arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1010.3181hep-phhep-ex
收藏

一族非普适Z'玻色子在\bar{B}_s ->πK，πK*，ρK衰变和B_d- \bar{B_d}混合中的作用

The Effects of a Family Non-universal Z' Boson in the \bar{B}_s->πK, πK*, ρK Decays and B_d-\bar{B_d} mixing

Qin Chang, Ya-dong Yang

备注：
20 pages, 4 figures; final version to appear in Nucl. Phys. B
发表信息：
Nucl.Phys.B852:539-552,2011
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们重新审视$\bar{B}_s\to πK$，$πK^{\ast}$和$ρK$衰变QCDF形式主义，并检查一个家庭的非通用$Z^\prime$玻色子在这些衰变的可能影响。在我们的评估中，还包括了$B_d-\bar{B_d}$混合对左手变味$d-b-Z^{\prime}$偶联$B_{db}^{L}$ ~（$\sim0.2\times10^{-3}$）强度的强约束。在数值上，我们发现一个新的弱相$ϕ^L_d\sim-50^{\circ}$参与$B_{db}^{L}$，$u-u-Z^{\prime}$和$d-d-Z^{\prime}$耦合的负组合$P_{ud}^{R}$和/或$D_{ud}^{L}$具有更大的绝对值是至关重要的，以提高SM预测和实验测量之间的${\cal B}(\bar{B}_s\to π^- K^+)$的一致性。一般而言，$Z^{\prime}$的作用最多可使${\cal B}(\bar{B}_s\to π^- K^+)$减少约18%。此外，结合最近更新的测量$β_s$的CDF和D 0合作，我们还发现，$Z^{\prime}$的影响，在$\bar{B}_s\to π^- K^+$衰变是非常重要的检查是否CKM样的层次结构坚持在一个家庭的非通用$Z^{\prime}$耦合矩阵。

英文摘要：

We revisit $\bar{B}_s\to πK$, $πK^{\ast}$ and $ρK$ decays within QCDF formalism and examine the possible effects of a family non-universal $Z^\prime$ boson in these decays. In our evaluations, the strong constraints from $B_d-\bar{B_d}$ mixing on the strength of the left-handed flavor-changing $d-b-Z^{\prime}$ coupling $B_{db}^{L}$ ~($\sim0.2\times10^{-3}$) is also included. Numerically, we find that a new weak phase $ϕ^L_d\sim-50^{\circ}$ involved in $B_{db}^{L}$, the negative combination of the $u-u-Z^{\prime}$ and $d-d-Z^{\prime}$ couplings $P_{ud}^{R}$ and/or $D_{ud}^{L}$ with larger absolute value are crucial to improve the agreement of ${\cal B}(\bar{B}_s\to π^- K^+)$ between the SM prediction and the experimental measurement. Generally, ${\cal B}(\bar{B}_s\to π^- K^+)$ could be reduced by about 18% at most by $Z^{\prime}$ contributions. Moreover, combining with the recent updated measurement on $β_s$ by CDF and D0 collaborations, we also find that $Z^{\prime}$ effects in $\bar{B}_s\to π^- K^+$ decays are very important for examining whether the CKM-like hierarchy persists in a family non-universal $Z^{\prime}$ coupling matrix.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑