Long-lived neutral-kaon flux measurement for the KOTO experiment

Takahiko Masuda, J. K. Ahn, S. Banno, M. Campbell, J. Comfort, Y. T. Duh, T. Hineno, Y. B. Hsiung, T. Inagaki, E. Iwai, N. Kawasaki, E. J. Kim, Y. J. Kim, J. W. Ko, T. K. Komatsubara, A. S. Kurilin, G. H. Lee, J. W. Lee, S. K. Lee, G. Y. Lim & 37 others J. Ma, D. MacFarland, Y. Maeda, T. Matsumura, R. Murayama, D. Naito, Y. Nakaya, H. Nanjo, T. Nomura, Y. Odani, H. Okuno, Y. D. Ri, Noboru Sasao, K. Sato, T. Sato, S. Seki, T. Shimogawa, T. Shinkawa, K. Shiomi, J. S. Son, Y. Sugiyama, S. Suzuki, Y. Tajima, G. Takahashi, Y. Takashima, M. Tecchio, M. Togawa, T. Toyoda, Y. C. Tung, Y. W. Wah, H. Watanabe, J. K. Woo, J. Xu, T. Yamanaka, Y. Yanagida, H. Y. Yoshida, H. Yoshimoto

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Abstract

The KOTO (K at Tokai) experiment aims to observe the CP-violating rare decay KL → π→→ by using a long-lived neutral-kaon beam produced by the 30 GeV proton beam at the Japan Proton Accelerator Research Complex. The KL flux is an essential parameter for the measurement of the branching fraction. Three KL neutral decay modes, KL → 3p 0, KL → 2π, and KL → 2→, were used to measure the KL flux in the beam line in the 2013 KOTO engineering run. A Monte Carlo simulation was used to estimate the detector acceptance for these decays. Agreement was found between the simulation model and the experimental data, and the remaining systematic uncertainty was estimated at the 1.4% level. The KL flux was measured as (4.183 ± 0.017stat. ± 0.059sys.) × 107 KL per 2 × 1014 protons on a 66-mm-long Au target.

Original languageEnglish
Article number013C03
JournalProgress of Theoretical and Experimental Physics
Volume2016
Issue number1
DOIs
Publication statusPublished - Jan 1 2016

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decay
protons
proton beams
acceptability
Japan
accelerators
simulation
engineering
detectors
estimates

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Masuda, T., Ahn, J. K., Banno, S., Campbell, M., Comfort, J., Duh, Y. T., ... Yoshimoto, H. (2016). Long-lived neutral-kaon flux measurement for the KOTO experiment. Progress of Theoretical and Experimental Physics, 2016(1), [013C03]. https://doi.org/10.1093/ptep/ptv171

Long-lived neutral-kaon flux measurement for the KOTO experiment. / Masuda, Takahiko; Ahn, J. K.; Banno, S.; Campbell, M.; Comfort, J.; Duh, Y. T.; Hineno, T.; Hsiung, Y. B.; Inagaki, T.; Iwai, E.; Kawasaki, N.; Kim, E. J.; Kim, Y. J.; Ko, J. W.; Komatsubara, T. K.; Kurilin, A. S.; Lee, G. H.; Lee, J. W.; Lee, S. K.; Lim, G. Y.; Ma, J.; MacFarland, D.; Maeda, Y.; Matsumura, T.; Murayama, R.; Naito, D.; Nakaya, Y.; Nanjo, H.; Nomura, T.; Odani, Y.; Okuno, H.; Ri, Y. D.; Sasao, Noboru; Sato, K.; Sato, T.; Seki, S.; Shimogawa, T.; Shinkawa, T.; Shiomi, K.; Son, J. S.; Sugiyama, Y.; Suzuki, S.; Tajima, Y.; Takahashi, G.; Takashima, Y.; Tecchio, M.; Togawa, M.; Toyoda, T.; Tung, Y. C.; Wah, Y. W.; Watanabe, H.; Woo, J. K.; Xu, J.; Yamanaka, T.; Yanagida, Y.; Yoshida, H. Y.; Yoshimoto, H.

In: Progress of Theoretical and Experimental Physics, Vol. 2016, No. 1, 013C03, 01.01.2016.

Research output: Contribution to journalArticle

Masuda, T, Ahn, JK, Banno, S, Campbell, M, Comfort, J, Duh, YT, Hineno, T, Hsiung, YB, Inagaki, T, Iwai, E, Kawasaki, N, Kim, EJ, Kim, YJ, Ko, JW, Komatsubara, TK, Kurilin, AS, Lee, GH, Lee, JW, Lee, SK, Lim, GY, Ma, J, MacFarland, D, Maeda, Y, Matsumura, T, Murayama, R, Naito, D, Nakaya, Y, Nanjo, H, Nomura, T, Odani, Y, Okuno, H, Ri, YD, Sasao, N, Sato, K, Sato, T, Seki, S, Shimogawa, T, Shinkawa, T, Shiomi, K, Son, JS, Sugiyama, Y, Suzuki, S, Tajima, Y, Takahashi, G, Takashima, Y, Tecchio, M, Togawa, M, Toyoda, T, Tung, YC, Wah, YW, Watanabe, H, Woo, JK, Xu, J, Yamanaka, T, Yanagida, Y, Yoshida, HY & Yoshimoto, H 2016, 'Long-lived neutral-kaon flux measurement for the KOTO experiment', Progress of Theoretical and Experimental Physics, vol. 2016, no. 1, 013C03. https://doi.org/10.1093/ptep/ptv171
Masuda, Takahiko ; Ahn, J. K. ; Banno, S. ; Campbell, M. ; Comfort, J. ; Duh, Y. T. ; Hineno, T. ; Hsiung, Y. B. ; Inagaki, T. ; Iwai, E. ; Kawasaki, N. ; Kim, E. J. ; Kim, Y. J. ; Ko, J. W. ; Komatsubara, T. K. ; Kurilin, A. S. ; Lee, G. H. ; Lee, J. W. ; Lee, S. K. ; Lim, G. Y. ; Ma, J. ; MacFarland, D. ; Maeda, Y. ; Matsumura, T. ; Murayama, R. ; Naito, D. ; Nakaya, Y. ; Nanjo, H. ; Nomura, T. ; Odani, Y. ; Okuno, H. ; Ri, Y. D. ; Sasao, Noboru ; Sato, K. ; Sato, T. ; Seki, S. ; Shimogawa, T. ; Shinkawa, T. ; Shiomi, K. ; Son, J. S. ; Sugiyama, Y. ; Suzuki, S. ; Tajima, Y. ; Takahashi, G. ; Takashima, Y. ; Tecchio, M. ; Togawa, M. ; Toyoda, T. ; Tung, Y. C. ; Wah, Y. W. ; Watanabe, H. ; Woo, J. K. ; Xu, J. ; Yamanaka, T. ; Yanagida, Y. ; Yoshida, H. Y. ; Yoshimoto, H. / Long-lived neutral-kaon flux measurement for the KOTO experiment. In: Progress of Theoretical and Experimental Physics. 2016 ; Vol. 2016, No. 1.
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title = "Long-lived neutral-kaon flux measurement for the KOTO experiment",
abstract = "The KOTO (K at Tokai) experiment aims to observe the CP-violating rare decay KL → π→→ by using a long-lived neutral-kaon beam produced by the 30 GeV proton beam at the Japan Proton Accelerator Research Complex. The KL flux is an essential parameter for the measurement of the branching fraction. Three KL neutral decay modes, KL → 3p 0, KL → 2π, and KL → 2→, were used to measure the KL flux in the beam line in the 2013 KOTO engineering run. A Monte Carlo simulation was used to estimate the detector acceptance for these decays. Agreement was found between the simulation model and the experimental data, and the remaining systematic uncertainty was estimated at the 1.4{\%} level. The KL flux was measured as (4.183 ± 0.017stat. ± 0.059sys.) × 107 KL per 2 × 1014 protons on a 66-mm-long Au target.",
author = "Takahiko Masuda and Ahn, {J. K.} and S. Banno and M. Campbell and J. Comfort and Duh, {Y. T.} and T. Hineno and Hsiung, {Y. B.} and T. Inagaki and E. Iwai 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, {J. W.} and Lee, {S. K.} and Lim, {G. Y.} and J. Ma and D. MacFarland and Y. Maeda and T. Matsumura and R. Murayama and D. Naito and Y. Nakaya and H. Nanjo and T. Nomura and Y. Odani and H. Okuno and Ri, {Y. D.} and Noboru Sasao and K. Sato and T. Sato and S. Seki and T. Shimogawa and T. Shinkawa and K. Shiomi and Son, {J. S.} and Y. Sugiyama and S. Suzuki and Y. Tajima and G. Takahashi and Y. Takashima and M. Tecchio and M. Togawa and T. Toyoda and Tung, {Y. C.} and Wah, {Y. W.} and H. Watanabe and Woo, {J. K.} and J. Xu and T. Yamanaka and Y. Yanagida and Yoshida, {H. Y.} and H. Yoshimoto",
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AU - Masuda, Takahiko

AU - Ahn, J. K.

AU - Banno, S.

AU - Campbell, M.

AU - Comfort, J.

AU - Duh, Y. T.

AU - Hineno, T.

AU - Hsiung, Y. B.

AU - Inagaki, T.

AU - Iwai, E.

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, J. W.

AU - Lee, S. K.

AU - Lim, G. Y.

AU - Ma, J.

AU - MacFarland, D.

AU - Maeda, Y.

AU - Matsumura, T.

AU - Murayama, R.

AU - Naito, D.

AU - Nakaya, Y.

AU - Nanjo, H.

AU - Nomura, T.

AU - Odani, Y.

AU - Okuno, H.

AU - Ri, Y. D.

AU - Sasao, Noboru

AU - Sato, K.

AU - Sato, T.

AU - Seki, S.

AU - Shimogawa, T.

AU - Shinkawa, T.

AU - Shiomi, K.

AU - Son, J. S.

AU - Sugiyama, Y.

AU - Suzuki, S.

AU - Tajima, Y.

AU - Takahashi, G.

AU - Takashima, Y.

AU - Tecchio, M.

AU - Togawa, M.

AU - Toyoda, T.

AU - Tung, Y. C.

AU - Wah, Y. W.

AU - Watanabe, H.

AU - Woo, J. K.

AU - Xu, J.

AU - Yamanaka, T.

AU - Yanagida, Y.

AU - Yoshida, H. Y.

AU - Yoshimoto, H.

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N2 - The KOTO (K at Tokai) experiment aims to observe the CP-violating rare decay KL → π→→ by using a long-lived neutral-kaon beam produced by the 30 GeV proton beam at the Japan Proton Accelerator Research Complex. The KL flux is an essential parameter for the measurement of the branching fraction. Three KL neutral decay modes, KL → 3p 0, KL → 2π, and KL → 2→, were used to measure the KL flux in the beam line in the 2013 KOTO engineering run. A Monte Carlo simulation was used to estimate the detector acceptance for these decays. Agreement was found between the simulation model and the experimental data, and the remaining systematic uncertainty was estimated at the 1.4% level. The KL flux was measured as (4.183 ± 0.017stat. ± 0.059sys.) × 107 KL per 2 × 1014 protons on a 66-mm-long Au target.

AB - The KOTO (K at Tokai) experiment aims to observe the CP-violating rare decay KL → π→→ by using a long-lived neutral-kaon beam produced by the 30 GeV proton beam at the Japan Proton Accelerator Research Complex. The KL flux is an essential parameter for the measurement of the branching fraction. Three KL neutral decay modes, KL → 3p 0, KL → 2π, and KL → 2→, were used to measure the KL flux in the beam line in the 2013 KOTO engineering run. A Monte Carlo simulation was used to estimate the detector acceptance for these decays. Agreement was found between the simulation model and the experimental data, and the remaining systematic uncertainty was estimated at the 1.4% level. The KL flux was measured as (4.183 ± 0.017stat. ± 0.059sys.) × 107 KL per 2 × 1014 protons on a 66-mm-long Au target.

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