在全微分水平上计算了b \to c l \bar v_l衰变率的次-次-首阶（NNLO）QCD修正.可以对衰变产物的运动学变量进行任意切割。我们的计算可用于研究NNLO QCD对总衰变率以及轻子能量、强子不变质量和强子能量矩的修正，并将这些修正纳入包含性半轻子B衰变的整体拟合中.
英文摘要：
We compute the next-to-next-to-leading order (NNLO) QCD corrections to b \to c l \bar ν_l decay rate at a fully differential level. Arbitrary cuts on kinematic variables of the decay products can be imposed. Our computation can be used to study the NNLO QCD corrections to the total decay rate as well as to the lepton energy, hadronic invariant mass and hadronic energy moments and to incorporate those corrections into global fits of inclusive semileptonic B-decays.
This paper studies the leading chiral corrections to heavy quark-diquark symmetry predictions for doubly heavy baryon semileptonic decay form factors. We derive the coupling between heavy diquarks and weak current in the limit of heavy quark-diquark symmetry, and construct the chiral Lagrangian for doubly heavy baryons coupled to weak current. We evaluate chiral corrections to doubly heavy baryon zero-recoil semileptonic decay for both unquenched and partially quenched QCD. This theory is used to derive chiral extrapolation expressions for measurements of form factors of doubly heavy baryon ze…
We extend previous computations of the second order QCD corrections to semileptonic b \to c inclusive transitions, to the case where the charged lepton in the final state is massive. This allows accurate description of b \to c τ\bar ν_τdecays. We review techniques used in the computation of O(α_s^2) corrections to inclusive semileptonic b \to c transitions and present extensive numerical studies of O(α_s^2) QCD corrections to b \to c l \bar ν_l decays, for l =e, τ.
Radiative corrections to the three-body region of the Dalitz plot of baryon semileptonic decays with angular correlation between polarized emitted baryons and charged leptons: The initial-baryon rest frame case
We review recent progress in the perturbative calculations for semileptonic and hadronic B meson decays with an emphasis on the phenomenological implications of the next-to-next-to-leading order (NNLO) corrections. Specifically, we consider CP-averaged branching ratios of tree-dominated B -> pi pi/pi rho/rho rho decays and the inclusive determination of |V_ub| from B -> X_u l nu.
We present our recent calculation of the third order corrections to the semileptonic $b \to c$ and the muon decays. The calculation has been performed in an expansion around the limit $m_c \sim m_b$, but shows decent convergence even for $m_c=0$ from which the contribution to the muon decay can be extracted. For the semileptonic $b \to c$ decay we find large perturbative corrections in the on-shell scheme which can be significantly reduced by changing to the kinetic scheme for the bottom quark mass. These results are important input for the inclusive determination of $|V_{cb}|$ and the Fermi c…
The semileptonic transition of $Λ_b$ baryon is studied using the Hypercentral constituent quark model. The six-dimensional hyperradial $Schr\ddot{o}dinger$ equation is solved in the variational approach to get masses and wavefunctions of heavy baryons. The matrix elements of weak decay are written in terms of the overlap integrals of the baryon wave function. The Isgur-Wise function is determined to calculate exclusive semileptonic decay $Λ_b$ $\rightarrow$ $Λ_c$ $\ell$ $\barν$. The calculated decay rate and the branching ratio of $Λ_b$ baryon are consistent with other theoretical predictions …
NNLO corrections to inclusive semileptonic B decays in the shape-function region
我们计算了形状函数区域中B -> X_u l nu衰变因子分解公式中硬系数函数的双圈QCD修正。我们的计算提供了包含半轻子B衰变的NNLO分析所需的最后一个缺失的部分，这可能会显着降低CKM矩阵元素|V_ub|提取的理论不确定性。在技术方面，我们发现，2-回路硬系数函数是免费的红外奇异性的因式分解框架所预测的。我们执行一个简短的数值分析的NNLO修正，并包括魅力质量效应的讨论。
Precision radiative corrections to the semileptonic Dalitz plot with angular correlation between polarized decaying and emitted baryons: Effects of the four-body region
Precision radiative corrections to the semileptonic Dalitz plot with angular correlation between polarized decaying baryon and emitted charged lepton: Effects of the four-body region
Numerical precision radiative corrections to the Dalitz plot of light and heavy quark unpolarized baryon semileptonic decays. The cases Xi^0 \to Sigma^+ e \barν and Λ_c^+ \to Λe^+ ν
我们提出并讨论了我们以前的精确结果的数值使用非极化自旋二分之一重子半轻子衰变的辐射校正，这是不妥协的固定形状因子在规定的值。我们提出了各种crosscheriches和其他结果的比较，在文献中的这种分析辐射校正。然而，我们的分析是通用的，适用于重夸克允许的重子的所有电荷分配。该过程以过程^+ e \bar v和Λ_c^+ \to Λe^+ v为例。
Precise nondivergent analytic formulas for the radiative corrections to the beta energy spectrum in hyperon semileptonic decays over the entire Dalitz plot
We compute the $O(α_s)$ corrections to the Wilson coefficient of the chromomagnetic operator in inclusive semileptonic B decays. The results are employed to evaluate the complete $O(α_s Λ^2/m_b^2)$ correction to the semileptonic width and to the first moments of the lepton energy distribution.
The static properties and semileptonic decays of ground-state doubly heavy baryons are studied working in the framework of a non-relativistic quark model. Using a phenomenological potential model, we calculate the ground-state masses and magnetic moments of doubly heavy $ Ω$ and $ Ξ$ baryons. In the heavy quark limit, we introduce a simple form of the universal Isgur-Wise function used as the transition form factor and then investigate the exclusive $ b \rightarrow c $ semileptonic decay widths and branching ratios for $ \frac{1}{2}\rightarrow \frac{1}{2} $ baryon transitions. Our obtained res…
Radiative corrections to the semileptonic Dalitz plot with angular correlation between polarized decaying and emitted hyperons: effects of the four-body region
We present a detailed analysis of the heavy-to-light semileptonic decays of the Lambda_b and Lambda_c baryons Lambda_b -> p l- bar(nu)_l and Lambda_c -> n l+ nu_l in the covariant confined quark model. We calculate the invariant and helicity amplitudes of the two processes which are then used to analyze their angular decay distributions, their rates and asymmetry parameters.
Constraints on Higher-Order Perturbative Corrections in $b\to u$ Semileptonic Decays from Residual Renormalization-Scale Dependence
约束的逐步减少的剩余重整化尺度的依赖性增加循环顺序的方法获得的边界未知的高阶微扰校正重整化群不变量。这种技术适用于包容性的半轻子过程$b\to u \barν_\ell\ell^-$（明确已知的两个循环的顺序），以获得上的三个和四个循环的微扰系数，是无法通过重整化群访问的界限。利用最小灵敏度原理，得到了微扰对$Γ(b\to u \barν_\ell\ell^-)$的贡献的估计，该估计包含了来自尚未确定的高阶QCD修正的理论不确定性.
