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首页> 外文期刊>European physical journal >A comprehensive analysis of weak transition form factors for doubly heavy baryons in the light front approach
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A comprehensive analysis of weak transition form factors for doubly heavy baryons in the light front approach

机译：浅析浅层转型形式因子在轻前线方法中双重重型的影响因素

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The transition form factors for doubly heavy baryons into a spin-1/2 or spin-3/2 ground-state baryon induced by both the charged current and the flavor changing neutral current are systematically studied within the light-front quark model. In the transition the two spectator quarks have two spin configurations and both are considered in this calculation. We use an updated vertex functions, and inspired by the flavor SU(3) symmetry, we also provide a new approach to derive the flavor-spin factors. With the obtained transition form factors, we perform a phenomenological study of the corresponding semi-leptonic decays of doubly heavy baryons induced by the $$cightarrow d/s ell ^+u $$ c→d/s?+ν, $$bightarrow c/uell ^-ar{u }$$ b→c/u?-νˉ and $$bightarrow d/sell ^+ell ^-$$ b→d/s?+?-. Results for partial decay widths, branching ratios and the polarization ratios $$Gamma _{L}/Gamma _{T}$$ ΓL/ΓTs are given. We find that most branching ratios for the semi-leptonic decays induced by the $$cightarrow d,s$$ c→d,s transitions are at the order of $$10^{-3}sim 10^{-2}$$ 10-3～10-2, which might be useful for the search of other doubly-heavy baryons. Uncertainties in form factors, the flavor SU(3) symmetry and sources of symmetry breaking effects are discussed. We find that the SU(3) symmetry breaking effects could be sizable in charmed baryon decays while in the bottomed case, the SU(3) symmetry breaking effects are less significant. Our results can be examined at the experimental facilities in the future.
机译：在光前夸克模型中，系统地研究了双重重码销的转换形式因子，用于通过带电电流和风味改变中性电流诱导的旋转-1 / 2或旋转-3 / 2个地区胸静脉。在过渡中，两个观众夸克有两个自旋配置，并且在该计算中考虑了两者。我们使用更新的顶点函数，并受到风味SU（3）对称性的启发，我们还提供了一种新的方法来导出风味 - 旋转因子。随着所获得的过渡表格因素，我们对由$$ C Lightarrow D / S ^ ^ + ref→d / s？+ν ，$$ b strigharrow c / u el ^ - bar { nu} $$ b→c / u？和$$ b lightarrow d / s el ^ + el ^ - $$ b→ d / s？+？ - 。偏衰减宽度，分支比和偏振比率的结果提供了$$ Gamma _} / gamma _ {t} $$γ1/γts。我们发现，由$$ C Lightarrow D，S $$ C→D，S转换所引起的半轻素衰减的大多数分支比率为$$ 10 ^ { - 3} sim 10 ^ { - 2 $$ 10-3〜10-2，这可能有助于搜索其他双重重型的Baryons。讨论了形式因素的不确定性，讨论了风味SU（3）对称性和对称性破坏效果的来源。我们发现SU（3）对称性破碎效果可以在CharMed Baryon衰变中均匀，而在底部壳体中，SU（3）对称性断裂效应不太显着。我们的结果可以在未来的实验设施中进行检查。

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