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

The KOTO(K 0 at Tokai) experiment aims to observe the CP-violating rare decay K L → π 0νν¯ over bar by using a long-lived neutral-kaon beam produced by the 30 GeV proton beam at the Japan Proton Accelerator Research Complex. The K L flux is an essential parameter for the measurement of the branching fraction. Three K L neutral decay modes, K L → 3 π 0, K L → 2 π 0, and K L → 2γ, were used to measure the K L 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. Here, the K L flux was measured as (4.183 ± 0.017 stat. ± 0.059 sys.) x 10 7 K L per 2 x 10 14 protons on a 66-mm-long Au target.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [6] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [12] ;  [8] ;  [13] ;  [11] ;  [14] ;  [11] ;  [8] more »;  [15] ;  [5] ;  [16] ;  [17] ;  [18] ;  [10] ;  [18] ;  [10] ;  [8] ;  [19] ;  [8] ;  [20] ;  [21] ;  [22] ;  [8] ;  [10] ;  [23] ;  [17] ;  [9] ;  [11] ;  [18] ;  [24] ;  [25] ;  [10] ;  [26] ;  [4] ;  [18] ;  [27] ;  [28] ;  [29] ;  [8] ;  [12] ;  [30] ;  [18] ;  [31] ;  [25] ;  [32] « less
  1. Kyoto Univ., Kyoto (Japan); Okayama Univ., Okayama (Japan)
  2. Korea Univ., Seoul (Republic of Korea)
  3. Osaka Univ., Osaka (Japan); Canon IT Solutions, Inc., Tokyo (Japan)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
  5. Arizona State Univ., Tempe, AZ (United States)
  6. National Taiwan Univ., Taiwan (Republic of China)
  7. Kyoto Univ., Kyoto (Japan); Fujitsu FIP Corp., Tokyo (Japan)
  8. High Energy Accelerator Research Organization (KEK), Ibaraki (Japan)
  9. Osaka Univ., Osaka (Japan); High Energy Accelerator Research Organization (KEK), Ibaraki (Japan)
  10. Kyoto Univ., Kyoto (Japan)
  11. Chonbuk National Univ., Jeonju (Republic of Korea)
  12. Jeju National Univ., Jeju (Republic of Korea)
  13. Joint Institute for Nuclear Researches, Dubna (Russia)
  14. Osaka Univ., Osaka (Japan); Korea Univ., Seoul (Republic of Korea)
  15. Univ. of Chicago, Chicago, IL (United States); Mayo Clinic, Rochester, MN (United States)
  16. Kyoto Univ., Kyoto (Japan); Nagoya Univ., Nagoya (Japan)
  17. National Defense Academy, Kanagawa (Japan)
  18. Osaka Univ., Osaka (Japan)
  19. Saga Univ., Saga (Japan); JASTEC Co., Ltd., Tokyo (Japan)
  20. Osaka Univ., Osaka (Japan); Hitachi Industry and Control Solutions, Ltd., Ibaraki (Japan)
  21. Okayama Univ., Okayama (Japan)
  22. Osaka Univ., Osaka (Japan); Univ. of Tokyo, Chiba (Japan)
  23. Saga Univ., Saga (Japan); High Energy Accelerator Research Organization (KEK), Ibaraki (Japan)
  24. Saga Univ., Saga (Japan)
  25. Yamagata Univ., Yamagata (Japan)
  26. Osaka Univ., Osaka (Japan); Gigaphoton Inc., Tochigi (Japan)
  27. Osaka Univ., Osaka (Japan); Hitachi, Ltd., Tokyo (Japan)
  28. National Taiwan Univ., Taiwan (Republic of China); Univ. of Chicago, Chicago, IL (United States)
  29. Univ. of Chicago, Chicago, IL (United States)
  30. Univ. of Michigan, Ann Arbor, MI (United States); Apple Inc., Cupertino, CA (United States)
  31. Osaka Univ., Osaka (Japan); Shimadzu Corp., Kyoto (Japan)
  32. Osaka Univ., Osaka (Japan); Resona Bank, Ltd., Osaka (Japan)
Publication Date:
Type:
Accepted Manuscript
Journal Name:
Progress of Theoretical and Experimental Physics
Additional Journal Information:
Journal Volume: 2016; Journal Issue: 1; Journal ID: ISSN 2050-3911
Publisher:
Physical Society of Japan
Research Org:
Office of Scientific and Technical Information, Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1375939