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. KomatsubaraK. 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 Institute for Interdisciplinary Science

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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 - Jan 15 2019

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.122.021802

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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{799ed697e2244c3493c14a92fadf5290,

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 = "Funding Information: We would like to express our gratitude to all members of the J-PARC Accelerator and Hadron Experimental Facility groups for their support. We also thank the KEK Computing Research Center for KEKCC and the National Institute of Information for SINET4. We thank K. Yamamoto for useful discussions. This material is based upon work supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan and the Japan Society for the Promotion of Science (JSPS) under the MEXT KAKENHI Grant No. JP18071006, the JSPS KAKENHI Grants No. JP23224007, No. JP16H06343, and No. JP17K05479, and through the Japan-U.S. Cooperative Research Program in High Energy Physics; the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Awards No. DE-SC0006497, No. DE-SC0007859, and No. DE-SC0009798; the Ministry of Education and the National Science Council/Ministry of Science and Technology in Taiwan under Grants No. 99-2112-M-002-014-MY3 and No. 102-2112-M-002-017; and the National Research Foundation of Korea (2017R1A2B2011334 and 2017R1A2B4006359). Some of the authors were supported by Grants-in-Aid for JSPS Fellows. 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",

issn = "0031-9007",

publisher = "American Physical Society",

number = "2",

}

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.

N1 - Funding Information: We would like to express our gratitude to all members of the J-PARC Accelerator and Hadron Experimental Facility groups for their support. We also thank the KEK Computing Research Center for KEKCC and the National Institute of Information for SINET4. We thank K. Yamamoto for useful discussions. This material is based upon work supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan and the Japan Society for the Promotion of Science (JSPS) under the MEXT KAKENHI Grant No. JP18071006, the JSPS KAKENHI Grants No. JP23224007, No. JP16H06343, and No. JP17K05479, and through the Japan-U.S. Cooperative Research Program in High Energy Physics; the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Awards No. DE-SC0006497, No. DE-SC0007859, and No. DE-SC0009798; the Ministry of Education and the National Science Council/Ministry of Science and Technology in Taiwan under Grants No. 99-2112-M-002-014-MY3 and No. 102-2112-M-002-017; and the National Research Foundation of Korea (2017R1A2B2011334 and 2017R1A2B4006359). Some of the authors were supported by Grants-in-Aid for JSPS Fellows. Publisher Copyright: © 2019 authors. Published by the American Physical Society.

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.

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UR - http://www.scopus.com/inward/citedby.url?scp=85060709299&partnerID=8YFLogxK

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 -

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

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