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Title: Search for CP Violation in {tau}{sup {+-}}{yields}K{sub S}{sup 0}{pi}{sup {+-}}{nu}{sub {tau}} Decays at Belle

Abstract

We report on a search for CP violation in {tau}{sup {+-}}{yields}K{sub S}{sup 0}{pi}{sup {+-}}{nu}{sub {tau}} decays using a data sample of 699 fb{sup -1} collected by the Belle experiment at the KEKB electron-positron asymmetric-energy collider. The CP asymmetry is measured in four bins of the invariant mass of the K{sub S}{sup 0}{pi}{sup {+-}} system and found to be compatible with zero with a precision of O(10{sup -3}) in each mass bin. Limits for the CP violation parameter Im({eta}{sub S}) are given at the 90% confidence level. These limits are |Im({eta}{sub S})|<0.026 or better, depending on the parametrization used to describe the hadronic form factors, and improve upon previous limits by 1 order of magnitude.

Authors:
; ;  [1]; ;  [2];  [3]; ; ; ; ; ;  [4];  [5]; ;  [6]; ; ; ; ;  [7] more »;  [8] « less
  1. Nara Women's University, Nara (Japan)
  2. H. Niewodniczanski Institute of Nuclear Physics, Krakow (Poland)
  3. Department of Physics, University of Tokyo, Tokyo (Japan)
  4. Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
  5. (Russian Federation)
  6. School of Physics, University of Sydney, NSW 2006 (Australia)
  7. Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)
  8. University of Melbourne, School of Physics, Victoria 3010 (Australia)
Publication Date:
OSTI Identifier:
21611781
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevLett.107.131801; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CP INVARIANCE; FORM FACTORS; KAONS NEUTRAL SHORT-LIVED; MASS; PARTICLE DECAY; PARTICLE PRODUCTION; PIONS MINUS; PIONS PLUS; TAU NEUTRINOS; BOSONS; DECAY; DIMENSIONLESS NUMBERS; ELEMENTARY PARTICLES; FERMIONS; HADRONS; HEAVY LEPTONS; INVARIANCE PRINCIPLES; KAONS; KAONS NEUTRAL; LEPTONS; MASSLESS PARTICLES; MESONS; NEUTRINOS; PARTICLE PROPERTIES; PIONS; PSEUDOSCALAR MESONS; STRANGE MESONS; STRANGE PARTICLES

Citation Formats

Bischofberger, M., Hayashii, H., Miyabayashi, K., Adamczyk, K., Bozek, A., Aihara, H., Aulchenko, V., Eidelman, S., Epifanov, D., Shwartz, B., Vinokurova, A., Zhulanov, V., Novosibirsk State University, Novosibirsk, Bakich, A. M., McOnie, S., Balagura, V., Danilov, M., Mizuk, R., Pakhlova, G., Uglov, T., and Barberio, E. Search for CP Violation in {tau}{sup {+-}}{yields}K{sub S}{sup 0}{pi}{sup {+-}}{nu}{sub {tau}} Decays at Belle. United States: N. p., 2011. Web. doi:10.1103/PHYSREVLETT.107.131801.
Bischofberger, M., Hayashii, H., Miyabayashi, K., Adamczyk, K., Bozek, A., Aihara, H., Aulchenko, V., Eidelman, S., Epifanov, D., Shwartz, B., Vinokurova, A., Zhulanov, V., Novosibirsk State University, Novosibirsk, Bakich, A. M., McOnie, S., Balagura, V., Danilov, M., Mizuk, R., Pakhlova, G., Uglov, T., & Barberio, E. Search for CP Violation in {tau}{sup {+-}}{yields}K{sub S}{sup 0}{pi}{sup {+-}}{nu}{sub {tau}} Decays at Belle. United States. doi:10.1103/PHYSREVLETT.107.131801.
Bischofberger, M., Hayashii, H., Miyabayashi, K., Adamczyk, K., Bozek, A., Aihara, H., Aulchenko, V., Eidelman, S., Epifanov, D., Shwartz, B., Vinokurova, A., Zhulanov, V., Novosibirsk State University, Novosibirsk, Bakich, A. M., McOnie, S., Balagura, V., Danilov, M., Mizuk, R., Pakhlova, G., Uglov, T., and Barberio, E. Fri . "Search for CP Violation in {tau}{sup {+-}}{yields}K{sub S}{sup 0}{pi}{sup {+-}}{nu}{sub {tau}} Decays at Belle". United States. doi:10.1103/PHYSREVLETT.107.131801.
@article{osti_21611781,
title = {Search for CP Violation in {tau}{sup {+-}}{yields}K{sub S}{sup 0}{pi}{sup {+-}}{nu}{sub {tau}} Decays at Belle},
author = {Bischofberger, M. and Hayashii, H. and Miyabayashi, K. and Adamczyk, K. and Bozek, A. and Aihara, H. and Aulchenko, V. and Eidelman, S. and Epifanov, D. and Shwartz, B. and Vinokurova, A. and Zhulanov, V. and Novosibirsk State University, Novosibirsk and Bakich, A. M. and McOnie, S. and Balagura, V. and Danilov, M. and Mizuk, R. and Pakhlova, G. and Uglov, T. and Barberio, E.},
abstractNote = {We report on a search for CP violation in {tau}{sup {+-}}{yields}K{sub S}{sup 0}{pi}{sup {+-}}{nu}{sub {tau}} decays using a data sample of 699 fb{sup -1} collected by the Belle experiment at the KEKB electron-positron asymmetric-energy collider. The CP asymmetry is measured in four bins of the invariant mass of the K{sub S}{sup 0}{pi}{sup {+-}} system and found to be compatible with zero with a precision of O(10{sup -3}) in each mass bin. Limits for the CP violation parameter Im({eta}{sub S}) are given at the 90% confidence level. These limits are |Im({eta}{sub S})|<0.026 or better, depending on the parametrization used to describe the hadronic form factors, and improve upon previous limits by 1 order of magnitude.},
doi = {10.1103/PHYSREVLETT.107.131801},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 13,
volume = 107,
place = {United States},
year = {2011},
month = {9}
}