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Evidence for direct CP violation in B0-->K+pi- decays |
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| Authors: | Chao Y Chang P Abe K Abe K Abe N Adachi I Aihara H Akai K Akatsu M Akemoto M Asano Y Aso T Aulchenko V Aushev T Aziz T Bahinipati S Bakich A M Ban Y Barbero M Bay A Bedny I Bitenc U Bizjak I Blyth S Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang M-C Chen A Chen K-F Chen W T Cheon B G Chistov R Choi S-K Choi Y Choi Y K Chuvikov A Cole S Danilov M Dash M Dong L Y Dowd R Dragic J Drutskoy A Eidelman S Eiges V Enari Y Epifanov D Everton C W Fang F Flanagan J Fratina S Fujii H Funakoshi Y Furukawa K Gabyshev N Garmash A Gershon T Go A Gokhroo G Golob B Grosse Perdekamp M Guler H Guo R |
| Institution: | Department of Physics, National Taiwan University, Taipei. |
| Abstract: | We report evidence for direct CP violation in the decay B0-->K+pi(-) with 253 fb(-1) of data collected with the Belle detector at the KEKB e(+)e(-) collider. Using 275x10(6) BB 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 |
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