论文标题
固定$ |ΔC| = |ΔU| = 1 $ couplings与稀有魅力baryon衰变
Pinning down $|Δc|=|Δu|=1$ couplings with rare charm baryon decays
论文作者
论文摘要
我们研究了半蛋白质稀有魅力baryon衰变的完整角度分布，其中次级巴里昂经历了微弱的衰变，具有相当的极化参数，$ξ_c^+\toς^+\，（\ topπ^0）和$ω_c^0 \toξ^0 \，（\至λ^{0}π^0）\ ell^+\ ell^ - $。与三体衰减相比，这种自我分析的衰减链允许另外七个可观察的物品，例如$λ_c\ to p \ ell^+ \ ell^ - $，对$ | |ΔC| = | = |ΔU| = 1 $弱耦合，具有不同的敏感性。通过标准模型无效测试和其他Angular可观察物测试$ c \ u $过渡的标准模型的机会。我们表明，Leptonic $ a _ {\ text {fb}}}^\ ell $，HADRONIC $ A _ _ {\ text {fb}}^{\ text {h text {h}} $和联合前向backward backward backward backward backward backward Ansymmetry，美元$ c_ {10}，c^\ prime_ {9}，c^\ prime_ {10} $。 $ a _ {\ text {fb}}}^{\ text {h}} $也可以使用dineutrino $ c \ touν\ barν$模式和探测右手电流访问。
We study the full angular distribution of semileptonic rare charm baryon decays in which the secondary baryon undergoes weak decay with sizable polarization parameter, $Ξ_c^+\toΣ^+\,(\to pπ^0)\ell^+\ell^-$, $Ξ_c^0\toΛ^0\,(\to p π^-)\ell^+\ell^-$ and $Ω_c^0\toΞ^0\,(\to Λ^{0} π^0)\ell^+\ell^-$. Such self-analyzing decay chains allow for seven additional observables compared to three-body decays such as $Λ_c \to p \ell^+ \ell^-$, with different sensitivities to the $|Δc|=|Δu|=1$ weak couplings. Opportunities to test the standard model in $c \to u$ transitions with standard model null tests and other angular observables are worked out. We show that a joint model-independent analysis of the leptonic $A_{\text{FB}}^\ell$, hadronic $A_{\text{FB}}^{\text{H}}$, and combined forward-backward asymmetry $A_{\text{FB}}^{\ell\text{H}}$ together with the fraction of longitudinally produced leptons, $F_L$, is able to pin down the dipole couplings $C_{7},C^\prime_{7}$ and the semileptonic (axial-) vector ones $C_{10},C^\prime_{9},C^\prime_{10}$. $A_{\text{FB}}^{\text{H}}$ is also accessible with dineutrino $c \to u ν\bar ν$ modes and probes right-handed currents.
