A new search for the KL → π0ν ν and KL → π 0X0 decays

J. K. Ahn; K. Y. Baek; S. Banno; B. Beckford; B. Brubaker; T. Cai; M. Campbell; C. Carruth; S. H. Chen; S. Chu; J. Comfort; Y. T. Duh; T. Furukawa; H. Haraguchi; T. Hineno; Y. B. Hsiung; M. Hutcheson; T. Inagaki; M. Isoe; E. Iwai; T. Kamibayashi; I. Kamiji; N. Kawasaki; E. J. Kim; Y. J. Kim; J. W. Ko; T. K. Komatsubara; A. S. Kurilin; G. H. Lee; H. S. Lee; J. W. Lee; S. K. Lee; G. Y. Lim; C. Lin; J. Ma; Y. Maeda; T. Masuda; T. Matsumura; D. McFarland; J. Micallef; K. Miyazaki; K. Morgan; R. Murayama; D. Naito; K. Nakagiri; Y. Nakajima; Y. Nakaya; H. Nanjo; T. Nomura; T. Nomura; Y. Odani; R. Ogata; H. Okuno; T. Ota; Y. D. Ri; M. Sasaki; N. Sasao; K. Sato; T. Sato; S. Seki; T. Shimogawa; T. Shinkawa; S. Shinohara; K. Shiomi; J. S. Son; J. Stevens; S. Su; Y. Sugiyama; S. Suzuki; Y. Tajima; G. Takahashi; Y. Takashima; M. Tecchio; I. Teo; M. Togawa; T. Toyoda; Y. C. Tung; T. Usuki; Y. W. Wah; H. Watanabe; N. Whallon; J. K. Woo; J. Xu; M. Yamaga; S. Yamamoto; T. Yamanaka; H. Yamauchi; Y. Yanagida; H. Yokota; H. Y. Yoshida; H. Yoshimoto

doi:10.1093/ptep/ptx001

A new search for the K_L → π⁰ν ν and K_L → π ⁰X⁰ decays

J. K. Ahn, K. Y. Baek, S. Banno, B. Beckford, B. Brubaker, T. Cai, M. Campbell, C. Carruth, S. H. Chen, S. Chu, J. Comfort, Y. T. Duh, T. Furukawa, H. Haraguchi, T. Hineno, Y. B. Hsiung, M. Hutcheson, T. Inagaki, M. Isoe, E. IwaiT. Kamibayashi, I. Kamiji, N. Kawasaki, E. J. Kim, Y. J. Kim, J. W. Ko, T. K. Komatsubara, A. S. Kurilin, G. H. Lee, H. S. Lee, J. W. Lee, S. K. Lee, G. Y. Lim, C. Lin, J. Ma, Y. Maeda, T. Masuda, T. Matsumura, D. McFarland, J. Micallef, K. Miyazaki, K. Morgan, R. Murayama, D. Naito, K. Nakagiri, Y. Nakajima, Y. Nakaya, H. Nanjo, T. Nomura, T. Nomura, Y. Odani, R. Ogata, H. Okuno, T. Ota, Y. D. Ri, M. Sasaki, N. Sasao, K. Sato, T. Sato, S. Seki, T. Shimogawa, T. Shinkawa, S. Shinohara, K. Shiomi, J. S. Son, J. Stevens, S. Su, Y. Sugiyama, S. Suzuki, Y. Tajima, G. Takahashi, Y. Takashima, M. Tecchio, I. Teo, M. Togawa, T. Toyoda, Y. C. Tung, T. Usuki, Y. W. Wah, H. Watanabe, N. Whallon, J. K. Woo, J. Xu, M. Yamaga, S. Yamamoto, T. Yamanaka, H. Yamauchi, Y. Yanagida, H. Yokota, H. Y. Yoshida, H. Yoshimoto

Research Institute for Interdisciplinary Science

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Abstract

We searched for the CP-violating rare decay of the neutral kaon, K_L → π⁰ν ν, in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experiment. One candidate event was observed while 0.34 ± 0.16 background events were expected.We set an upper limit of 5.1 × 10^-8 for the branching fraction at the 90% confidence level (C.L.). An upper limit of 3.7 × 10^-8 at the 90% C.L. for the K_L → π⁰X⁰ decay was also set for the first time, where X⁰ is an invisible particle with a mass of 135 MeV/c².

Original language	English
Article number	021C01
Journal	Progress of Theoretical and Experimental Physics
Volume	2017
Issue number	2
DOIs	https://doi.org/10.1093/ptep/ptx001
Publication status	Published - Feb 1 2017

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1093/ptep/ptx001

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Ahn, J. K., Baek, K. Y., Banno, S., Beckford, B., Brubaker, B., Cai, T., Campbell, M., Carruth, C., Chen, S. H., Chu, S., Comfort, J., Duh, Y. T., Furukawa, T., Haraguchi, H., Hineno, T., Hsiung, Y. B., Hutcheson, M., Inagaki, T., Isoe, M., ... Yoshimoto, H. (2017). A new search for the K_L → π⁰ν ν and K_L → π ⁰X⁰ decays. Progress of Theoretical and Experimental Physics, 2017(2), [021C01]. https://doi.org/10.1093/ptep/ptx001

Ahn, JK, Baek, KY, Banno, S, Beckford, B, Brubaker, B, Cai, T, Campbell, M, Carruth, C, Chen, SH, Chu, S, Comfort, J, Duh, YT, Furukawa, T, Haraguchi, H, Hineno, T, Hsiung, YB, Hutcheson, M, Inagaki, T, Isoe, M, Iwai, E, Kamibayashi, T, Kamiji, I, Kawasaki, N, Kim, EJ, Kim, YJ, Ko, JW, Komatsubara, TK, Kurilin, AS, Lee, GH, Lee, HS, Lee, JW, Lee, SK, Lim, GY, Lin, C, Ma, J, Maeda, Y, Masuda, T, Matsumura, T, McFarland, D, Micallef, J, Miyazaki, K, Morgan, K, Murayama, R, Naito, D, Nakagiri, K, Nakajima, Y, Nakaya, Y, Nanjo, H, Nomura, T, Nomura, T, Odani, Y, Ogata, R, Okuno, H, Ota, T, Ri, YD, Sasaki, M, Sasao, N, Sato, K, Sato, T, Seki, S, Shimogawa, T, Shinkawa, T, Shinohara, S, Shiomi, K, Son, JS, Stevens, J, Su, S, Sugiyama, Y, Suzuki, S, Tajima, Y, Takahashi, G, Takashima, Y, Tecchio, M, Teo, I, Togawa, M, Toyoda, T, Tung, YC, Usuki, T, Wah, YW, Watanabe, H, Whallon, N, Woo, JK, Xu, J, Yamaga, M, Yamamoto, S, Yamanaka, T, Yamauchi, H, Yanagida, Y, Yokota, H, Yoshida, HY & Yoshimoto, H 2017, 'A new search for the K_L → π⁰ν ν and K_L → π ⁰X⁰ decays', Progress of Theoretical and Experimental Physics, vol. 2017, no. 2, 021C01. https://doi.org/10.1093/ptep/ptx001

@article{4bdd3c6c99124c7fa768d2a680d0b154,

title = "A new search for the KL → π0ν ν and KL → π 0X0 decays",

abstract = "We searched for the CP-violating rare decay of the neutral kaon, KL → π0ν ν, in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experiment. One candidate event was observed while 0.34 ± 0.16 background events were expected.We set an upper limit of 5.1 × 10-8 for the branching fraction at the 90% confidence level (C.L.). An upper limit of 3.7 × 10-8 at the 90% C.L. for the KL → π0X0 decay was also set for the first time, where X0 is an invisible particle with a mass of 135 MeV/c2.",

author = "Ahn, {J. K.} and Baek, {K. Y.} and S. Banno and B. Beckford and B. Brubaker and T. Cai and M. Campbell and C. Carruth and Chen, {S. H.} and S. Chu and J. Comfort and Duh, {Y. T.} and T. Furukawa and H. Haraguchi and T. Hineno and Hsiung, {Y. B.} and M. Hutcheson and T. Inagaki and M. Isoe and E. Iwai and T. Kamibayashi and I. Kamiji and N. Kawasaki and Kim, {E. J.} and Kim, {Y. J.} and Ko, {J. W.} and Komatsubara, {T. K.} and Kurilin, {A. S.} and Lee, {G. H.} and Lee, {H. S.} and Lee, {J. W.} and Lee, {S. K.} and Lim, {G. Y.} and C. Lin and J. Ma and Y. Maeda and T. Masuda and T. Matsumura and D. McFarland and J. Micallef and K. Miyazaki and K. Morgan and R. Murayama and D. Naito and K. Nakagiri and Y. Nakajima and Y. Nakaya and H. Nanjo and T. Nomura and T. Nomura and Y. Odani and R. Ogata and H. Okuno and T. Ota and Ri, {Y. D.} and M. Sasaki and N. Sasao and K. Sato and T. Sato and S. Seki and T. Shimogawa and T. Shinkawa and S. Shinohara and K. Shiomi and Son, {J. S.} and J. Stevens and S. Su and Y. Sugiyama and S. Suzuki and Y. Tajima and G. Takahashi and Y. Takashima and M. Tecchio and I. Teo and M. Togawa and T. Toyoda and Tung, {Y. C.} and T. Usuki and Wah, {Y. W.} and H. Watanabe and N. Whallon and Woo, {J. K.} and J. Xu and M. Yamaga and S. Yamamoto and T. Yamanaka and H. Yamauchi and Y. Yanagida and H. Yokota and Yoshida, {H. Y.} and H. Yoshimoto",

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. 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 Number JP18071006, the JSPS KAKENHI Grant Number JP23224007, 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 Award Numbers DE-SC0006497, DE-SC0007859, and DE-SC0009798; the Ministry of Education and the National Science Council/Ministry of Science and Technology in Taiwan under Grant Numbers 99-2112-M-002-014- MY3 and 102-2112-M-002-017; and the National Research Foundation of Korea (2012R-1A2A2A004554, 2013K1A3A7A06056592 (Center of Korean J-PARC Users), and 2015R1A2A1A15056254). Some of the authors were supported by Grants-in-Aid for JSPS Fellows. Publisher Copyright: {\textcopyright} The Author(s) 2017.",

year = "2017",

month = feb,

day = "1",

doi = "10.1093/ptep/ptx001",

language = "English",

volume = "2017",

journal = "Progress of Theoretical and Experimental Physics",

issn = "2050-3911",

publisher = "Oxford University Press",

number = "2",

}

TY - JOUR

T1 - A new search for the KL → π0ν ν and KL → π 0X0 decays

AU - Ahn, J. K.

AU - Baek, K. Y.

AU - Banno, S.

AU - Beckford, B.

AU - Brubaker, B.

AU - Cai, T.

AU - Campbell, M.

AU - Carruth, C.

AU - Chen, S. H.

AU - Chu, S.

AU - Comfort, J.

AU - Duh, Y. T.

AU - Furukawa, T.

AU - Haraguchi, H.

AU - Hineno, T.

AU - Hsiung, Y. B.

AU - Hutcheson, M.

AU - Inagaki, T.

AU - Isoe, M.

AU - Iwai, E.

AU - Kamibayashi, T.

AU - Kamiji, I.

AU - Kawasaki, N.

AU - Kim, E. J.

AU - Kim, Y. J.

AU - Ko, J. W.

AU - Komatsubara, T. K.

AU - Kurilin, A. S.

AU - Lee, G. H.

AU - Lee, H. S.

AU - Lee, J. W.

AU - Lee, S. K.

AU - Lim, G. Y.

AU - Lin, C.

AU - Ma, J.

AU - Maeda, Y.

AU - Masuda, T.

AU - Matsumura, T.

AU - McFarland, D.

AU - Micallef, J.

AU - Miyazaki, K.

AU - Morgan, K.

AU - Murayama, R.

AU - Naito, D.

AU - Nakagiri, K.

AU - Nakajima, Y.

AU - Nakaya, Y.

AU - Nanjo, H.

AU - Nomura, T.

AU - Odani, Y.

AU - Ogata, R.

AU - Okuno, H.

AU - Ota, T.

AU - Ri, Y. D.

AU - Sasaki, M.

AU - Sasao, N.

AU - Sato, K.

AU - Sato, T.

AU - Seki, S.

AU - Shimogawa, T.

AU - Shinkawa, T.

AU - Shinohara, S.

AU - Shiomi, K.

AU - Son, J. S.

AU - Stevens, J.

AU - Su, S.

AU - Sugiyama, Y.

AU - Suzuki, S.

AU - Tajima, Y.

AU - Takahashi, G.

AU - Takashima, Y.

AU - Tecchio, M.

AU - Teo, I.

AU - Togawa, M.

AU - Toyoda, T.

AU - Tung, Y. C.

AU - Usuki, T.

AU - Wah, Y. W.

AU - Watanabe, H.

AU - Whallon, N.

AU - Woo, J. K.

AU - Xu, J.

AU - Yamaga, M.

AU - Yamamoto, S.

AU - Yamanaka, T.

AU - Yamauchi, H.

AU - Yanagida, Y.

AU - Yokota, H.

AU - Yoshida, H. Y.

AU - Yoshimoto, H.

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. 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 Number JP18071006, the JSPS KAKENHI Grant Number JP23224007, 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 Award Numbers DE-SC0006497, DE-SC0007859, and DE-SC0009798; the Ministry of Education and the National Science Council/Ministry of Science and Technology in Taiwan under Grant Numbers 99-2112-M-002-014- MY3 and 102-2112-M-002-017; and the National Research Foundation of Korea (2012R-1A2A2A004554, 2013K1A3A7A06056592 (Center of Korean J-PARC Users), and 2015R1A2A1A15056254). Some of the authors were supported by Grants-in-Aid for JSPS Fellows. Publisher Copyright: © The Author(s) 2017.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - We searched for the CP-violating rare decay of the neutral kaon, KL → π0ν ν, in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experiment. One candidate event was observed while 0.34 ± 0.16 background events were expected.We set an upper limit of 5.1 × 10-8 for the branching fraction at the 90% confidence level (C.L.). An upper limit of 3.7 × 10-8 at the 90% C.L. for the KL → π0X0 decay was also set for the first time, where X0 is an invisible particle with a mass of 135 MeV/c2.

AB - We searched for the CP-violating rare decay of the neutral kaon, KL → π0ν ν, in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experiment. One candidate event was observed while 0.34 ± 0.16 background events were expected.We set an upper limit of 5.1 × 10-8 for the branching fraction at the 90% confidence level (C.L.). An upper limit of 3.7 × 10-8 at the 90% C.L. for the KL → π0X0 decay was also set for the first time, where X0 is an invisible particle with a mass of 135 MeV/c2.

UR - http://www.scopus.com/inward/record.url?scp=85015994825&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85015994825&partnerID=8YFLogxK

U2 - 10.1093/ptep/ptx001

DO - 10.1093/ptep/ptx001

M3 - Article

AN - SCOPUS:85015994825

SN - 2050-3911

VL - 2017

JO - Progress of Theoretical and Experimental Physics

JF - Progress of Theoretical and Experimental Physics

IS - 2

M1 - 021C01

ER -

A new search for the K_L → π⁰ν ν and K_L → π ⁰X⁰ decays

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