Improved constraints on D0-D0 mixing in D0 --> K+ pi- decays from the Belle detector.
Improved constraints on D0-D0 mixing in D0 --> K+ pi- decays from the Belle detector.
复制标题
改进了对来自 Belle 检测器的 D0 --> K pi 衰减中的 D0-D0 混合的约束。
DOI：
10.1103/physrevlett.96.151801
复制
发表时间：
2006
影响因子：
8.6
通讯作者：
D. Zürcher
中科院分区：
文献类型：
--
作者：
L. Zhang;Z. Zhang;J. Li;K. Abe;I. Adachi;H. Aihara;D. Anipko;K. Arinstein;Y. Asano;T. Aushev;S. Bahinipati;A. Bakich;V. Balagura;M. Barbero;A. Bay;I. Bedny;K. Belous;U. Bitenc;I. Bizjak;S. Blyth;A. Bondar;A. Bozek;M. Bračko;J. Brodzicka;T. Browder;M. Chang;P. Chang;Y. Chao;A. Chen;W. Chen;B. Cheon;R. Chistov;S. Choi;Y. Choi;Y. Choi;A. Chuvikov;S. Cole;J. Dalseno;M. Danilov;M. Dash;A. Drutskoy;S. Eidelman;N. Gabyshev;T. Gershon;A. Go;G. Gokhroo;B. Golob;A. Gorišek;H. Ha;J. Haba;T. Hara;N. Hastings;K. Hayasaka;H. Hayashii;M. Hazumi;Y. Hoshi;S. Hou;W. Hou;Y. Hsiung;T. Iijima;K. Ikado;K. Inami;A. Ishikawa;H. Ishino;R. Itoh;M. Iwasaki;Y. Iwasaki;J. Kang;P. Kapusta;N. Katayama;H. Kawai;T. Kawasaki;H. Kichimi;H. Kim;S. Kim;S. Kim;K. Kinoshita;S. Korpar;P. Križan;P. Krokovny;R. Kulasiri;R. Kumar;C. Kuo;A. Kuzmin;Y. Kwon;G. Leder;J. Lee;T. Lesiak;S. Lin;D. Liventsev;F. Mandl;T. Matsumoto;Y. Mikami;W. Mitaroff;K. Miyabayashi;H. Miyake;H. Miyata;Y. Miyazaki;R. Mizuk;D. Mohapatra;Takashi Mori;M. Nakao;Z. Natkaniec;S. Nishida;O. Nitoh;T. Nozaki;S. Ogawa;T. Ohshima;T. Okabe;S. Okuno;S. Olsen;W. Ostrowicz;H. Ozaki;C. Park;H. Park;R. Pestotnik;L. Piilonen;Y. Sakai;N. Sato;N. Satoyama;T. Schietinger;O. Schneider;C. Schwanda;A. Schwartz;R. Seidl;K. Senyo;M. Sevior;M. Shapkin;H. Shibuya;B. Shwartz;J. Singh;A. Sokolov;A. Somov;N. Soni;R. Stamen;S. Stanič;M. Starič;K. Sumisawa;T. Sumiyoshi;S. Suzuki;F. Takasaki;K. Tamai;N. Tamura;M. Tanaka;G. Taylor;Y. Teramoto;X. Tian;K. Trabelsi;T. Tsuboyama;T. Tsukamoto;S. Uehara;T. Uglov;K. Ueno;Y. Unno;S. Uno;P. Urquijo;Y. Usov;G. Varner;S. Villa;C. Wang;C. H. Wang;Y. Watanabe;E. Won;Q. Xie;B. Yabsley;A. Yamaguchi;M. Yamauchi;J. Ying;Y. Yuan;C. Zhang;J. Zhang;V. Zhilich;D. Zürcher
我们报告了在D0→K + π - 衰变中寻找D0 - D0混合的结果，该结果基于KEKB的贝尔探测器所积累的400 fb⁻¹的数据。在假定CP守恒以及允许CP破坏这两种情况下，我们对混合参数x和y以及参数R(D)（双卡比博压低衰变与卡比博有利衰变的比率）的衰变时间分布进行拟合。使用频率论方法得到了(x'²,y')平面上95%置信水平区域。假定CP守恒，我们在95%置信水平下发现x'² < 0.72×10⁻³且 - 9.9×10⁻³ < y' < 6.8×10⁻³；这些是迄今为止对混合参数最严格的限制。无混合点(0,0)的置信水平为3.9%。假定无混合，我们测量得到R(D) = (0.377 ± 0.008 ± 0.005)%。
We report the results of a search for D0-D0 mixing in D0 --> K+ pi- decays based on 400 fb(-1) of data accumulated by the Belle detector at KEKB. Both assuming CP conservation and allowing for CP violation, we fit the decay-time distribution for the mixing parameters x and y, as well as for the parameter R(D), the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays. The 95% confidence level region in the (x'2,y') plane is obtained using a frequentist method. Assuming CP conservation, we find x'2 < 0.72 x 10(-3) and -9.9 x 10(-3) < y' < 6.8 x 10(-3) at the 95% confidence level; these are the most stringent constraints on the mixing parameters to date. The no-mixing point (0,0) has a confidence level of 3.9%. Assuming no mixing, we measure R(D) = (0.377 +/- 0.008 +/- 0.005)%.