AdS/QCD predictions for semileptonic and rare B decays to $ρ$ and $K^*$ vector mesons

辐射和稀有半轻子B衰变到三环的反常维数矩阵

Anomalous Dimension Matrix for Radiative and Rare Semileptonic B Decays up to Three Loops

本文计算了标准模型及其某些推广模型中与b到s的γ跃迁、b到s的胶子跃迁和b到s的l+l-跃迁有关的完全O（σ 2）反常维数矩阵。对于辐射衰变，我们证实了Misiak和Munz以及Chetyrkin、Misiak和Munz的结果。四夸克到半轻子算符的O（π介子^[2]）混合是一个新的结果，代表了稀有半轻子B介子衰变的次-次-首阶分析中最后缺失的成分之一。

Rare Semileptonic $B_{s}$ Decays to $η$ and $η'$ mesons in QCD

We analyze the rare semileptonic $B_s \to (η, η') l^+ l^-$, $(l=e, μ, τ)$ and $B_s \to (η, η') ν\barν$ transitions probing the $\bar s s$ content of the $η$ and $η'$ mesons via three--point QCD sum rules. We calculate responsible form factors for these transitions in full theory. Using the obtained form factors, we also estimate the related branching fractions and longitudinal lepton polarization asymmetries. Our results are in a good consistency with the predictions of the other existing nonperturbative approaches.

QCD中唯一的半轻子和稀有B介子衰变

Exclusive Semileptonic and Rare B-Meson Decays in QCD

利用光锥求和规则方法首次给出了B介子弱衰变为光矢量介子（ρ，ω，K*，φ）的半轻子和稀有辐射形状因子的完整结果.计算包括辐射修正、高扭修正和SU（3）破缺效应。详细研究了理论不确定度。每个形状因子的简单参数化以三个参数的形式给出。我们发现，形状因子观察几个关系启发重夸克对称性。

B和K介子稀有半轻子衰变中的超对称效应

Supersymmetric effects in rare semileptonic decays of B and K mesons

罕见的味道改变中性电流转换类型的$s \to d \ell^+\ell^-(ν\barν)$和$b \to s \ell^+\ell^-(ν\barν)$分析超对称扩展的标准模型与通用味耦合。结果表明，这些过程是特别敏感的左-右混合的夸克，并在非通用的$A$条款的存在下，他们可能会导致明确的新物理的签名排他性$K$和$B$介子衰变。

半轻子和稀有B介子衰变为轻赝标介子

Semileptonic and rare B meson decays into a light pseudoscalar meson

在QCD相对论势模型的框架下，我们计算了描述排斥衰变B => π lnu和B => Kl + l-的形状因子.本文的计算结果把以前对B介子衰变的分析推广到了轻矢量介子。我们发现结果与数据一致，当可用时，并与Callan-Treiman关系和无限重夸克质量限制所施加的理论约束。

稀有半轻子介子在R宇称破坏MSSM中的衰变

Rare semileptonic meson decays in R-parity violating MSSM

在R宇称破坏的标准模型的超对称扩展中讨论了稀有介子衰变$K^ + \to π^ - \ell ^ + \ell '^ + $和$D^ + \to K^ - \ell ^ + \ell '^ +$（$\ell, \ell'=e, μ$）.这些衰变的分支比的估计。

Rare semileptonic $B \to K(π)l_i^- l_j^+$ decay in vector leptoquark model

We investigate the consequence of vector leptoquarks on the rare semileptonic lepton flavour violating decays of $B$ meson which are more promising and effective channels to probe the new physics signal. We constrain the resulting new leptoquark parameter space by using the branching ratios of $B_{s, d} \to l^+ l^-$, $K_L \to l^+ l^-$ and $τ^- \to l^- γ$ processes. We estimate the branching ratios of rare lepton flavour violating $B \to K(π)l_i^- l_j^+$ processes using the constrained leptoquark couplings. We also compute the forward-backward asymmetries and the lepton non-universality paramet…

用QCD求和规则分析稀有半轻子$B_c \rar P(D,D_s) l^{+}l^{-}/ν\barν$衰变

Analysis of the rare semileptonic $B_c \rar P(D,D_s) l^{+}l^{-}/ν\barν$ decays within QCD sum rules

考虑胶子凝聚修正，在三点QCD求和规则框架下计算了半轻子稀有$B_c \rar D,D_s(J^{P}=0^{-}) l^{+}l^{-}$的$l=τ,μ,e$和$B_c \rar D,D_s(J^{P}=0^{-})ν\barν$跃迁的形状因子.计算了形状因子的重夸克有效理论极限。这些衰变的分支分数也进行了评估，并与相对论组分夸克模型的预测进行了比较。对这种类型跃迁的分析可以提供有关赝标$D_{s}$介子内部强相互作用及其结构的有用信息。

稀有和半轻子B衰变的唯象

The phenomenology of rare and semileptonic B decays

本文综述了B原子稀有衰变和半轻子衰变理论的最新进展，重点介绍了与模型无关的结果。参数化这些衰变的重到轻的形状因子允许在两个不同的运动学区域中进行独立于模型的描述。在高能轻介子的大能量极限下，软共线有效理论可以用来证明形状因子的因式分解公式。给出了在Lambda/m_b中所有B-> P，V形状因子的首阶因子分解公式.在零反冲点附近，重夸克有效理论给出了不同流的形状因子之间的有用关系。

Phenomenology of the exclusive rare semileptonic decay B -> K pi l^+ l^-

I review the phenomenology of exclusive Bbar -> Kbar pi l^+ l^- decays, with focus on the intermediate resonant Kbar^*(892) mode. The status of angular observables at both ends of the dilepton mass spectrum is revisited. Constraints on the b -> s Wilson coefficients C_7,C_9,C_10 based on 2011 data from the B factories, CDF and LHCb are presented.

用半轻子稀有B衰变确定CKM矩阵

Determination of the CKM matrix by semileptonic rare B-decays

本文利用半轻子稀有$B$衰变检验CKM矩阵幺正三角的可能性，其中$B \rightarrow X_q \, ł^+ \, ł^-$与$q = d, s$和$ł$是轻子.重点讨论了标准框架内和标准模型之外的合作伙伴不对称性。对于超标准模型，考虑了标准模型的一个最小扩展，其中包含一个额外的等单线态电荷（-1/3）夸克，这将导致偏离CKM么正性.结果，在标准模型中，CP不对称性仅对$B \rightarrow X_d \, ł^+ \, ł^-$可见，而在后一模型中，CP不对称性甚至对$B \rightarrow X_s \, ł^+ \, ł^-$也是相当大的。

Investigation of rare semileptonic $ B_c$ decays into $(D_(s,d)^((*)))μ^+ μ^-$ decays with non-universal $ Z'$ effect

In this paper, we analyze different decay observables of semileptonic $ B_c$ decays into $(D_(s,d)^((*)))μ^+ μ^-$ such as branching ratio, forward-backward asymmetry, polarization fraction and lepton polarization asymmetry in the non-universal Z' model. We have also studied the dependence of branching fraction to the new model parameters. Here, we have found that the values of different decay parameters increase in the Z' model, which provides a possible way out for the search of new physics as well as the unknown phenomena of charm B meson.

Isgur极限和Wise极限下的稀有$B$ -衰变和重轻半轻子跃迁

Rare $B$-Decays and Heavy to Light Semileptonic Transitions in the Isgur and Wise Limit

从$B^- --> ρ^0 l^-\barν_l$和$D^+ --> {\overl K}^{*0}({\overl K}^0) e^+ ν_e$的实验分支比可以发现，在$HQET$的重夸克极限中，$ |V_{bu}|=(8.1\pm 1.7) x 10^{-3}$较大，但与实际引用的范围$(2 - 7) x 10^{-3}$一致。在同样的框架中，人们预测了$R(B --> K^*γ)=( 2 \pm 2 ) 10^{-2}$。

味SU（3）对称重介子的稀有半轻子衰变

Rare Semileptonic Decays of Heavy Mesons with Flavor SU(3) Symmetry

本文计算了$D^+ \to D^0 e^+ ν$，$D^+_S \to D^0 e^+ ν$，$B^0_S \to B^+ e^- \barν$，$D^+_S \to D^+ e^- e^+$和$B^0_S \to B^0 e^-e^+$半轻子衰变过程的衰变率，其中只有轻夸克衰变，而重味保持不变.利用味SU（3）对称性计算了这些衰变过程的分支比。通过考虑SU（3）破缺效应，对不确定度进行了估计。我们发现在标准模型的框架下，衰变率是非常微小的。我们还估计了这些稀有衰变在未来实验中的测量灵敏度，如BES-III，super-$B$和LHC-$b$。

标准模型中罕见的b -> s排斥跃迁

Rare exclusive semileptonic b -> s transitions in the Standard Model

我们在标准模型的框架下研究了罕见的排他半轻子衰变B ->（K，K*）（l+ l-，nu bar{nu}）中的长距离效应，并分析了双轻子谱和不对称性.描述有效哈密顿量的介子跃迁振幅的形状因子在晶格约束的色散夸克模型中计算：形状因子通过初始和最终介子的波函数由色散表示给出，并且这些波函数被选择为使得B -> K* 跃迁形状因子在大q**2时与晶格结果一致。我们计算了半轻子B -> K，K* 跃迁模的分支比，并研究了观测量对长距离贡献的敏感性。发现前后向不对称性和轻子纵向极化不对称性的形状与长距离效应无关，主要由标准模型中Wilson系数的大小决定。

Analysis of the semileptonic $B\to K_1 \ell^+ \ell^-$transitions and non-leptonic $B \to K_1 γ$ decay in the AdS/QCD correspondence

We consider the axial-vector mesons $K_1(1270)$ and $K_1(1400)$ as a mixture of two $|^3P_1\rangle$ and $|^1P_1\rangle$ states with the mixing angle $θ$ that equal to $(-34\pm 13)^\circ$. We calculate the light-front distribution amplitudes (LFDAs) and decay constant formulas for both the axial-vector mesons $K_1$ in the AdS/QCD correspondence. The transition form factors of the semileptonic $B\to K_1$ decays are derived in terms of the LFDAs for $K_1$ mesons. Using these form factors and decay constant values, the differential branching ratios of $B\to K_1 (1270, 1400) \ell^+ \ell^-$,~$\ell=μ…

Study of the rare semileptonic decays $B_d^0 \to K^* l^+ l^-$ in scalar leptoquark model

We study the effect of scalar leptoquarks on the exclusive rare $B$ meson decays $\bar{B}_d^0 \rightarrow \bar{K}^{* 0}\left(\rightarrow K^-π^+\right) l^+ l^-$ in the full kinematically accessible physical region. We work out the constraints on leptoquark parameter space using the measured branching ratio of $B_s \rightarrow μ^+ μ^-$ process by the CMS and LHCb collaborations. We compute the branching ratio, forward-backward asymmetry and isospin asymmetry distribution using the constrained parameter space. We also look into various form factor independent and CP violating observables in the s…

半轻子和排他稀有B衰变

Semileptonic and Exclusive Rare B Decays

稀有衰变$B \ra K^\ast γ$发生在反冲最大的区域$q^{2}=0$，这给非相对论性夸克模型带来了问题，而非相对论性夸克模型通常被认为在零反冲时最可靠。Bauer Stech Wirbel（BSW）模型采用无限动量标架（IMF）形式，设计用于$q^2=0$。我们证明了在这个模型中，与半轻子衰变$B\ra ρe {\bar ν}$的衰变$B \ra K^\ast γ$和$q^2$ --谱相关的比率，在SU（3）味对称极限中变得与波函数无关。我们表明，这一功能也是真实的相对论夸克模型制定的IMF或轻锥形式主义，如果$b$夸克是无限重。事实上，这些相对论模型，它有一个不同的自旋结构从BSW的情况下，减少到BSW模型在重$b$ -夸克极限。因此，直接测量半轻子衰变的$q^2$ -能谱可以为稀有衰变提供精确的信息。

Study of rare semileptonic $B_c^+ \to D^+ ν\barν$ decay in the light-cone quark model

We study the exclusive semileptonic rare $B_c^+ \to D^+ ν\barν$ decay in the framework of light-cone quark model. The transition form factors $f_{+}(q^2)$ and $f_{T}(q^2)$ are evaluated in the time-like region using the analytic continuation method in $q^{+} = 0$ frame. The analytic solutions of these form factors are compared with the results obtained from the double pole parametric form. The branching ratio for $B_c^+ \to D^+ ν\barν$ decay is calculated and compared with the other theoretical model predictions. The predicted results in this model can be tested at the LHCb experiments in near…

稀有半轻子B衰变中的CP破坏和超对称性

CP Violation in rare semileptonic B decays and supersymmetry

本文研究了在半轻子衰变B-> Xsll和B->K（*）ll（l=e，μ）中夸克质量矩阵中出现的新味变超对称相的效应.超对称性效应的参数化使用质量插入近似形式主义。考虑对来自其他过程的SUSY贡献的约束（例如，b->s γ，B->K* 11）。电荷和胶子贡献光子和Z介导的衰变被包括在内，并考虑非微扰修正。我们研究了CP（和前向-后向）不对称性与包含分支比的期望值之间的相关性。几种可能的情况进行了区分和讨论，根据被认为是大规模插入。

Predicting the $B -> ρ$ form factors using AdS/QCD Distribution Amplitudes for the $ρ$ meson

We use QCD light-cone sum rules (LCSR) with holographic anti de Sitter/Chromodynamics (AdS/QCD) Distribution Amplitudes (DAs) for the $ρ$ meson to predict the form factors that govern the leading amplitudes of the rare radiative $B -> ργ$ decay and the semileptonic decay $B -> ρl ν$. We test the Isgur-Wise relation between the radiative and semileptonic form factors. We also compute the total width (in units of $|V_{ub}|^2$) for the semileptonic decay $B -> ρl ν$ as well as ratios of partial decay widths which are independent of $|V_{ub}|$.

半轻子稀有B衰变的NNLO分析

NNLO Analysis Of Semileptonic Rare B Decays

我们更新了衰变B ->（K，K*，Xs）l^+ l^-的分支比的标准模型预测，其中l=e，μ。利用BR（B -> Xs γ）和BR（B -> Kl ^+ l^-）的测量值以及BR（B ->（K*，Xs）l^+ l^-）$的上限，我们计算出了相关Wilson系数的与模型无关的界限。我们展示了这种界限对MSSM的参数空间的影响，最小的味道违反和超对称模型的味道变化的额外来源。

Current-component independent transition form factors for semileptonic and rare $D\to π(K)$ decays in the light-front quark model

We investigate the exclusive semileptonic and rare $D\to π(K)$ decays within the standard model together with the light-front quark model (LFQM) constrained by the variational principle for the QCD-motivated effective Hamiltonian. The form factors are obtained in the $q^+=0$ frame and then analytically continue to the physical timelike region. Together with our recent analysis of the current-component independent form factors $f_\pm(q^2)$ for the semileptonic decays, we present the current-component independent tensor form factor $f_T(q^2)$ for the rare decays to make the complete set of hadro…

Model independent investigation of rare semileptonic b \to u l \barν_l decay processes

Motivated by the recent observation of lepton universality violation in the flavour changing charged current transitions $b \to c l \barν_l$, we intend to scrutinize the lepton non-universality effects in rare semileptonic $B$ meson decays involving the quark level transitions $b \to u l \barν_l$. In this regard, we envisage the model-independent approach and consider the generalized effective Lagrangian in the presence of new physics and constrain the new parameters by using the experimental branching fractions of $B_u^+ \to l^+ ν_l$ and $B^- \to π^0 μ^- \bar ν_μ$ processes, where $l=e, μ, τ$…

独家稀有衰变$B\rightarrow K^{\ast}γ$

Exclusive Rare Decay $B\rightarrow K^{\ast}γ$

利用重夸克对称性和$SU(3)$味对称性证明了排他性衰变$B\rightarrow K^{\ast}γ$与半轻子衰变$B\rightarrowρe\barν$的关系.直接测量半轻子衰变的$q^{2}$能谱可以提供有关稀有衰变的信息。

QCD相对论势模型中的半轻子和稀有$B$ -介子跃迁

Semileptonic and Rare $B$-meson transitions in a QCD relativistic potential model

本文用QCD相对论势模型计算了重介子轻子常数，计算了$B\toρ\ellν$，$B\to K^*γ$和$B\to K^*\ell^+\ell^-$的形状因子.在我们的方法中，重介子被描述为一个$Q\bar q$束缚态，其波函数是相对论Salpeter方程的解，其瞬时势在小距离处表现为库仑行为，在大距离处表现为线性行为。根据矢量介子占优假设，用矢量流插值场描述了光矢量介子。对于不构成重介子的夸克，假定Pauli-Villars正则化传播子。我们的方法避免了用波函数和组分夸克描述轻介子，从而避免了提高轻介子波函数的问题。假设作为输入的实验结果$B\to K^*γ$，我们评估所有的形状因子描述的$B\to ρ, K^*$半轻子和罕见的过渡。与现有数据的总体比较是令人满意的。

标准模型中辐射和半轻子稀有B衰变的次领先级计算及其与数据的比较

Next-to-leading Order Calculations of the Radiative and Semileptonic Rare B Decays in the Standard Model and Comparison with Data

我们回顾了在标准模型（SM）中以次领先阶精度计算的一些稀有B衰变。这些包括辐射衰变$B \to (X_s,K^*,ρ)γ$和半轻子衰变$B \to (X_s,K,K^*) \ell^+ \ell^-$，其中来自BABAR和BELLE合作的新数据已在本次会议上提交。在理论和实验误差范围内，SM与电流测量值一致。定量地讨论了稀有B衰变对CKM现象的影响。

超对称理论中的排斥半轻子稀有衰变$B ->_ ($ K，K^*）\ell^+ \ell^-

Exclusive semileptonic rare decays $B ->_ ($K,K^*) \ell^+ \ell^- in supersymmetric theories

在超对称背景下分析了互斥过程$B\to K(K^*)\ell^+ \ell^-, \ell=μ, τ$的不变质量谱、前后不对称性和轻子极化。特别注意中性希格斯玻色子（NHB）的影响。我们的分析表明，中性希格斯玻色子的作用可以在很大程度上改变过程$\bkm$的分支比，并且前后不对称性不会消失.对于过程$\bksm$，轻子的横向极化对NHB的影响非常敏感，而不变质量谱、前后不对称性和轻子的纵向极化对NHB的影响不敏感。对于$\bkt$和$\bkst$，NHB的作用是相当显著的。我们还分析了这些过程的部分衰变宽度，结果表明，即使在计算弱形状因子时考虑到理论上的不确定性，NHB的影响也会使超对称性出现.

Form factors for semileptonic, nonleptonic and rare $B\, (B_s)$ meson decays

We provide new values for the model parameters of the covariant constituent quark model (with built--in infrared confinement) in the meson sector by a fit to the leptonic decay constants and a number of electromagnetic decays. We then evaluate, in a parameter free way, the form factors of the $B(B_s)\to P(V)$-transitions in the full kinematical region of momentum transfer. As an application of our results we calculate the widths of the nonleptonic $B_s$-decays into $D_s^- D_s^+,$ $D_s^{\ast\,-} D_s^{+}+D_s^- D_s^{\ast\,+}$ and $D_s^{\ast\,-} D_s^{\ast\,+}$. These modes give the largest contrib…

稀有B衰变超过B-> Xs γ

Rare B decays beyond B-> Xs gamma

我讨论最近的进展，我们的理解独家罕见的和半轻子衰变。我显示的HQET的影响时，结合在大能量极限的QCD的预测，首先集中在应用程序$B\to K^*\ell^+\ell^+$。我还讨论了半轻子的形式因素，出现在HQET/LEET与使用辐射衰变数据的限制，并更新这些包括下一个领先的顺序贡献的影响，在$B\to K^*γ$，以及最新的数据。

稀有衰变$B\to K^{\ast}γ$的更精确计算

The Rare Decay $B\to K^{\ast}γ$: A More Precise Calculation

从已知的包容性衰变$b\to sγ$预测罕见的排斥性衰变$B\to K^{\ast}γ$的努力由于大反冲动量的影响而受挫。我们利用B衰变中的重夸克对称性和SU（3）味对称性，通过将$B\to K^{\ast}γ$与半轻子过程$B\toρe\barν$联系起来，说明如何减少计算这种衰变时的大的不确定性。直接测量半轻子衰变的$q^{2}$能谱可以为稀有衰变提供精确的信息。

辐射和半轻子稀有B衰变中改进的QCD微扰贡献和功率修正

Improved QCD perturbative contributions and power corrections in radiative and semileptonic rare B decays

利用$(1/m_b)$中的重夸克展开（HQE）和B强子中B夸克束缚的费米运动效应的唯象模型，在标准模型中计算了稀有包含\bxsll衰变的衰变率、分布和强子谱矩的主导功率修正.在HQE和Fermi运动模型中，我们考虑了次首阶微扰QCD修正，计算了谱、衰变率和强子矩对模型参数的依赖关系。在后者中，我们考虑了长距离效应通过$B \to X_s +(J/ψ, ψ^\prime,...) \to X_s \ell^+ \ell^- $与矢量介子的优势anterior和研究双轻子和强子不变质量的运动学削减的分支比，强子谱和强子矩的影响。我们提出了领先的对数QCD校正的$b \to s γγ$振幅。在标准模型中给出了QCD微扰改进的$B_{s}\toγγ$分支比，包括我们对$B_s \to ϕγ\to γγ$和$B_s \to ϕψ\to ϕγ\to γγ$衰变的长距离效应的估计。计算了重正化标度和HQE激发的束缚态模型参数引起的不确定度。

Rare semileptonic decays of B and B_c mesons in the relativistic quark model

Rare semileptonic decays of B and B_c mesons are investigated in the framework of the QCD-motivated relativistic quark model based on the quasipotential approach. Form factors parametrizing the matrix elements of the weak transitions between corresponding meson states are calculated with the complete account of the relativistic effects including contributions of intermediate negative energy states and relativistic transformations of the meson wave functions. The momentum transfer dependence of the form factors is reliably determined in the whole accessible kinematical range. On this basis the …

SUSY SO（10）GUT中唯一的半轻子稀有衰变$B \to K^{(*)} l^+ l^-$

Exclusive Semileptonic Rare Decays $B \to K^{(*)} l^+ l^-$ in a SUSY SO(10) GUT

在超对称SO（10）大统一理论的背景下，我们研究了互斥过程$B \to K^{(*)} l^+l^-(l=μ,τ)$ .利用中性Higgs玻色子（NHB）企鹅引起的新算符$Q_{1,2}^{(\prime)}$等相关算符的Wilson系数，我们计算了与这些过程相关的一些可能观测量，如不变质量谱（IMS）、轻子对前后不对称性（FBA）、轻子极化不对称性等。在这个模型中，Wilson系数$C_{Q_{1,2}}^\prime$的贡献在新的贡献中占主导地位。结果表明，NHB效应对$B \to K^{(*)} τ^+ τ^-$衰变的FBA、$dL/d\hat{s}$和$dT/d\hat{s}$敏感，可望在B厂测得，$B \to K μ^+ μ^-$的正常极化$dN/d\hat{s}$平均值可达百分之几，而$B\to K τ^+τ^-$的正常极化$dN/d\hat{s}$平均值约为0.05。这将为未来的超级B工厂提供测量数据，并为探索新物理和区分不同模型提供有用的信息。

Implication of Z-mediated FCNC on semileptonic decays $B_s\toϕl^+l^-$ and $B^+\to K^+ l^+ l^-$

Rare B meson decays mediated by flavour changing neutral current (FCNC) transition play interesting role to probe the flavour sector of the standard model (SM). Generally at the tree level, FCNC processes are not allowed in the SM but occurs at the loop levels. This gives an excellent hunting ground for new physics (NP). From various experimental studies it is found that the FCNC processes having quark level transition $b \to s$ are challenging. Here, we investigate different kinematic observables like forward-backward asymmetry, differential branching ratio and lepton polarization asymmetry f…

排斥半轻子B -> pi^+ pi^- l^+ l^-衰变的模型无关分析

Model-independent analysis of the exclusive semileptonic B -> pi^+ pi^- l^+ l^- decay

对B -> pi^+ pi^- l^+ l^-衰变进行了与模型无关的分析。详细研究了各种物理可测不对称性和CP破坏不对称性对新Wilson系数的依赖性。观察到不同的可测量分位数对不同的新Wilson系数非常敏感，即，标准模型之外的新物理的存在。

Rare semileptonic $B\to K^* \ell^+ \ell^- $ decays in RS$_c$ model

Recent LHCb measurements show small discrepancies with respect to the Standard Model (SM) predictions in selected angular distributions of the mode $B^0 \to K^{*0} μ^+ μ^-$. The possibility of explaining such tensions within theories beyond the SM crucially depends on the size of the deviations of the Wilson coefficients of the effective Hamiltonian for this mode, in comparison to their SM values. We analyse this issue in the framework of the Randall Sundrum model with custodial protection (RS$_c$); in our study we also consider the mode with $τ$ leptons in the final state. We discuss the smal…

Effects of scalar leptoquark on semileptonic $Λ_b$ decays

We study the scalar leptoquark effects on the rare semileptonic decays of $Λ_b$ baryon, governed by the quark level transition $b \to s l^+ l^-$. We estimate the branching ratios, forward-backward asymmetries, lepton polarization parameters and the lepton flavour non-universality effects in these decay channels. We find significant deviations from the corresponding standard model predictions in some of the observables due to leptoquark effects. We also investigate the lepton flavour violating decays $Λ_b \to Λl_i^- l_j^+$, the branching ratios of which are found to be ${\cal O}(10^{-10} - 10^{…

Charming new physics in rare B-decays and mixing?

We conduct a systematic study of the impact of new physics in quark-level $b \to c \bar{c} s$ transitions on $B$-physics, in particular rare $B$-decays and $B$-meson lifetime observables. We find viable scenarios where a sizable effect in rare semileptonic $B$-decays can be generated, compatible with experimental indications and with a possible dependence on the dilepton invariant mass, while being consistent with constraints from radiative $B$-decay and the measured $B_s$ width difference. We show how, if the effect is generated at the weak scale or beyond, strong renormalisation-group effect…

硬墙 AdS/QCD 框架下 $N_{f}=5$ 重矢量介子的半轻子衰变

Semileptonic Decays of Heavy Vector Mesons in Hard-Wall AdS/QCD with $N_{f}=5$

本文在硬墙 AdS/QCD 框架下系统计算了重矢量介子半轻子衰变的跃迁形状因子与分支比，覆盖四种夸克跃迁，并与非微扰方法结果比较。

CP-odd窗口探究稀有半轻子$B$衰变中的长距离动力学

CP-odd window into long distance dynamics in rare semileptonic $B$ decays

通过组合测量CP平均衰变率和直接CP不对称性，构造CP-odd衰变率差异比值，利用U-spin关系探测稀有半轻子B衰变中的四夸克算符贡献并区分新物理效应。

Study of rare mesonic decays involving di-neutrinos in their final state

We have carried out phenomenological implication of R-parity violating ($\NEG% {R}_{p}$) Minimal Supersymmetric Model (MSSM) via analyses of pure leptonic($% M\rightarrow ν\barν$) and semileptonic decays of pseudo-scalar mesons(% $M\rightarrow Xν\barν$). These analyses involve prediction of branching fraction of pure leptonic decays by using experimental limits/bounds derived from the study of semileptonic decays on $\NEG{R}_{p}$ parameters. We have found, in general that $\NEG{R}_{p}$ contribution dominates over the SM contribution i.e., by a factor of $10^{2}$ for the semleptonic decays of $…

Rare B decays

Rare radiative, leptonic and semileptonic B meson decays are valuable probes of physics beyond the Standard Model. This talk reviews the sensitivity to new physics of observables related to two rare B decays to be measured in the near future at LHC, B(s) -> mu+ mu- and B -> K* mu+ mu-.

稀有K衰变与标准模型之外的新物理

Rare K Decays and New Physics Beyond the Standard Model

稀有衰变提供了一个互补的窗口，直接对撞机搜索作为物理学的探针超越标准模型。我们提出了一个概述的新物理学的灵敏度提供了现有的和未来的测量罕见的轻子和半轻子$K$衰变的几类模型的背景下。

几种罕见的矢量介子弱衰变

On Some rare weak decays of vector mesons

在最流行的夸克模型框架下研究了矢量介子的半轻子弱衰变。不幸的是，预测的分支比太小，无法在正在建设的介子工厂中对这些衰变进行现实的研究。

Rare K and B decays with non-standard missing energy

The rare K and B semileptonic decays into neutrino pairs are well-known to be extremely sensitive to non-standard physics in the quark sector. In this talk, their capabilities to signal New Physics in the leptonic sector, or even to reveal entirely new invisible sectors, are analyzed.

Light-front holography in $B$ physics

We use AdS/QCD holographic Distributions Amplitudes for the vector mesons $ρ$ and $K^*$ in order to predict the radiative decays $B \to ργ$ and $B \to K^* γ$ as well as the semileptonic decays $B \to ρl ν$ and $B \to K^* μ^+ μ^-$. For the radiative decays, we find that the AdS/QCD DAs offer the advantage of avoiding end-point singularities when computing power suppressed contributions. For the semileptonic decays $B \to ρl ν$ and $B \to K^* μ^+ μ^-$, we compare our predictions to the latest BaBar and LHCb data respectively.

$B\toρ$, $K^*$ transition form factors in AdS/QCD model

We use the AdS/QCD distribution amplitudes for light mesons to calculate the transition form factors for B to $ρ$, $K^*$ decays. These form factors are then utilized to make predictions for the semileptonic $B\toρ\ellν$ and dileptonic $B\to K^* μ^+μ^-$ decays. We compare our predictions to the experimental data from BaBar and LHCb.

排他稀有B衰变终点区理论

Theory of the endpoint region of exclusive rare B decays

在B和D与K* 和ρ介子的辐射和半轻子衰变速率的比值中，不可计算的形状因子大部分被抵消。由此产生的方法确定Vub是在很大程度上免费的强子的不确定性，提高了一个精确的Vub测定的前景。

Experimental study for leptonic and semileptonic decays in the charm sector

Leptonic and semileptonic decays in the charm sector have been well studied in recent years. With the largest data sample near $D\bar D$ threshold, precision measurements of leptonic and semileptonic decays of charm meson and baryon are perfromed at BESIII. Test for letpon flavor universality is also performed. Sensitivity for rare leptonic and semileptonic charm decays is significantly improved taking advantage of the huge statistics in LHCb and the $B$ factories.

正规化包容稀有B衰变

Normalizing inclusive rare B decays

包含半轻子分支比常被用来规范化其他包含B衰变。利用最近确定的算子乘积展开的非微扰参数，我们计算了B->X_s γ的分支比的归一化因子，并发现相对于以前的确定有几个百分点的增强。

The Semileptonic $B$ to $K_1(1270,1400)$ Decays in QCD Sum Rules

We analyze the semileptonic rare decays of $B$ meson to $K_{1} (1270)$ and $K_{1} (1400)$ axial vector mesons. The $B\to K_{1} (1270,1400) \ell^+ \ell^-$ decays are significant flavor changing neutral current decays of the $B$ meson. These decays are sensitive to the new physics beyond SM, since these processes are forbidden at tree level at SM. These decays occurring at the quark level via $b\to s \ell^+ \ell^- $ transition, also provide new opportunities for calculating the CKM matrix elements $V_{bt}$ and $V_{ts}$. In this study, the transition form factors of the $B\to K_{1} (1270,1400) \e…

Heavy Flavour Physics

The current status of the theory and phenomenology of weak decays of hadrons containing a heavy quark is reviewed. Exclusive semileptonic and rare decays of $B$ mesons are discussed, as well as inclusive decay rates, the semileptonic branching ratio of the $B$ meson, and the lifetimes of $b$-flavoured hadrons. Determinations of $α_s$ from $Υ$ spectroscopy are briefly presented.

Forward-backward and CP-violating asymmetries in rare B_{d,s}\to (V,γ) l^+l^- decays

We study the forward-backward and the CP-violating asymmetries (both time-independent and time-dependent) in rare semileptonic $B_d\toρ^0 l^+l^-$, $B_s\toϕl^+l^-$, and radiative leptonic $B_{d,s}\to γl^+l^-$ decays and investigate the sensitivity of these asymmetries to the extensions of the Standard model.