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Study of CP-violating asymmetries in B0-->pi(+)pi(-) decays |
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| Authors: | Abe K Abe K Abe T Adachi I Ahn Byoung Sup Aihara H Akatsu M Asano Y Aso T Aulchenko V Aushev T Bakich A M Ban Y Banas E Bedny I Behari S Behera P K Bondar A Bozek A Bracko M Brodzicka J Browder T E Casey B C K Chang P Chao Y Cheon B G Chistov R Choi S-K Choi Y Danilov M Dong L Y Dragic J Drutskoy A Eidelman S Eiges V Enari Y Everton C W Fang F Fujii H Fukunaga C Fukushima M Gabyshev N Garmash A Gershon T Golob B Gordon A Guo R Haba J Hamasaki H Hanagaki K Handa F Hara K Hara T Hastings N C Hayashii H Hazumi M Heenan E M Higuchi I Higuchi T Hojo T Hokuue T Hoshi Y Hoshina K Hou S R Hou W-S |
| Institution: | High Energy Accelerator Research Organization (KEK), Tsukuba. |
| Abstract: | We present a measurement of CP-violating asymmetries in B0-->pi(+)pi(-) decays based on a 41.8 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We fully reconstruct one neutral B meson as a B0-->pi(+)pi(-) CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain the CP-violating asymmetry parameters S(pipi)=-1.21(+0.38)(-0.27)(stat)+0.16-0.13(syst) and A(pipi)=+0.94(+0.25)(-0.31)(stat)+/-0.09(syst). |
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