D0-(D)over-bar0 mixing sensitivity estimation at Belle II in wrong-sign decays D0 → K+π-π0 via time-dependent amplitude analysis

作者：Li, Long-Ke^*; Chen, Ye-Qi; Yan, Wen-Biao; Zhang, Zi-Ping

来源：Chinese Physics C, 2017, 41(2): 023001.

DOI：10.1088/1674-1137/41/2/023001

• D-0-(D)over-bar(0) mixing
• sensitivity estimation
• time-dependent amplitude analysis
• wrong-sign decay
• Belle II

The sensitivity of the D-0-(D) over bar (0) mixing parameters x and y is estimated in the wrong-sign decay D K+pi(-)pi(0) n by time-dependent amplitude analysis. The resolution of the D-0 lifetime is essential in time-dependent Dalitz analyses. The Belle II detector, which aims to collect a total integrated luminosity of 50 ab(-1) of data, has sigma = 140 fs in Monte Carlo studies, a factor of two improvement over that of Belle and BaBar, so the produced Dalitz signal Monte Carlo samples are smeared with this resolution. Then a time-dependent Dalitz plot fitting is performed on these smeared samples, and the sensitivity of D-0-(D) over bar (0) mixing parameters are sigma(x) = 0.057% and sigma(y) = 0.049%. These are about an order of magnitude improvement on current experimental results, without considering background effects.

• 出版日期2017-2
• 单位中国科学技术大学