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

Journal Article · Fri Sep 23 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.107.131801· OSTI ID:21611781

Bischofberger, M; Hayashii, H; Miyabayashi, K ^[1]; Adamczyk, K; Bozek, A ^[2]; Aihara, H ^[3]; Aulchenko, V; Eidelman, S; Epifanov, D; Shwartz, B; Vinokurova, A; Zhulanov, V ^[4]; Bakich, A M; McOnie, S ^[5]; Balagura, V; Danilov, M; Mizuk, R; Pakhlova, G; Uglov, T ^[6]; Barberio, E ^[7]

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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. School of Physics, University of Sydney, NSW 2006 (Australia)
6. Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)
7. University of Melbourne, School of Physics, Victoria 3010 (Australia)

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.

• OSTI ID: 21611781
• Journal Information: Physical Review Letters, Vol. 107, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.107.131801; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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