Zhang L M, Zhang Z P, Li J, Abe K, Abe K, Adachi I, Aihara H, Anipko D, Arinstein K, Asano Y, Aushev T, Bahinipati S, Bakich A M, Balagura V, Barbero M, Bay A, Bedny I, Belous K, Bitenc U, Bizjak I, Blyth S, Bondar A, Bozek A, Bracko M, Brodzicka J, Browder T E, Chang M-C, Chang P, Chao Y, Chen A, Chen W T, Cheon B G, Chistov R, Choi S-K, Choi Y, Choi Y K, Chuvikov A, Cole S, Dalseno J, Danilov M, Dash M, Drutskoy A, Eidelman S, Gabyshev N, Gershon T, Go A, Gokhroo G, Golob B, Gorisek A, Ha H C, Haba J, Hara T, Hastings N C, Hayasaka K, Hayashii H, Hazumi M, Hoshi Y, Hou S, Hou W-S, Hsiung Y B, Iijima T, Ikado K, Inami K, Ishikawa A, Ishino H, Itoh R, Iwasaki M, Iwasaki Y, Kang J H, Kapusta P, Katayama N, Kawai H, Kawasaki T, Kichimi H, Kim H J, Kim S K, Kim S M, Kinoshita K, Korpar S, Krizan P, Krokovny P, Kulasiri R, Kumar R, Kuo C C, Kuzmin A, Kwon Y-J, Leder G, Lee J, Lesiak T, Lin S-W, Liventsev D, Mandl F, Matsumoto T, Mikami Y, Mitaroff W, Miyabayashi K, Miyake H, Miyata H, Miyazaki Y, Mizuk R, Mohapatra D, Mori T, Nakao M, Natkaniec Z, Nishida S, Nitoh O, Nozaki T, Ogawa S, Ohshima T, Okabe T, Okuno S, Olsen S L, Ostrowicz W, Ozaki H, Park C W, Park H, Pestotnik R, Piilonen L E, Sakai Y, Sato N, Satoyama N, Schietinger T, Schneider O, Schwanda C, Schwartz A J, Seidl R, Senyo K, Sevior M E, Shapkin M, Shibuya H, Shwartz B, Singh J B, Sokolov A, Somov A, Soni N, Stamen R, Stanic S, Staric M, Sumisawa K, Sumiyoshi T, Suzuki S, Takasaki F, Tamai K, Tamura N, Tanaka M, Taylor G N, Teramoto Y, Tian X C, Trabelsi K, Tsuboyama T, Tsukamoto T, Uehara S, Uglov T, Ueno K, Unno Y, Uno S, Urquijo P, Usov Y, Varner G, Villa S, Wang C C, Wang C H, Watanabe Y, Won E, Xie Q L, Yabsley B D, Yamaguchi A, Yamauchi M, Ying J, Yuan Y, Zhang C C, Zhang J, Zhilich V, Zürcher D
University of Science and Technology of China, Hefei.
Phys Rev Lett. 2006 Apr 21;96(15):151801. doi: 10.1103/PhysRevLett.96.151801. Epub 2006 Apr 17.
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)%.
我们报告了基于KEKB上Belle探测器积累的400 fb⁻¹数据，在D⁰→K⁺π⁻衰变中寻找D⁰-D⁰混合的结果。既假设CP守恒又考虑CP破坏的情况下，我们对混合参数x和y以及参数R(D)（双Cabibbo压低衰变与Cabibbo允许衰变的比率）的衰变时间分布进行拟合。在(x'²,y')平面上的95%置信水平区域使用频率主义方法获得。假设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%。假设无混合，我们测量R(D)=(0.377±0.008±0.005)%。
