论文标题
未经修改的MIT包型$λ_b$ $λ_b$
Nonleptonic two-body weak decays of $Λ_b$ in modified MIT bag model
论文作者
论文摘要
我们通过在不引入新参数来构建Baryons的动量特征状态的情况下修改MIT袋模型来研究$λ_b$的非质子两体弱衰变。我们发现$λ_b^0 \至λ_c^+π^ - $，$λ_c^+ k^ - $，$ pk^ - $和$ pk^ - $是$（4.5 \ pm0.2）\ times 10^{ - 3} $（3.4 \ pm 0.1 \ pm 0.1）$（4.5），$ 0.1） 10^{ - 6} $和$（6.0 \ pm 0.7）\ times 10^{ - 6} $，它们分别与当前的实验数据一致。我们还探索了$λ_b^0 \ to p（π^ - ，k^ - ）$的衰减的P和CP不对称。特别是，我们获得$λ_b^0 \ topπ^ - $和$λ_b^0 \ to p k^ - $的直接CP侵入率不对称率约为$ -4.4 \％$ $和$ 6.7 \％\％\％$，与$（-2.5 \ pm2.9）\％$（-2.5 \ pm2.9）\％$（-2.5 \ pm2.5）相比 分别。
We study the nonleptonic two-body weak decays of $Λ_b$ by modifying the MIT bag model without introducing new parameters to construct the momentum eigenstates of the baryons. We find that the branching ratios of $Λ_b^0 \to Λ_c^+ π^-$, $Λ_c^+ K^-$, $p π^-$ and $pK^-$ are $(4.5\pm0.2)\times 10^{-3}$, $(3.4\pm 0.1)\times 10^{-4}$, $(5.0\pm 0.5)\times 10^{-6}$ and $(6.0\pm 0.7) \times 10^{-6}$, which are all well consistent with the current experimental data, respectively. We also explore P and CP asymmetries for the decays of $Λ_b^0 \to p (π^-,K^-)$. In particular, we obtain that the direct CP-violating rate asymmetries in $Λ_b^0 \to p π^-$ and $Λ_b^0 \to p K^-$ are around $-4.4\%$ and $6.7\%$, in comparison with $(-2.5\pm2.9)\%$ and $(-2.5\pm2.2)\%$ from the Particle Data Group in 2020, respectively.
