Xu Z
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.
Phys Rev Lett. 2000 May 29;84(22):5038-42. doi: 10.1103/PhysRevLett.84.5038.
We have studied the "wrong-sign" process D0-->K+pi(-) to search for D0-&Dmacr;( 0) mixing. The data come from 9.0 fb(-1) of e(+)e(-) collisions at sqrt[s] approximately 10 GeV recorded with the CLEO II. V detector. We measure the relative rate of the wrong-sign process D0-->K+pi(-) to the Cabibbo-favored process &Dmacr;( 0)-->K+pi(-) to be R = (0.332(+0.063)(-0.065)+/-0.040)%. We study D0-->K+pi(-) as a function of decay time to distinguish direct doubly Cabibbo-suppressed decay from D0-&Dmacr;( 0) mixing. The amplitudes that describe D0-&Dmacr;( 0) mixing, x(') and y('), are consistent with zero. At the 95% C.L. and without assumptions concerning charge-parity ( CP) violating parameters, we find (1/2)x('2)<0.041% and -5.8%<y(')<1.0%.
我们研究了“错误符号”过程D0→K +π-，以寻找D0 - D0混合。数据来自使用CLEO II.V探测器在质心能量约为10 GeV下记录的9.0 fb-1的正负电子对撞数据。我们测量了错误符号过程D0→K +π-与卡比博允许过程D0→K +π-的相对速率，得到R = (0.332( + 0.063)( - 0.065)±0.040)%。我们研究了D0→K +π-作为衰变时间的函数，以区分直接双重卡比博压低衰变和D0 - D0混合。描述D0 - D0混合的振幅x'和y'与零一致。在95%置信水平下，且在不假设电荷宇称（CP）破坏参数的情况下，我们发现(1/2)x'2 < 0.041%且 - 5.8% < y' < 1.0%。
