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 & 71 others 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, Takahiko 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, Noboru 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

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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.

Original languageEnglish
Article number021C01
JournalProgress of Theoretical and Experimental Physics
Volume2017
Issue number2
DOIs
Publication statusPublished - Feb 1 2017

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decay
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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ahn, J. K., Baek, K. Y., Banno, S., Beckford, B., Brubaker, B., Cai, T., ... Yoshimoto, H. (2017). A new search for the KL → π0ν ν and KL → π 0X0 decays. Progress of Theoretical and Experimental Physics, 2017(2), [021C01]. https://doi.org/10.1093/ptep/ptx001

A new search for the KL → π0ν ν and KL → π 0X0 decays. / 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.; Iwai, E.; Kamibayashi, T.; Kamiji, I.; Kawasaki, N.; Kim, E. J.; Kim, Y. J.; Ko, J. W.; Komatsubara, T. K.; Kurilin, A. S.; Lee, G. H.; Lee, H. S.; Lee, J. W.; Lee, S. K.; Lim, G. Y.; Lin, C.; Ma, J.; Maeda, Y.; Masuda, Takahiko; 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, Y. D.; Sasaki, M.; Sasao, Noboru; Sato, K.; Sato, T.; Seki, S.; Shimogawa, T.; Shinkawa, T.; Shinohara, S.; Shiomi, K.; Son, J. S.; Stevens, J.; Su, S.; Sugiyama, Y.; Suzuki, S.; Tajima, Y.; Takahashi, G.; Takashima, Y.; Tecchio, M.; Teo, I.; Togawa, M.; Toyoda, T.; Tung, Y. C.; Usuki, T.; Wah, Y. W.; Watanabe, H.; Whallon, N.; Woo, J. K.; Xu, J.; Yamaga, M.; Yamamoto, S.; Yamanaka, T.; Yamauchi, H.; Yanagida, Y.; Yokota, H.; Yoshida, H. Y.; Yoshimoto, H.

In: Progress of Theoretical and Experimental Physics, Vol. 2017, No. 2, 021C01, 01.02.2017.

Research output: Contribution to journalArticle

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 KL → π0ν ν and KL → π 0X0 decays', Progress of Theoretical and Experimental Physics, vol. 2017, no. 2, 021C01. https://doi.org/10.1093/ptep/ptx001
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. ; Iwai, E. ; Kamibayashi, T. ; Kamiji, I. ; Kawasaki, N. ; Kim, E. J. ; Kim, Y. J. ; Ko, J. W. ; Komatsubara, T. K. ; Kurilin, A. S. ; Lee, G. H. ; Lee, H. S. ; Lee, J. W. ; Lee, S. K. ; Lim, G. Y. ; Lin, C. ; Ma, J. ; Maeda, Y. ; Masuda, Takahiko ; 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, Y. D. ; Sasaki, M. ; Sasao, Noboru ; Sato, K. ; Sato, T. ; Seki, S. ; Shimogawa, T. ; Shinkawa, T. ; Shinohara, S. ; Shiomi, K. ; Son, J. S. ; Stevens, J. ; Su, S. ; Sugiyama, Y. ; Suzuki, S. ; Tajima, Y. ; Takahashi, G. ; Takashima, Y. ; Tecchio, M. ; Teo, I. ; Togawa, M. ; Toyoda, T. ; Tung, Y. C. ; Usuki, T. ; Wah, Y. W. ; Watanabe, H. ; Whallon, N. ; Woo, J. K. ; Xu, J. ; Yamaga, M. ; Yamamoto, S. ; Yamanaka, T. ; Yamauchi, H. ; Yanagida, Y. ; Yokota, H. ; Yoshida, H. Y. ; Yoshimoto, H. / A new search for the KL → π0ν ν and KL → π 0X0 decays. In: Progress of Theoretical and Experimental Physics. 2017 ; Vol. 2017, No. 2.
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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, Takahiko

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 - Nomura, T.

AU - Odani, Y.

AU - Ogata, R.

AU - Okuno, H.

AU - Ota, T.

AU - Ri, Y. D.

AU - Sasaki, M.

AU - Sasao, Noboru

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.

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.

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U2 - 10.1093/ptep/ptx001

DO - 10.1093/ptep/ptx001

M3 - Article

VL - 2017

JO - Progress of Theoretical and Experimental Physics

JF - Progress of Theoretical and Experimental Physics

SN - 2050-3911

IS - 2

M1 - 021C01

ER -