中文

测量$B^{\pm}\to D^0_{CP} K^{*\pm}$衰变的CP观测量

高能物理 - 实验 2010-03-19 v2

摘要

利用1999-2004年间在PEP-II B工厂用BABAR探测器收集的2.32亿个Υ(4S)BBˉ\Upsilon(4S) \to B\bar{B}事件样本,我们研究了BD0K(892)B^- \to D^0 K^{*}(892)^-衰变,其中KKSπK^{*-} \to K_S \pi^-D0Kπ+D^0 \to K^-\pi^+Kπ+π0K^-\pi^+\pi^0Kπ+π+πK^-\pi^+\pi^+\pi^-(非CP末态);K+KK^+K^-π+π\pi^+\pi^-(CP+本征态);KSπ0K_S\pi^0KSϕK_S\phiKSωK_S\omega(CP-本征态)。我们测量了对CKM幺正三角形角度γ敏感的四个观测量:部分速率电荷不对称性ACP±A_{CP}^{\pm}和B衰变在CP±与非CP衰变中的分支比之比RCP±R_{CP}^{\pm}ACP+=0.08±0.19A_{CP}^+ = -0.08 \pm 0.19(统计)±0.08\pm 0.08(系统),ACP=0.26±0.40A_{CP}^- = -0.26 \pm 0.40(统计)±0.12\pm 0.12(系统),RCP+=1.96±0.40R_{CP}^+ = 1.96 \pm 0.40(统计)±0.11\pm 0.11(系统),RCP=0.65±0.26R_{CP}^- = 0.65 \pm 0.26(统计)±0.08\pm 0.08(系统)。

关键词

引用

@article{arxiv.hep-ex/0507002,
  title  = {Measurement of CP Observables for the Decays B+/- --> D0_CP K*+/-},
  author = {B. Aubert and BABAR Collaboration},
  journal= {arXiv preprint arXiv:hep-ex/0507002},
  year   = {2010}
}

备注

7 pages, 1 figure, published in Physical Review D Rapid Communications. The title is more accurate. A better definition of the R_CP observables is used. The cartesian coordinates are introduced at the beginning of the paper. 4 more theoretical references are given