Published November 5, 2004
| Version v1
Journal article
Evidence for direct CP violation in B0→K+π-decays
Creators
- 1. Department of Physics, National Taiwan University, Taipei (China)
- 2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
Description
We report evidence for direct CP violation in the decay B0→K+π- with 253 fb-1 of data collected with the Belle detector at the KEKB e+e- collider. Using 275x106 BB-bar pairs we observe a B→K±π± signal with 2140±53 events. The measured CP violating asymmetry is ACP(K+π-)=-0.101±0.025(stat)±0.005(syst), corresponding to a significance of 3.9σ including systematics. We also search for CP violation in the decays B+→K+π0 and B+→π+π0. The measured CP violating asymmetries are ACP(K+π0)=0.04±0.05(stat)±0.02(syst) and ACP(π+π0)=-0.02±0.10(stat)±0.01(syst), corresponding to the intervals -0.05<ACP(K+π0)<0.13 and -0.18<ACP(π+π0)<0.14 at 90% confidence level
Additional details
Identifiers
- DOI
- 10.1103/PhysRevLett.93.191802;
- arXiv
- arXiv:hep-ex/0408100v2;
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 93
- Journal Issue
- 19
- Journal Page Range
- p. 191802-191802.6
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 36062807
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- ASYMMETRY; B NEUTRAL MESONS; CP INVARIANCE; HADRONIC PARTICLE DECAY; KAONS NEUTRAL; KAONS PLUS; PIONS MINUS; PIONS NEUTRAL; PIONS PLUS; SIGNALS
- Descriptors DEC
- B MESONS; BEAUTY MESONS; BEAUTY PARTICLES; BOSONS; DECAY; ELEMENTARY PARTICLES; HADRONS; INVARIANCE PRINCIPLES; KAONS; MESONS; PARTICLE DECAY; PIONS; PSEUDOSCALAR MESONS; STRANGE MESONS; STRANGE PARTICLES
Optional Information
- Notes
- (c) 2004 The American Physical Society
- Collaborations
- Belle Collaboration