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arXiv 2102.01552hep-phhep-ex
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光阵面夸克模型中$Λ_b^0$的非轻子两体衰变

Non-leptonic two-body decays of $Λ_b^0$ in light-front quark model

C. Q. Geng, Chia-Wei Liu, Tien-Hsueh Tsai

备注：
16 pages, 1 figure, accepted for publication in PLB. arXiv admin note: text overlap with arXiv:2002.10612
发表信息：
Phys. Lett. B815, 136125 (2021)
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摘要：

在广义因子分解近似下，在光阵面夸克模型中研究了$Λ_b^0 \to p M$与$ M=(π^-,K^-)$和$(ρ^-,K^{*-})$的非轻子两体弱衰变。通过考虑夸克间的费米统计和确定重子的自旋味结构，计算了衰变的分支比（${\cal B}$ s）和CP破坏速率不对称性（$\mathcal{A}_{CP}$ s）.解释性地，我们发现${\cal B}( Λ_b^0 \to p π^- ,pK^-)=(4.18\pm0.15\pm0.30, 5.76\pm0.88\pm0.23)\times10^{-6}$和${\mathcal{A}_{CP}}( Λ_b^0 \to p π^- ,\,pK^-)=(-3.60\pm0.14\pm0.14, 6.36\pm0.21\pm0.18)\%$分别与粒子数据组给出的${\cal B}( Λ_b^0 \to p π^- ,pK^-)=(4.5\pm0.8, 5.4\pm1.0)\times10^{-6}$和${\mathcal{A}_{CP}}( Λ_b^0 \to p π^- ,pK^-)=(-2.5\pm 2.9, -2.5\pm2.2)\%$的数据进行比较。我们还预测了${\cal B}( Λ_b^0 \to p ρ^-,pK^{*-} )=(12.13\pm3.27\pm0.91, 2.58\pm0.87\pm0.13)\times 10^{-6}$和${\mathcal{A}_{CP}}( Λ_b^0 \to p ρ^-,pK^{*-} )=(-3.32\pm0.00\pm0.14,19.25\pm0.00\pm0.80)\%$，这可以通过在LHCb的实验观察到。

英文摘要：

We study the non-leptonic two-body weak decays of $Λ_b^0 \to p M$ with $ M=(π^-,K^-)$ and $(ρ^-,K^{*-})$ in the light-front quark model under the generalized factorization ansatz. By considering the Fermi statistic between quarks and determining spin-flavor structures in baryons, we calculate the branching ratios (${\cal B}$s) and CP-violating rate asymmetries ($\mathcal{A}_{CP}$s) in the decays. Explicitly, we find that ${\cal B}( Λ_b^0 \to p π^- ,pK^-)=(4.18\pm0.15\pm0.30, 5.76\pm0.88\pm0.23)\times10^{-6}$ and ${\mathcal{A}_{CP}}( Λ_b^0 \to p π^- ,\,pK^-)=(-3.60\pm0.14\pm0.14, 6.36\pm0.21\pm0.18)\%$ in comparison with the data of ${\cal B}( Λ_b^0 \to p π^- ,pK^-)=(4.5\pm0.8, 5.4\pm1.0)\times10^{-6}$ and ${\mathcal{A}_{CP}}( Λ_b^0 \to p π^- ,pK^-)=(-2.5\pm 2.9, -2.5\pm2.2)\%$ given by the Particle Data Group, respectively. We also predict that ${\cal B}( Λ_b^0 \to p ρ^-,pK^{*-} )=(12.13\pm3.27\pm0.91, 2.58\pm0.87\pm0.13)\times 10^{-6}$ and ${\mathcal{A}_{CP}}( Λ_b^0 \to p ρ^-,pK^{*-} )=(-3.32\pm0.00\pm0.14,19.25\pm0.00\pm0.80)\%$, which could be observed by the experiments at LHCb.

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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