Evidence for CP violation in B0-->D+D- decays.

Evidence for CP violation in B0-->D+D- decays.
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DOI：
10.1103/physrevlett.98.221802
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发表时间：
2007-02
期刊：
Physical review letters
影响因子：
8.6
通讯作者：
S. Fratina;K. Abe;I. Adachi;H. Aihara;D. Anipko;K. Arinstein;T. Aushev;A. Bakich;E. Barberio;A. Bay;K. Belous;U. Bitenc;I. Bizjak;A. Bondar;A. Bozek;M. Bračko;J. Brodzicka;T. Browder;M. Chang;P. Chang;Y. Chao;A. Chen;K.F. Chen;W. Chen;B. Cheon;R. Chistov;Y. Choi;Y. Choi;S. Cole;J. Dalseno;M. Dash;A. Drutskoy;S. Eidelman;A. Go;B. Golob;A. Gorišek;H. Ha;J. Haba;K. Hara;M. Hazumi;D. Heffernan;T. Hokuue;Y. Hoshi;W. Hou;T. Iijima;K. Inami;A. Ishikawa;H. Ishino;R. Itoh;M. Iwasaki;Y. Iwasaki;H. Kaji;J. Kang;N. Katayama;H. Kawai;T. Kawasaki;H. Kichimi;H. Kim;H. Kim;S. Kim;Y. Kim;K. Kinoshita;S. Korpar;P. Križan;P. Krokovny;R. Kulasiri;R. Kumar;C. Kuo;A. Kuzmin;Y. Kwon;M. Lee;S. Lee;T. Lesiak;A. Limosani;S. Lin;D. Liventsev;F. Mandl;T. Matsumoto;A. Matyja;S. Mconie;T. Medvedeva;W. Mitaroff;K. Miyabayashi;H. Miyake;H. Miyata;Y. Miyazaki;R. Mizuk;G. Moloney;T. Mori;E. Nakano;M. Nakao;H. Nakazawa;S. Nishida;S. Noguchi;S. Ogawa;T. Ohshima;S. Okuno;S. Olsen;Y. Onuki;H. Ozaki;P. Pakhlov;G. Pakhlova;C. Park;H. Park;L. Peak;R. Pestotnik;L. Piilonen;Y. Sakai;N. Satoyama;T. Schietinger;O. Schneider;J. Schümann;C. Schwanda;A. Schwartz;K. Senyo;M. Sevior;M. Shapkin;H. Shibuya;B. Shwartz;J. Singh;A. Somov;N. Soni;S. Stanič;M. Starič;H. Stoeck;T. Sumiyoshi;F. Takasaki;K. Tamai;M. Tanaka;Y. Teramoto;X. Tian;I. Tikhomirov;K. Trabelsi;T. Tsukamoto;S. Uehara;K. Ueno;T. Uglov;Y. Unno;S. Uno;P. Urquijo;Y. Usov;G. Varner;K. Varvell;K. Vervink;S. Villa;C. Wang;Y. Watanabe;E. Won;B. Yabsley;A. Yamaguchi;Y. Yamashita;M. Yamauchi;C. Zhang;Z. Zhang;V. Zhilich;A. Zupanc
S. Fratina;K. Abe;I. Adachi;H. Aihara;D. Anipko;K. Arinstein;T. Aushev;A. Bakich;E. Barberio;A. Bay;K. Belous;U. Bitenc;I. Bizjak;A. Bondar;A. Bozek;M. Bračko;J. Brodzicka;T. Browder;M. Chang;P. Chang;Y. Chao;A. Chen;K.F. Chen;W. Chen;B. Cheon;R. Chistov;Y. Choi;Y. Choi;S. Cole;J. Dalseno;M. Dash;A. Drutskoy;S. Eidelman;A. Go;B. Golob;A. Gorišek;H. Ha;J. Haba;K. Hara;M. Hazumi;D. Heffernan;T. Hokuue;Y. Hoshi;W. Hou;T. Iijima;K. Inami;A. Ishikawa;H. Ishino;R. Itoh;M. Iwasaki;Y. Iwasaki;H. Kaji;J. Kang;N. Katayama;H. Kawai;T. Kawasaki;H. Kichimi;H. Kim;H. Kim;S. Kim;Y. Kim;K. Kinoshita;S. Korpar;P. Križan;P. Krokovny;R. Kulasiri;R. Kumar;C. Kuo;A. Kuzmin;Y. Kwon;M. Lee;S. Lee;T. Lesiak;A. Limosani;S. Lin;D. Liventsev;F. Mandl;T. Matsumoto;A. Matyja;S. Mconie;T. Medvedeva;W. Mitaroff;K. Miyabayashi;H. Miyake;H. Miyata;Y. Miyazaki;R. Mizuk;G. Moloney;T. Mori;E. Nakano;M. Nakao;H. Nakazawa;S. Nishida;S. Noguchi;S. Ogawa;T. Ohshima;S. Okuno;S. Olsen;Y. Onuki;H. Ozaki;P. Pakhlov;G. Pakhlova;C. Park;H. Park;L. Peak;R. Pestotnik;L. Piilonen;Y. Sakai;N. Satoyama;T. Schietinger;O. Schneider;J. Schümann;C. Schwanda;A. Schwartz;K. Senyo;M. Sevior;M. Shapkin;H. Shibuya;B. Shwartz;J. Singh;A. Somov;N. Soni;S. Stanič;M. Starič;H. Stoeck;T. Sumiyoshi;F. Takasaki;K. Tamai;M. Tanaka;Y. Teramoto;X. Tian;I. Tikhomirov;K. Trabelsi;T. Tsukamoto;S. Uehara;K. Ueno;T. Uglov;Y. Unno;S. Uno;P. Urquijo;Y. Usov;G. Varner;K. Varvell;K. Vervink;S. Villa;C. Wang;Y. Watanabe;E. Won;B. Yabsley;A. Yamaguchi;Y. Yamashita;M. Yamauchi;C. Zhang;Z. Zhang;V. Zhilich;A. Zupanc
中科院分区：
物理与天体物理1区
文献类型：
--
作者：
S. Fratina;K. Abe;I. Adachi;H. Aihara;D. Anipko;K. Arinstein;T. Aushev;A. Bakich;E. Barberio;A. Bay;K. Belous;U. Bitenc;I. Bizjak;A. Bondar;A. Bozek;M. Bračko;J. Brodzicka;T. Browder;M. Chang;P. Chang;Y. Chao;A. Chen;K.F. Chen;W. Chen;B. Cheon;R. Chistov;Y. Choi;Y. Choi;S. Cole;J. Dalseno;M. Dash;A. Drutskoy;S. Eidelman;A. Go;B. Golob;A. Gorišek;H. Ha;J. Haba;K. Hara;M. Hazumi;D. Heffernan;T. Hokuue;Y. Hoshi;W. Hou;T. Iijima;K. Inami;A. Ishikawa;H. Ishino;R. Itoh;M. Iwasaki;Y. Iwasaki;H. Kaji;J. Kang;N. Katayama;H. Kawai;T. Kawasaki;H. Kichimi;H. Kim;H. Kim;S. Kim;Y. Kim;K. Kinoshita;S. Korpar;P. Križan;P. Krokovny;R. Kulasiri;R. Kumar;C. Kuo;A. Kuzmin;Y. Kwon;M. Lee;S. Lee;T. Lesiak;A. Limosani;S. Lin;D. Liventsev;F. Mandl;T. Matsumoto;A. Matyja;S. Mconie;T. Medvedeva;W. Mitaroff;K. Miyabayashi;H. Miyake;H. Miyata;Y. Miyazaki;R. Mizuk;G. Moloney;T. Mori;E. Nakano;M. Nakao;H. Nakazawa;S. Nishida;S. Noguchi;S. Ogawa;T. Ohshima;S. Okuno;S. Olsen;Y. Onuki;H. Ozaki;P. Pakhlov;G. Pakhlova;C. Park;H. Park;L. Peak;R. Pestotnik;L. Piilonen;Y. Sakai;N. Satoyama;T. Schietinger;O. Schneider;J. Schümann;C. Schwanda;A. Schwartz;K. Senyo;M. Sevior;M. Shapkin;H. Shibuya;B. Shwartz;J. Singh;A. Somov;N. Soni;S. Stanič;M. Starič;H. Stoeck;T. Sumiyoshi;F. Takasaki;K. Tamai;M. Tanaka;Y. Teramoto;X. Tian;I. Tikhomirov;K. Trabelsi;T. Tsukamoto;S. Uehara;K. Ueno;T. Uglov;Y. Unno;S. Uno;P. Urquijo;Y. Usov;G. Varner;K. Varvell;K. Vervink;S. Villa;C. Wang;Y. Watanabe;E. Won;B. Yabsley;A. Yamaguchi;Y. Yamashita;M. Yamauchi;C. Zhang;Z. Zhang;V. Zhilich;A. Zupanc

文献摘要

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我们测量了B（0）-->D+ D-衰变的分支分数和CP破坏参数.结果基于包含在Upsilon（4S）共振处收集的535 x 10（6）BB对的数据样本，其中使用KEKB非对称能量e+e-对撞机上的贝儿探测器。对于B 0->D+D-的分支分数，我们得到[1.97+/-0.20（stat）+/-0.20（syst）] x 10（-4）。CP破坏参数的测量值为S=-1.13+/-0.37+/-0.09，A=0.91+/-0.23+/-0.06，其中第一个误差是统计误差，第二个误差是系统误差。在4.1sigma置信水平下，我们发现了B 0-->D+D-中CP违反的证据。虽然S的值与其他测量的预期一致，但参数A的值在3.2sigma置信水平下有利于大的直接CP违背，这与标准模型的预期相反。
We report measurements of the branching fraction and CP violation parameters in B(0)-->D+ D- decays. The results are based on a data sample that contains 535 x 10(6) BB pairs collected at the Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain [1.97+/-0.20(stat) +/- 0.20(syst)] x 10(-4) for the branching fraction of B0-->D+D-. The measured values of the CP violation parameters are S=-1.13+/-0.37+/-0.09, A=0.91+/-0.23+/-0.06, where the first error is statistical and the second is systematic. We find evidence of CP violation in B0-->D+D- at the 4.1sigma confidence level. While the value of S is consistent with expectations from other measurements, the value of the parameter A favors large direct CP violation at the 3.2sigma confidence level, in contradiction to standard model expectations.