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

B. Kronenbitter,Ichiro Adachi,Hiroaki Aihara,K. E. Arinstein,David M. Asner,Tagir A Kh Aushev,T. Aziz,A. M. Bakich,Matthew Barrett,K. S. Belous,V. N. Bhardwaj,Bipul Bhuyan,Alex E. Bondar,Andrzej Bozek,Marko Bračko,O. Brovchenko,Thomas E. Browder,Vladimir Chekelian,Augustine E. Chen,Pisin Chen,Byunggu Cheon,Ruslan N. Chistov,Insung Cho,Kwangsoo Cho,Yoonsuk Choi,J. P. Dalseno,Zdeněk Doležal,Z. Drásal,Alexey G. Drutskoy,Simon I. Eidelman,Selda Esen,James E. Fast,Michael Feindt,V. Gaur,N. I. Gabyshev,Y. M. Goh,Junji Haba,Hisaki Hayashii,Y. Horii,Yoshimoto Hoshi,Weishu Hou,Y. B. Hsiung,T. Iijima,Kenji Inami,Akimasa Ishikawa,Ryosuke Itoh,Masaya Iwabuchi,Y. Iwasaki,T. Danger Julius,Joohoon Kang,Piotr J. Kapusta,T. Kawasaki,Ch M. Kíesling,Hongju Kim,Hyunok Kim,Jungbae Kim,Junghyun Kim,K. T. Kim,Maengjun Kim,Youngjin Kim,K. Kinoshita,Byeongrok Ko,S. Koblitz,Peter Kodyš,Samo Korpar,Richard T. Kouzes,Peter Križan,Pavel P. Krokovny,Thomas Kuhr,R. Kumar,Tetsuro Kumita,Youngjoon Kwon,Soohyung Lee,Jaeho Li,Yanxi Li,Jim F. Libby,Yong Liu,Zhiqiang Liu,D. Liventsev,Remi Louvot,S. McOnie,Kenkichi Miyabayashi,Hitoshi Miyata,Roman V. Mizuk,Gagan B. Mohanty,Debabrata K. Mohapatra,Andreas Moll,Eiichi Nakano,M. Nakao,S. Neubauer,Chu Ng,Shohei Nishida,Kurtis Nishimura,Osamu Nitoh,Takayoshi Ohshima,Shoji Okuno,Stephen Lars Olsen,Y. Onuki,H. Ozaki,P. N. Pakhlov,Galina V. Pakhlova,C. W. Park,H. K. Park,HyangKyu Park,Rok Pestotnik,M. Petrič,Leo E. Piilonen,M. Prim,Michael W. Ritter,Markus Röhrken,S. Ryu,Himansu Sahoo,Yoshihide Sakai,S. Sandilya,Luka Šantelj,Tomoyuki Sanuki,Olivier Schneider,Christoph Schwanda,A. J. Schwartz,K. Senyo,Martin E. Sevior,M. M. Shapkin,Chengping Shen,Toshiaki Shibata,J. G. Shiu,Alexei L. Sibidanov,Frank Simon,P. Smerkol,Y. S. Sohn,Anatoli A. Sokolov,Elena N. Solovieva,Samo Stanič,Marko Starič,Mizuki Sumihama,K. Sumisawa,Takayuki Sumiyoshi,G. Tatishvili,Yoshiki Teramoto,Karim Trabelsi,Toru Tsuboyama,Makoto Uchida,Sadaharu Uehara,T. Uglov,Yuuji Unno,Shoji Uno,Yu V. Usov,P. Vanhoefer,Gary S. Varner,K. E. Varvell,V. Vorobyev,Chunghsiang Wang,Ping Wang,Yoshio Watanabe,Kerry M. Williams,Eunil Won,B. D. Yabsley,Jared Yamaoka,Yousuke Yamashita,D. Zander,Victor N. Zhilich,Vladimir V. Zhulanov,A. Zupanc

PHYSICAL REVIEW D（2012）

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摘要

We report the measurement of the branching fraction, the polarization, and the parameters of the time-dependent CP violation in B-0 -> D*(+) D*(-) decays using a data sample of 772 x 10(6)B (B) over bar pairs, collected at the Upsilon(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) x 10(-4), a CP-odd fraction of R-perpendicular to = 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 SD*+ D*- = 0.79 +/- 0.13 +/- 0.03 and A(D*+ D*-) 0.15 +/- 0.08 +/- 0.04.

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

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