We investigate roads for evaluating model-independent cross-section distributions for the sequential hyperon decay $Σ^0\rightarrowΛγ;Λ\rightarrow pπ^- $ and its corresponding antihyperon decay. The hyperons are produced in the reaction $e^+e^-\rightarrow J/ψ\rightarrow Σ^0\barΣ^0$. Cross-section distributions are calculated using the folding technique.
We study the three-body baryonic B decay $\bar{B}^{0}_{s}\rightarrow p\barΛ K^{-}$ within the framework of the pole model via the baryonic $Λ_{b}$ pole. In our calculation, we require the strong coupling constant $g_{Λ_{b}B_{s}Λ}$ and investigate if $g_{Λ_{b}B_{s}Λ}=10.49\pm1.57$ is adopted, the branching ratio agrees with the experimental result, reported by the LHCb collaboration.
The semileptonic $Ω_c^0 \rightarrow Ω^- l ν$ and non-leptonic $Ω_c^0 \to Ω^- π^+$, $Ω_c^0 \to Ω^- ρ^+$ decays of charmed $Ω_c$ baryon are studied within the light cone sum rules. The form factors responsible for $Ω_c \to Ω$ transitions are calculated using the distribution amplitudes of $Ω_c$ baryon. With the obtained form factors, the branching ratios of $Ω_c^0 \to Ω^- l^+ ν_l$, $Ω_c^0 \rightarrow Ω^- π^+$, and $Ω_c^0 \rightarrow Ω^- ρ^+$ decays are estimated. The results are compared with Belle data as well as the findings of the other approaches.
We investigate the prospects for detecting axion-like particles (ALPs, dubbed as "a") via the decay $Z\rightarrow a f\bar{f}$ at future $Z$ factories. Considering the decay channels $a\rightarrow μ^+ μ^-$ and $a\rightarrow b \bar{b}$ , four types of signals $μ^+ μ^- /E$, $b b /E$, $e^+ e^- μ^+ μ^-$ and $e^+ e^- b b$ are explored. We demonstrate that these channels are promising for detecting ALPs at $Z$ factories and obtain the sensitivity bounds on the couplings $g_{aZZ}$ and $g_{aγZ}$.
Using the Bethe-Salpeter equation (BSE) we investigate the forward-backward asymmetries $( A_{FB}) $ in $Λ_b \rightarrow Λl^+ l^-(l=e,μ,τ)$ in the quark-diquark model. This approach provides precise form factors that are different from those of QCD sum rules. We calculate the rare decay form factors for $Λ_b \rightarrow Λl^+ l^-$ and investigate the (integrated) forward-backward asymmetries in these decay channels. We find that the integrated $A^l_{FB}$, $\bar{A}^l_{FB}(Λ_b \rightarrow Λe^+ e^-) \simeq -0.1371 $, $\bar{A}^l_{FB}(Λ_b \rightarrow Λμ^+ μ^- ) \simeq -0.1376 $, $\bar{A}^l_{FB}(Λ_b …
Constraint on compactification scale via recently observed baryonic $Λ_b\rightarrow Λ\ell^+ \ell^-$ channel and analysis of the $Σ_b \rightarrow Σ\ell^+ \ell^-$ transition in SM and UED scenario
New Analysis of $B \rightarrow Kπ$ data with Pauli blocking CP violation in $B^o$ decays, not in $B^{\pm}$ SU(3) use of $B \rightarrow ππ$ data invalid for $B \rightarrow Kπ$
The Quark Flavor Violating Higgs Decay $h \rightarrow \bar b s + b \bar s$ in the MSSM
研究了最小超对称标准模型中夸克味破坏的Higgs玻色子衰变$h \rightarrow \bar b s + b \bar s$.首先在独立模型中分析衰减，然后在第二步中在最小味道违反（MFV）约束MSSM中分析衰减。从$B$ -物理观测量（BPO）和电弱精密观测量（EWPO）的实验约束也计算和施加在参数空间。结果表明，在某些情况下，EWPO比BPO更强地限制了味道违反参数空间。在模型中，可找到${\rm BR}(h \rightarrow \bar b s + b \bar s)$的${\cal O}(10^{-4})$独立分析值。在MFV CMSSM中，这样的结果只能在参数空间的非常有限的部分中获得。结果表明，不排除在未来的$e^+e^-$对撞机上观察到MSSM中的$h \rightarrow \bar b s + b \bar s$衰变。
Study of $Λ_b\rightarrow~ Λl^+l^-$ and $Λ_b\rightarrow p l \barν$ decays in the Bethe-Salpeter equation approach
在我们以前的工作中，基于$SU(6)$自旋味波函数，我们把$Λ$和$p$看作是由不同的夸克-双夸克组态组成，建立了夸克和标量双夸克组态的Bethe-Salpeter（BS）方程。在我们目前的工作中，我们应用该模型来计算标准模型（SM）中半轻子跃迁$Λ_b\rightarrowΛl^+l^-$ $(l=μ,e,τ)$和$Λ_b\rightarrow p l\barν$的形状因子。衰变$Λ_b\rightarrowΛμ^+μ^-$是特别有趣的，因为它已经在CDF和LHCb合作中测量，这种罕见的衰变对新的物理效应非常敏感。$Λ_b\rightarrow p l\barν$衰变是在大型强子对撞机上测量Cabibbo-Kobayashi-Maskawa矩阵元$|V_{ub}|$的一种很有前途的模式。在我们的计算中，根据BS方程核中双夸克质量和夸克与双夸克相互作用强度等模型参数的取值范围，我们发现，在我们的模型中，$Λ_b\rightarrowΛμ^+μ^-$的分支比与实验数据是一致的，目前LHCb的实验结果与我们计算的$Λ_b\rightarrowΛμ^+μ^-$的微分分支比一致，只是在较大的范围内动量传递区这表明仍有可能产生新的物理效应的空间。我们也给出了$Λ_b\rightarrowΛl^+l^-$和$Λ_b\rightarrow p l\barν$的总分支比与其它唯象方法的结果的比较。
Investigation of the $B_c\rightarrow χ_{c2} l \barν $ transition via QCD sum rules
在QCD求和规则的框架下，考虑双胶子凝聚修正，计算了半轻子$B_c\rightarrow χ_{c2} l \barν $的跃迁形状因子。利用所得到的形状因子的结果，我们估计了在所有轻子通道中与这种跃迁有关的衰变宽度和分支比。所得结果与其他非微扰方法的预测进行了比较。不同轻子通道的分支比的顺序表明，$B_c\rightarrow χ_{c2} l \barν $跃迁可以在大型强子对撞机上利用收集到的或将来的数据进行研究。
We investigate $J/ψ$ decays into octet baryon-antibaryons pairs. The decay amplitudes are computed within the collinear QCD factorisation framework. The subleading amplitude, which describes the decay of longitudinally polarised charmonium, is computed using twist-4 three-quark distribution amplitudes. The obtained results are used for a qualitative analysis of the experimental data. It is found that the polarisation parameter $α_B$ can be described with an accuracy $10-30\%$, which may indicate that the pQCD contribution dominates this observable.
An investigation about localized CP asymmetries for the processes of $\bar{B}_{s}^{0} \rightarrow π^{+}π^{-}π^{0} (K^{0})$ is presented in this paper. The innovation of this paper is that there is a consideration of three-particle $ρ^0(770)$, $ω(782)$ and $ϕ(1020)$ interferences effect. Generally, $ω(782)$ and $ϕ(1020)$ both can decay into $π^+π^-$ pair where can cause extremely small contribution from isospin symmetry breaking. Nevertheless, our analysis shows that $\bar{B}_{s}^{0} \rightarrow π^+π^-π^{0}(K^{0})$ decay process can bring differential CP asymmetry about $65\%$ ($36\%$) because …
The observation of anomalies in the charged current $b\rightarrow c\bar{\ell}ν_{\ell}$ transitions hints the possibility of the existence of new physics beyond the standard model. Inspired by the work done in the beauty quark sector, we explore new physics in the charm quark sector with $c \rightarrow (s,d)\bar{\ell}ν_{\ell}$ charged current transitions. We analyze the decay modes $D_{(s)}^+ \to η^{(')} \bar{\ell} ν_{\ell}$ within an effective Lagrangian framework which includes both standard model and new physics contributions. We use the available experimental measurements of the semileptoni…
