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arxiv 1205.5957 v2 pith:F4STRP3B submitted 2012-05-27 hep-ex

Measurement of Branching Fraction and First Evidence of CP Violation in B0 --> a1+-(1260) pi-+ Decays

Belle Collaboration: J. Dalseno , I. Adachi , H. Aihara , D. M. Asner , V. Aulchenko , T. Aushev , A. M. Bakich , A. Bay
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K. Belous B. Bhuyan A. Bozek M. Bra\v{c}ko O. Brovchenko T. E. Browder V. Chekelian A. Chen P. Chen B. G. Cheon K. Chilikin R. Chistov I.-S. Cho K. Cho Y. Choi Z. Dole\v{z}al Z. Dr\'asal S. Eidelman J. E. Fast V. Gaur N. Gabyshev A. Garmash Y. M. Goh H. Hayashii Y. Horii Y. Hoshi W.-S. Hou Y. B. Hsiung H. J. Hyun T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwabuchi Y. Iwasaki T. Iwashita T. Julius J. H. Kang C. Kiesling H. O. Kim J. B. Kim Y. J. Kim K. Kinoshita B. R. Ko S. Koblitz P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny B. Kronenbitter T. Kuhr T. Kumita Y.-J. Kwon S.-H. Lee J. Li J. Libby C. Liu Z. Q. Liu R. Louvot J. MacNaughton D. Matvienko S. McOnie K. Miyabayashi H. Miyata Y. Miyazaki G. B. Mohanty D. Mohapatra A. Moll N. Muramatsu M. Nakao Z. Natkaniec E. Nedelkovska C. Ng S. Nishida K. Nishimura O. Nitoh S. Ogawa T. Ohshima S. Okuno P. Pakhlov G. Pakhlova C. W. Park H. K. Park T. K. Pedlar R. Pestotnik M. Petri\v{c} L. E. Piilonen M. Prim K. Prothmann M. Ritter M. R\"ohrken H. Sahoo Y. Sakai T. Sanuki O. Schneider C. Schwanda A. J. Schwartz K. Senyo O. Seon M. E. Sevior M. Shapkin V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu A. Sibidanov F. Simon P. Smerkol Y.-S. Sohn E. Solovieva M. Stari\v{c} M. Sumihama T. Sumiyoshi G. Tatishvili Y. Teramoto K. Trabelsi M. Uchida S. Uehara Y. Unno S. Uno P. Urquijo Y. Usov P. Vanhoefer G. Varner C. H. Wang P. Wang M. Watanabe Y. Watanabe K. M. Williams E. Won B. D. Yabsley Y. Yamashita Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc
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classification hep-ex
keywords violationbranchingdecaysevidencefractionmeasurementdirectfinal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a measurement of the branching fraction and time-dependent CP violation parameters in B0 --> a_1^+-(1260) pi^-+ decays. The results are obtained from the final data sample containing 772x10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We also measure an upper limit on the product branching fraction for a possible decay with the same final state B0 --> a_2^+-(1320) pi^-+. In a time-dependent measurement to extract CP asymmetries, we find evidence of mixing-induced CP violation in B0 --> a_1^+-(1260) pi^-+ decays with a 3.1 sigma significance and the rate where the a_1^+-(1260) does not contain the spectator quark is found to dominate the rate where it does at the 4.1 sigma level. However, there is no evidence for either time and flavor integrated direct CP violation or flavor-dependent direct CP violation.

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