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arxiv: 1207.5611 · v2 · submitted 2012-07-24 · ✦ hep-ex

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First observation of CP violation and improved measurement of the branching fraction and polarization of B0 -> D*+ D*- decays

Belle Collaboration: B. Kronenbitter , I. Adachi , H. Aihara , K. Arinstein , D. M. Asner , T. Aushev , T. Aziz , A. M. Bakich
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M. Barrett K. Belous V. Bhardwaj B. Bhuyan A. Bondar A. Bozek M. Bra\v{c}ko O. Brovchenko T. E. Browder V. Chekelian A. Chen P. Chen B. G. Cheon R. Chistov I.-S. Cho K. Cho Y. Choi J. Dalseno Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy S. Eidelman S. Esen J. E. Fast M. Feindt V. Gaur N. Gabyshev Y. M. Goh J. Haba H. Hayashii Y. Horii Y. Hoshi W.-S. Hou Y. B. Hsiung T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwabuchi Y. Iwasaki T. Julius J. H. Kang P. Kapusta T. Kawasaki C. Kiesling H. J. Kim H. O. Kim J. B. Kim J. H. Kim K. T. Kim M. J. Kim Y. J. Kim K. Kinoshita B. R. Ko S. Koblitz P. Kody\v{s} S. Korpar R. T. Kouzes P. Kri\v{z}an P. Krokovny T. Kuhr R. Kumar T. Kumita Y.-J. Kwon S.-H. Lee J. Li Y. Li J. Libby Y. Liu Z. Q. Liu D. Liventsev R. Louvot S. McOnie K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty D. Mohapatra A. Moll E. Nakano M. Nakao S. Neubauer C. Ng S. Nishida K. Nishimura O. Nitoh T. Ohshima S. Okuno S. L. Olsen Y. Onuki H. Ozaki P. Pakhlov G. Pakhlova C. W. Park H. Park H. K. Park R. Pestotnik M. Petri\v{c} L. E. Piilonen M. Prim M. Ritter M. R\"ohrken S. Ryu H. Sahoo Y. Sakai S. Sandilya L. Santelj T. Sanuki O. Schneider C. Schwanda A. J. Schwartz K. Senyo M. E. Sevior M. Shapkin C. P. Shen T.-A. Shibata J.-G. Shiu A. Sibidanov F. Simon P. Smerkol Y.-S. Sohn A. Sokolov E. Solovieva S. Stani\v{c} M. Stari\v{c} M. Sumihama K. Sumisawa T. Sumiyoshi G. Tatishvili Y. Teramoto K. Trabelsi T. Tsuboyama M. Uchida S. Uehara T. Uglov Y. Unno S. Uno Y. Usov P. Vanhoefer G. Varner K. E. Varvell V. Vorobyev C. H. Wang P. Wang Y. Watanabe K. M. Williams E. Won B. D. Yabsley J. Yamaoka Y. Yamashita D. Zander V. Zhilich V. Zhulanov A. Zupanc
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classification ✦ hep-ex
keywords fractionbranchingviolationdecaysmeasurementparameterspolarizationadditionally
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We report the measurement of the branching fraction, the polarization, and the parameters of the time-dependent CP violation in B0 -> D*+ D*- decays using a data sample of 772 million BB pairs, collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain a branching fraction of B = (7.82 +- 0.38 +- 0.63) x10^{-4}, a CP-odd fraction of R_\perp = 0.138 +- 0.024 +- 0.006 and, additionally, a fraction of the longitudinal component in the transversity base of R_0 = 0.624 +- 0.029 +- 0.011. The measured values of the parameters of the CP violation are S_{D*+ D*-} = -0.79 +- 0.13 +- 0.03 and A_{D*+ D*-} = 0.15 +- 0.08 +- 0.04.

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