 at the 90\% C.L., where X0 is an invisible boson with a mass of 135 MeV/c2.",

author = "Ahn, \{J. K.\} and B. Beckford and J. Beechert and K. Bryant and M. Campbell and Chen, \{S. H.\} and J. Comfort and K. Dona and N. Hara and H. Haraguchi and Hsiung, \{Y. B.\} and M. Hutcheson and T. Inagaki and I. Kamiji and N. Kawasaki and Kim, \{E. J.\} and Kim, \{J. L.\} and Kim, \{Y. J.\} and Ko, \{J. W.\} and Komatsubara, \{T. K.\} and K. Kotera and Kurilin, \{A. S.\} and Lee, \{J. W.\} and Lim, \{G. Y.\} and C. Lin and Q. Lin and Y. Luo and J. Ma and Y. Maeda and T. Mari and T. Masuda and T. Matsumura and D. McFarland and N. McNeal and J. Micallef and K. Miyazaki and R. Murayama and D. Naito and K. Nakagiri and H. Nanjo and H. Nishimiya and T. Nomura and M. Ohsugi and H. Okuno and M. Sasaki and N. Sasao and K. Sato and T. Sato and Y. Sato and H. Schamis and S. Seki and N. Shimizu and T. Shimogawa and T. Shinkawa and S. Shinohara and K. Shiomi and S. Su and Y. Sugiyama and S. Suzuki and Y. Tajima and M. Taylor and M. Tecchio and M. Togawa and Tung, \{Y. C.\} and Wah, \{Y. W.\} and H. Watanabe and Woo, \{J. K.\} and T. Yamanaka and Yoshida, \{H. Y.\}",

note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society.",

year = "2019",

month = jan,

day = "15",

doi = "10.1103/PhysRevLett.122.021802",

language = "English",

volume = "122",

journal = "Physical review letters",

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TY - JOUR

T1 - Search for KL →π0ν ν and KL →π0X0 Decays at the J-PARC KOTO Experiment

AU - Ahn, J. K.

AU - Beckford, B.

AU - Beechert, J.

AU - Bryant, K.

AU - Campbell, M.

AU - Chen, S. H.

AU - Comfort, J.

AU - Dona, K.

AU - Hara, N.

AU - Haraguchi, H.

AU - Hsiung, Y. B.

AU - Hutcheson, M.

AU - Inagaki, T.

AU - Kamiji, I.

AU - Kawasaki, N.

AU - Kim, E. J.

AU - Kim, J. L.

AU - Kim, Y. J.

AU - Ko, J. W.

AU - Komatsubara, T. K.

AU - Kotera, K.

AU - Kurilin, A. S.

AU - Lee, J. W.

AU - Lim, G. Y.

AU - Lin, C.

AU - Lin, Q.

AU - Luo, Y.

AU - Ma, J.

AU - Maeda, Y.

AU - Mari, T.

AU - Masuda, T.

AU - Matsumura, T.

AU - McFarland, D.

AU - McNeal, N.

AU - Micallef, J.

AU - Miyazaki, K.

AU - Murayama, R.

AU - Naito, D.

AU - Nakagiri, K.

AU - Nanjo, H.

AU - Nishimiya, H.

AU - Nomura, T.

AU - Ohsugi, M.

AU - Okuno, H.

AU - Sasaki, M.

AU - Sasao, N.

AU - Sato, K.

AU - Sato, T.

AU - Sato, Y.

AU - Schamis, H.

AU - Seki, S.

AU - Shimizu, N.

AU - Shimogawa, T.

AU - Shinkawa, T.

AU - Shinohara, S.

AU - Shiomi, K.

AU - Su, S.

AU - Sugiyama, Y.

AU - Suzuki, S.

AU - Tajima, Y.

AU - Taylor, M.

AU - Tecchio, M.

AU - Togawa, M.

AU - Tung, Y. C.

AU - Wah, Y. W.

AU - Watanabe, H.

AU - Woo, J. K.

AU - Yamanaka, T.

AU - Yoshida, H. Y.

PY - 2019/1/15

Y1 - 2019/1/15

N2 - A search for the rare decay KL→π0νν was performed. With the data collected in 2015, corresponding to 2.2×1019 protons on target, a single event sensitivity of (1.30±0.01stat±0.14syst)×10-9 was achieved and no candidate events were observed. We set an upper limit of 3.0×10-9 for the branching fraction of KL→π0νν at the 90% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for KL→π0X0 was also set as 2.4×10-9 at the 90% C.L., where X0 is an invisible boson with a mass of 135 MeV/c2.

AB - A search for the rare decay KL→π0νν was performed. With the data collected in 2015, corresponding to 2.2×1019 protons on target, a single event sensitivity of (1.30±0.01stat±0.14syst)×10-9 was achieved and no candidate events were observed. We set an upper limit of 3.0×10-9 for the branching fraction of KL→π0νν at the 90% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for KL→π0X0 was also set as 2.4×10-9 at the 90% C.L., where X0 is an invisible boson with a mass of 135 MeV/c2.

UR - https://www.scopus.com/pages/publications/85060709299

U2 - 10.1103/PhysRevLett.122.021802

DO - 10.1103/PhysRevLett.122.021802

M3 - Article

C2 - 30720307

AN - SCOPUS:85060709299

SN - 0031-9007

VL - 122

JO - Physical review letters

JF - Physical review letters

IS - 2

M1 - 021802

ER -