A model-independent Dalitz plot analysis of B ± ? D K ± with D ? K S 0 h + h - ( h = p , K ) decays and constraints on the CKM angle ?
A model-independent Dalitz plot analysis of B ± ? D K ± with D ? K S 0 h + h - ( h = p , K ) decays and constraints on the CKM angle ?
复制标题
B ± ? 的模型独立 Dalitz 图分析
DOI：
10.1016/j.physletb.2012.10.020
复制
发表时间：
2012
影响因子：
4.4
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
对B±→DK±衰变（D→ KS 0 π+π−和D→ KS 0 K +K−）进行分组Dalitz图分析，以测量对CKM角γ敏感的CP破坏观测量x±和y±。该分析利用了LHCb实验收集的1.0 fb− 1数据。该研究没有对Dalitz图上D衰变振幅的强相位的变化进行基于模型的假设，而是使用CLEO-c的测量值作为输入。参数值为x−=（0.0±4.3±1.5±0.6）×10−2，y−=（2.7±5.2±0.8±2.3）×10−2，x+=（−10.3±4.5±1.8±1.4）×10− 2和y+=（−0.9±3.7±0.8±3.0）×10−2。第一，第二，和第三不确定度的统计，实验系统，并在CLEO-C测量的强相位参数的精度相关的误差，分别。这些结果对应于γ=（44−38+43）°，在γ→γ+180°处有第二个解，并且rB=0.07±0.04，其中rB是受抑制的和有利的B衰变振幅之间的比率。
A binned Dalitz plot analysis of B±→DK±decays, with D→KS0π+π−and D→KS0K+K−, is performed to measure the CP-violating observables x±and y±which are sensitive to the CKM angle γ. The analysis exploits 1.0 fb−1of data collected by the LHCb experiment. The study makes no model-based assumption on the variation of the strong phase of the D decay amplitude over the Dalitz plot, but uses measurements of this quantity from CLEO-c as input. The values of the parameters are found to be x−=(0.0±4.3±1.5±0.6)×10−2, y−=(2.7±5.2±0.8±2.3)×10−2, x+=(−10.3±4.5±1.8±1.4)×10−2and y+=(−0.9±3.7±0.8±3.0)×10−2. The first, second, and third uncertainties are the statistical, the experimental systematic, and the error associated with the precision of the strong-phase parameters measured at CLEO-c, respectively. These results correspond to γ=(44−38+43)°, with a second solution at γ→γ+180°, and rB=0.07±0.04, where rBis the ratio between the suppressed and favoured B decay amplitudes.