论文标题
在轻正式中的抗三重抗毛的半弱衰变
Semileptonic weak decays of anti-triplet charmed baryons in the light-front formalism
论文作者
论文摘要
我们系统地研究了$ {\ bf b_c} \ to {\ bf b_n} \ ell^+ el^+ en^+ en^+ en^+ en^+ en {\ ell} $的半衰减衰减，在轻蛋白Quark模型中$（ξ_c^0，ξ_c^+，λ_c^+）$和$ {\ bf b_n} $对应于八位钟。我们确定了带有费米统计的重子中成分的自旋培养结构，并计算衰减分支比（$ {\ cal b} $ S），并使用螺旋形式形式上的平均不对称参数（$α$ s）。特别是，我们发现 $ {\ cal b}（λ_c^+ \toλe^+ v+ν_{e}，ne^+ν_{e}）=（3.55 \ pm1.04，0.36 \ pm0.15）\％$ $， $ {\ cal b}（ξ_c^+ \ toξ^0 e^+ν_{ 和$ {\ cal b}（ξ_c^0 \ toξ^ - e^+ν_{e}，σ^ - e^+ν_{e}）=（3.49 \ pm0.95,0.22 \ pm0.06）\％$。 我们的结果与当前的实验数据一致。我们对$ {\ cal b}（λ_c^+ \ to n e^+ν_{e}）$的预测与文献中的$一致，文献可以通过魅力效果（例如besiii and Belle和belle）来衡量。我们的一些结果可以通过Belle的实验以及LHCB和Belleii的实验测试，可以测试$ξ_c^{+（0）} $半雌科通道。
We systematically study the semileptonic decays of ${\bf B_c} \to {\bf B_n}\ell^+ ν_{\ell}$ in the light-front constituent quark model, where ${\bf B_c}$ represent the anti-triplet charmed baryons of $(Ξ_c^0,Ξ_c^+,Λ_c^+)$ and ${\bf B_n}$ correspond to the octet ones. We determine the spin-flavor structures of the constituents in the baryons with the Fermi statistics and calculate the decay branching ratios (${\cal B}$s) and averaged asymmetry parameters ($α$s) with the helicity formalism. In particular, we find that ${\cal B}( Λ_c^+ \to Λe^+ ν_{e}, ne^+ ν_{e})=(3.55\pm1.04, 0.36\pm0.15)\%$, ${\cal B}( Ξ_c^+ \to Ξ^0 e^+ ν_{e},Σ^0 e^+ ν_{e},Λe^+ ν_{e})=(11.3\pm3.35), 0.33\pm0.09,0.12\pm0.04\%$ and ${\cal B}( Ξ_c^0 \to Ξ^- e^+ ν_{e},Σ^- e^+ ν_{e})=(3.49\pm0.95,0.22\pm0.06)\%$. Our results agree with the current experimental data. Our prediction for ${\cal B}( Λ_c^+ \to n e^+ ν_{e})$ is consistent with those in the literature, which can be measured by the charm-facilities, such as BESIII and BELLE. Some of our results for the $Ξ_c^{+(0)}$ semileptonic channels can be tested by the experiments at BELLE as well as the ongoing ones at LHCb and BELLEII.
