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arXiv 2403.04878hep-phhep-ex
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$B\rightarrow DP$ 中 SU(3) 味对称性破缺的再评估

Reappraisal of SU(3)-flavor breaking in $B\rightarrow DP$

Jonathan Davies, Stefan Schacht, Nicola Skidmore, Amarjit Soni

AI总结:

针对 $B_{(s)}\rightarrow D_{(s)}P$ 衰变实验与 QCD 因子化预测的偏差,研究者无额外理论输入拟合分支比数据,验证 SU(3)$_F$ 展开幂次计数,明确破缺贡献水平并预测可由 LHCb 探测的未测量衰变分支比。

摘要:

鉴于近期发现 $B_{(s)}\rightarrow D_{(s)}P$ 衰变(其中 $P=\{π,K\}$)的实验数据与 QCD 因子化预测存在偏差,我们在不引入额外理论输入的情况下,通过拟合实验分支比数据系统探究了 SU(3)$_F$ 展开的当前研究现状。我们发现当前数据与 SU(3)$_F$ 展开的幂次计数相符。尽管 SU(3)$_F$ 极限在 $>5σ$ 的置信水平下被排除,但幅度层面约 20% 的 SU(3)$_F$ 破缺贡献就足以极好地描述数据。树图($>5σ$)和色压低树图($2.4σ$)中均需要 SU(3)$_F$ 破缺。我们目前尚无法探测到交换图中的 SU(3)$_F$ 破缺。基于底层的 SU(3)$_F$ 参数化,我们预测了可在 LHCb 实验中搜寻的压低衰变的未测量分支比:$\mathcal{B}(\overline{B}_s^0\rightarrow π^- D^+) = 2 \mathcal{B}(\overline{B}_s^0\rightarrow π^0 D^0) = [0.3, 7.2] \times 10^{-6}$。

英文摘要:

In light of recently found deviations of the experimental data from predictions from QCD factorization for $B_{(s)}\rightarrow D_{(s)}P$ decays, where $P=\{π,K\}$, we systematically probe the current status of the SU(3)$_F$ expansion from a fit to experimental branching ratio data without any further theory input. We find that the current data are in agreement with the power counting of the SU(3)$_F$ expansion. While the SU(3)$_F$ limit is excluded at $>5σ$, amplitude-level SU(3)$_F$-breaking contributions of $\sim 20\%$ suffice for an excellent description of the data. SU(3)$_F$ breaking is needed in tree ($>5σ$) and color-suppressed tree ($2.4σ$) diagrams. We are not yet sensitive to SU(3)$_F$ breaking in exchange diagrams. From the underlying SU(3)$_F$ parametrization we predict the unmeasured branching ratios $\mathcal{B}(\overline{B}_s^0\rightarrow π^- D^+) = 2 \mathcal{B}(\overline{B}_s^0\rightarrow π^0 D^0) = [0.3, 7.2] \times 10^{-6}$ of suppressed decays that can be searched for at the LHCb experiment.

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。

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