Chao, Y;
Chang, P;
Abe, K;
Abe, K;
Abe, N;
Adachi, I;
Aihara, H;
... Belle Collaboration, .; + view all
(2004)
Evidence for direct CP violation in B-0 -> K+pi(-) decays.
PHYS REV LETT
, 93
(19)
, Article 191802. 10.1103/PhysRevLett.93.191802.
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Abstract
We report evidence for direct CP violation in the decay B-0-->K(+)pi(-) with 253 fb(-1) of data collected with the Belle detector at the KEKB e(+)e(-) collider. Using 275x10(6) B(B) over bar pairs we observe a B-->K(+/-)pi(-/+) signal with 2140+/-53 events. The measured CP violating asymmetry is A(CP)(K(+)pi(-))=-0.101+/-0.025(stat)+/-0.005(syst), corresponding to a significance of 3.9sigma including systematics. We also search for CP violation in the decays B+-->K(+)pi(0) and B+-->pi(+)pi(0). The measured CP violating asymmetries are A(CP)(K(+)pi(0))=0.04+/-0.05(stat)+/-0.02(syst) and A(CP)(pi(+)pi(0))=-0.02+/-0.10(stat)+/-0.01(syst), corresponding to the intervals -0.05< A(CP)(K(+)pi(0))<0.13 and -0.18< A(CP)(pi(+)pi(0))<0.14 at 90% confidence level.
| Type: | Article |
|---|---|
| Title: | Evidence for direct CP violation in B-0 -> K+pi(-) decays |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.93.191802 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.93.191802 |
| Language: | English |
| Additional information: | © 2004 The American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1308448 |
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