Upper limits on electric dipole moments of tau-lepton, heavy quarks, and W-boson
A. G. Grozin, I. B. Khriplovich, A. S. Rudenko
我们讨论了τ轻子，重夸克和W玻色子的电偶极矩（EDM）的上限，这是从电子和中子EDM的精确测量得出的。
We discuss upper limits on the electric dipole moments (EDM) of the tau-lepton, heavy quarks, and W-boson, which follow from the precision measurements of the electron and neutron EDM.
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Limits on excited tau leptons masses from leptonic tau decays
研究了激发态轻子对轻子τ衰变的影响。用一个通用的有效拉格朗日方法来描述激发轻子的耦合，我们计算它们对轻子衰变的贡献，并使用当前的实验值的分支比的激发态的质量和子结构规模的限制。
Two Higgs Doublet Model and Lepton Polarization in the B -> K tau+ tau- Decay
本文计算了双Higgs模型中（B -> K τ ^+ τ ^-）排斥衰变的衰变宽度、前后不对称性和τ轻子的纵、横极化。结果表明，τ轻子的前后不对称性和纵向极化是建立新物理的有效工具。
Excited tau lepton contribution to $W->tau nu(tau)$ decay at the one-loop level
本文用有效的拉格朗日方法研究了τ轻子对顶点W-tau-nu（τ）的复合效应。我们认为只构成第三族，并得到了对非普适轻子耦合g_（tau）/g_（e）的修正。由于W衰变中非普适轻子耦合的实验边界很弱，我们发现激发粒子的贡献并没有给出激发质量的实际限制，因为它们导致λ <m*。
Lepton-Flavor Violating Decay of Tau Lepton in the Supersymmetric Seesaw Model
目前，KEK B工厂的Belle实验正在改进τ轻子的轻子味破坏（LFV）衰变模的边界。本文利用现有的中微子振荡数据，在超对称跷跷板模型中讨论了τ轻子的LFV衰变。
Lepton flavor violation in tau and mu processes is studied in the littlest Higgs model with T-parity. We consider various asymmetries defined in polarized tau and mu decays. Correlations among branching ratios and asymmetries are shown in the following lepton flavor violation processes: mu+ --> e+ gamma, mu+ --> e+ e+ e-, mu- A --> e- A (A = Al, Ti, Au and Pb), tau+ --> mu+ gamma, tau+ --> mu+ mu+ mu-, tau+ --> mu+ e+ e-, tau+ --> mu+ P (P = pi0, eta and eta'), tau+ --> mu+ V (V = rho0, omega and phi), tau+ --> e+ gamma, tau+ --> e+ e+ e-, tau+ --> e+ mu+ mu-, tau+ --> e+ P, tau+ --> e+ V, tau…
As of version 8.150 of Pythia, the isotropic decay model of tau-leptons has been replaced with sophisticated tau-lepton decay machinery. The decays and spin correlations for tau-leptons in Pythia 8 are described, including the spin correlation algorithm, the available tau-lepton production processes, the tau-lepton decay models, the user interface, and the implementation.
QCD Analysis of hadronic tau lepton decays
毕业论文写在约翰内斯古腾堡大学美因茨。
Inclusion of tau anomalous magnetic and electric dipole moments in the KORALZ Monte Carlo
我们描述的修改KORALZ版本4.03，以允许异常的磁和电的偶极矩的τ。我们讨论的方法在LEP 1能量的验证。
TAUOLA the library for tau lepton decay, and KKMC/KORALB/KORALZ/... status report
评述了高能加速器实验中$τ$轻子产生和衰变的蒙特卡罗模拟程序的现状。特别讨论了下列程序包的现状：（i）用于τ轻子衰变的TAUOLA，（ii）用于衰变辐射修正的PHOTOS，（iii）用于e+e碰撞中产生τ对的KORALB，KORALZ，KKMC程序包和（iv）用于“任何”发生器产生的τ轻子衰变的TAUOLA通用接口。特别强调新的和未来的实验的要求。同时保持不同的物理初始化TAUOLA的软件组织的一些考虑也包括在内。
Lepton polarization and CP-violating effects in "B -> K^* tau^+ tau^-" decay in standard and two Higgs doublet models
导出了最一般的轻子CP破坏不对称性、纵、横和法向极化的模型无关表达式。讨论了这些一般性结果在具体模型如标准模型和三种不同类型的双Higgs二重态模型中的应用。
TAUOLA is a Monte Carlo generator dedicated to generating tau-lepton decays and it is used in the analysis of experimental data both at B-factories and LHC. TAUOLA is a long-term project that started in the 90's and has been under development up to now. In this note we discuss the status of the predominant hadronic tau-lepton decays into two ($Br \simeq 25.52\%$) and three pions ($Br \simeq 18.67\%$).
It has been pointed out recently that current low-energy constraints still allow for sizable flavor-changing decay rates of the 125 GeV boson into leptons, h -> tau ell (ell= e, mu). In this work we discuss the role of hadronic tau-lepton decays in probing lepton flavor violating couplings in the Higgs sector. At low energy, the effective Higgs coupling to gluons induced by heavy quarks contributes to hadronic tau decays, establishing a direct connection with the relevant process at the LHC, pp (gg)-> h -> tau ell. Semileptonic transitions like tau -> ell pi pi are sensitive to flavor-changing…
Propagation of tau neutrinos and tau leptons through the Earth and their detection in underwater/ice neutrino telescopes
如果宇宙源产生的μ介子中微子振荡，中微子望远镜就有机会探测到τ中微子。与μ介子中微子相反，由于带电电流相互作用产生的τ轻子的寿命很短，地球对τ中微子是完全透明的。τ轻子在飞行中衰变，产生另一个τ中微子（再生链）。因此，τ中微子穿过地球时不会被吸收，尽管在再生过程和中性流相互作用中都会损失能量。所有类型的中微子都可以在深海/冰探测器中通过中微子相互作用中产生的带电轻子发出的切伦科夫光来探测。μ子和τ轻子具有不同的能量损失特征，这为在众多μ子中识别τ事件提供了机会。在文献中已经提出了一些可以被牢固建立并且没有背景的τ轻子的签名，例如“双爆炸”事件。在本文中，我们提出的蒙特卡罗模拟的结果，τ中微子通过地球的传播占中微子相互作用，τ能量损失和τ衰变。硬的部分和校正的光核截面的软的部分（这有助于一个主要部分的tau能量损失）的参数化。本文讨论了在大型水下/冰中微子望远镜中鉴别τ轻子的不同方法。最后，我们给出了在立方千米尺度探测器中τ中微子双爆事件率的计算。
Model independent bounds on the tau lepton electromagnetic and weak magnetic moments
利用LEP 1、SLD和LEP 2的τ轻子产生数据以及CDF、D 0和LEP 2的W衰变为τ轻子的数据，我们对τ轻子的非标准电磁矩和弱磁矩设定了与模型无关的极限。最一般的有效拉格朗日产生的tau时刻使用没有进一步的假设。从分析中设置了非标准模型对τ电磁（$-0.007<a_γ< 0.005$）、τ Z-磁（$-0.0024 <a_Z< 0.0025$）和τ W-磁（$-0.003 < κ^W < 0.004$）偶极矩的贡献的精确界限（$2σ$）。
Recent Progress on Tau Lepton Physics
本文综述了强子τ衰变的一些重要方面：由τ强子宽度确定α s，τ强子宽度的测量，τ强子衰变中α s的测量等。|V_{us}|通过Cabibbo抑制的τ衰变，以及τ-> nu_τ K π谱的理论描述。其他相关的电弱主题的现状，如带电电流普适性检验或轻子味破坏的界限，已经在以前的评论中总结过。
The Tau Lepton and the Search for New Elementary Particle Physics
第五届国际WEIN研讨会致力于超越标准模型的物理学。这个演讲是关于τ轻子物理的，但我首先要问一个问题：我们知道如何在基本粒子的世界里找到新的物理吗？这个问题与各种tau物理学主题交织在一起。这些主题是：寻找意想不到的τ衰变模式;寻找额外的τ衰变机制;辐射τ衰变; W，B和D的τ衰变模式; Z^0到τ对的衰变;寻找τ衰变中的CP破坏; τ中微子，τ物理学中的梦想和奇怪的想法;以及未来几十年的τ研究设施。
The tau anomalous magnetic moment (a_tau) and electric dipole moment (d_tau) have not yet been observed. The present bounds on their values are of order 10^-2 and 10^-17 e*cm, respectively. We propose to measure a_tau with a precision of O(10^-3) or better and improve the existing limits on d_tau using precise tau- -> l- nu_tau \bar{nu}_l gamma (l=e or mu) data from high-luminosity B factories. A detailed feasibility study of this method is underway.
The inclusive tau lepton hadronic decay and its description within Dispersive approach to Quantum Chromodynamics are briefly discussed.
Effective CP-violating operators of the tau lepton and some of their phenomenologies
研究了含τ轻子的六维CP破坏SU_L（2）\times U_Y（1）不变算子.从现有的实验数据上的τ偶极矩的约束。在电流约束条件下，在未来的τ-粲工厂中，τ-> 3πν_τ中可能观察到诱导的CP破坏效应。
For some time the measured value of tau-lepton mass continues to approach closer and closer a particular figure 1776.80 MeV predicted by an intrinsically composite model of three generations of leptons and quarks, introduced almost two decades ago. In the framework of this model, we recall briefly the argument standing behind our prediction.
Bounds On Anomalous Magnetic And Electric Moments Of Tau Lepton From LEP And Lepton Flavor Violation
τ轻子的反常磁偶极矩和电偶极矩的最严格的界限是由埃斯克里巴诺和马索[6]从LEP的Z宽度在一个有效的拉格朗日新物理方法中推导出来的。本文指出，Escribano和Massó引入的高维算符不仅将τ轻子的中性流修改为Z规范玻色子和光子，而且诱导轻子味破坏（LFV）。LFV效应的大小主要取决于轻子质量产生的动力学。假设轻子质量矩阵为Fritzsch反序形式，指出$μ\to e γ$的实验极限将把τ轻子的反常磁矩和电偶极矩分别推到$10^{-11}$和$10^{-25} e cm$.
Heavy-Neutrino Effects on tau-Lepton Decays
在大统一理论或具有E_6对称性的超弦模型的推动下，对标准模型进行最小的扩展，自然可以预言Dirac或Majorana性质的重中微子。这样的重中性轻子违反了单圈电弱序下的解耦定理，因此为τ轻子可能的轻子味衰变提供了一个独特的机会，例如在LEP实验中看到τ-> τ或τ-> μ。我们分析了三代和四代模型中的这种衰变。
P and T Odd Asymmetries in Lepton Flavor Violating Tau Decays
我们计算了在e^+ e^-对撞机上产生的τ粒子中的一个衰变到轻子味的破坏末态（如τ-> μ γ，τ-> 3 μ，τ-> μ ee）的过程的微分截面。我们可以得到轻子味非守恒相互作用的宇称和CP破坏的信息。这里导出的公式在区分不同的模型时是有用的，因为每一个超出标准模型的物理模型预测不同的角相关。我们还计算了主要的背景过程的角分布τ-> l伽玛搜索，即τ-> l nu \bar ν伽玛，并讨论了有用的角度相关的背景抑制。
Status of tau lepton decay Monte Carlo generator TAUOLA, and its main recent applications are reviewed. It is underlined, that in recent efforts on development of new hadronic currents, the multi-dimensional nature of distributions of the experimental data must be taken with a great care. Studies for H to tau tau; tau to hadrons indeed demonstrate that multi-dimensional nature of distributions is important and available for evaluation of observables where tau leptons are used to constrain experimental data. For that part of the presentation, use of the TAUOLA program for phenomenology of H and…
The tau lepton plays important role in the correlation between the low-energy neutrino oscillation data and the lepton flavor structure in heavy neutrino decay. We investigate the lepton flavor signatures with tau lepton at hadron collider through lepton number violating (LNV) processes. In the Type I Seesaw with U$(1)_{\rm B-L}$ extension, we study the pair production of heavy neutrinos via a $Z'$ resonance. We present a detailed assessment of the search sensitivity to the channels with tau lepton in the subsequent decay of heavy neutrinos. For the benchmark model with $Z'$ only coupled to th…
The tau weak-magnetic dipole moment
我们在标准模型中计算了τ轻子在$q^2=M_Z^2$的反常弱磁形状因子的预言。当所有粒子都在壳层上时，这是一个电弱规范不变量。其值为$a_τ^w (M_Z^2)= - \;(2.10 + 0.61\, i) \times 10^{-6}$。我们发现，在$e^+e^-$非极化碰撞产生的tau对的单tau极化的横向和正常的组成部分是敏感的真正的和吸收部分的异常弱磁偶极矩的tau。讨论了在LEP下测量这种偶极矩所能达到的灵敏度。
Testing CP, T and (V-A) Symmetry through Tau Leptons
τ衰变对称性破坏的模型无关检验对于确定τ轻子是基本的还是宏观的很重要。这样的测试也是解决悬而未决的“e - mu - tau”难题的重要步骤。这次演讲回顾了这样的测试的背景下，一般治疗的两体τ衰变，只假设洛伦兹不变性和树状结构的τ-antitau生产衰变序列。直接测量极化部分宽度和相关的“横向W交换”干涉强度，将为区分希格斯玻色子、τ中微子和τ中微子的基本/宏观理论提供重要的探针。类似的目标和技术也适用于顶夸克衰变。
Theory of the tau lepton anomalous magnetic moment
本文回顾和更新了τ轻子g-2的标准模型预言。更新的QED和电弱的贡献，连同新的值的领导阶强子项，根据最近的低能量e + e-数据从BaBar，CMD-2，KLOE和SND，和强子光的光的贡献。总的预测面临的τ轻子异常的现有实验界限，并简要讨论了其未来的测量前景。
Electric and Magnetic Tau Dipole Moments Revisited
本文回顾了陶轻子反常磁偶极矩和电偶极矩的理论预言与实验测量，并指出其短寿命和高质量带来的独特挑战。
Tau weak dipole moments from azimuthal asymmetries
我们发现，横向和正常的单$tau$极化的$tau$对产生的$e^+$ $e^-$非极化碰撞，在$Z$峰，是敏感的弱（磁和电）的$tau$的偶极矩。我们还展示了这些组件的$τ$极化是如何通过测量适当的方位角不对称性的角分布的衰减产物。可以实现对于弱电偶极矩的$10^{-18}$ $e\cdot cm$级和对于$τ$的弱磁偶极矩的实（虚）部的$10^{-4}$（$10^{-3}$）级的灵敏度。从自旋-自旋相关的不对称性也提出了兼容的边界。
Theoretical description of inclusive tau lepton hadronic decay is performed in the framework of Dispersive approach to QCD. The significance of effects due to hadronization is demonstrated. The approach on hand is capable of describing experimental data on tau lepton decay in vector and axial-vector channels. The vicinity of values of QCD scale parameter obtained in both channels testifies to the self-consistency of developed approach.
Mu-Tau Reflection Symmetry in Lepton Mixing and Neutrino Oscillations
我们研究了轻子混合矩阵可能表现出一种强形式的μ-τ普适性的可能性，其中μ-和τ-中微子味本征态的相应元素具有相等的模，并发现它与目前关于中微子振荡的数据是一致的。我们指出，在狄拉克的情况下，这是相当于对称下的μ-τ反射，即。MNS矩阵中的mu-tau味交换与整个轻子扇区上的CP变换的组合操作。我们给出了这种混合矩阵的最一般形式，研究了在这种对称性下的轻子质量矩阵，并探讨了对称性在中微子振荡中的可观测表现。
Using the effective Lagrangian formalism, the anomalous magnetic and electric dipole moments of the tau-lepton in the $μ^{+}μ^{-} \rightarrow μ^{+}γ^{*} γ^{*} μ^{-}\rightarrow μ^{+}τ\barτμ^{-}$ process at the future muon colliders at the $\sqrt{s}=1.5, 3$ and $6$ TeV are investigated. In addition, the bounds at the $95\%$ confidence level on the dipole moments of the tau-lepton using different integrated luminosities are estimated. It is shown that the $μ^{+}μ^{-} \rightarrow μ^{+}γ^{*} γ^{*} μ^{-}\rightarrow μ^{+}τ\barτμ^{-}$ process leads to a remarkable improvement in the existing experimen…
Model-independent Analysis of Lepton Flavour Violating Tau Decays
许多超越标准模型的物理模型都预言带电轻子的轻子味破坏衰变，其水平可能很快就能观测到。在本文中，我们研究了一个Tau衰变成三个带电轻子在一般的方式，有效场论方法的基础上，其中相关的运营商进行分类，根据他们的手征结构。我们计算出衰变的分布，并讨论了其现象学意义。
Upper Limits on Electric and Weak Dipole Moments of Tau-Lepton and Heavy Quarks from e+e- Annihilation
利用在LEP上测量的2 E ~ 200 GeV电子+电子湮灭为τ + τ-、c \bar{c}和b \bar{b}的总截面，导出了电偶极矩的上限分别为3*10^{-17}、5*10^{-17}、2*10^{-17} e*cm和4*10^{-17}、7*10^{-17}、2.5*10^{-17} e*cm，分别用于τ轻子、c夸克和b夸克的弱偶极矩。这些时刻的一些现有的限制是改进和b-夸克的改进是相当显着的。
An empirical mass formula for mu and tau leptons and some remarks on trident production
对于自由参数的整数值，经验公式可以很好地再现$μ$和$τ$轻子的质量值，就好像它们是电子的激发态一样，三叉戟的产生可能是由于组分碰撞。
The tau lepton plays important role in distinguishing neutrino mass patterns and determining the chirality nature in heavy scalar mediated neutrino mass models, in the light of the neutrino oscillation experiments and its polarization measurement. We investigate the lepton flavor signatures with tau lepton at LHC upgrades, i.e. HL-LHC, HE-LHC and FCC-hh, through leptonic processes from doubly charged Higgs in the Type II Seesaw. We find that for the channel with one tau lepton in final states, the accessible doubly charged Higgs mass at HL-LHC can reach 655 GeV and 695 GeV for the neutrino mas…
Improved Bounds on the Electromagnetic Dipole Moments of the Tau Lepton
使用电弱数据和有效的拉格朗日方法，我们得到严格的界限上的τ异常磁矩，$-0.004 \leq a_τ\leq 0.006$，并在其电偶极矩，$|d_τ| \leq 1.1 \times 10^{-17} e$厘米。这大大改善了我们以前的边界。用同样的方法，我们得到了其他费米子的偶极矩极限。
The tau-lepton plays an important role in the physics program at the Large Hadron Collider (LHC). It offers a probe in searches for New Physics and to measure parameters of the Standard Model. Spin of tau lepton is an interesting phenomenological quantity for separation of signal from background or in measuring properties of particles. A proper treatment of tau spin effects in the Monte Carlo simulations is important for understanding the detector acceptance as well as for the measurements/use of tau polarization and tau spin correlations. The TauSpinner is a tool to modify tau$spin effects in…
Measurements of electroweak couplings of the tau lepton at L3
我们回顾了目前的知识的τ轻子耦合的电弱规范玻色子，W，Z和光子，从完整的L3数据样本在Z质量附近的质心能量。给出了$τ$的有效矢量和轴矢量弱中性耦合、弱带电电流的洛伦兹结构以及电弱规范玻色子与τ的反常耦合的测量结果。
Renormalization group analysis of the tau-lepton decay within QCD
提出了一种计算类空动量区到类时动量区解析延拓下正则修正的方法。详细分析了τ轻子包含半轻子衰变宽度的微扰部分。
We study the feasibility of the Type-X two Higgs doublet model (THDM-X) at collider experiments. In the THDM-X, new Higgs bosons mostly decay into tau leptons in the wide range of the parameter space. Such scalar bosons are less constrained by current experimental data, because of the suppressed quark Yukawa interactions. We discuss a search strategy of the THDM-X with multi-tau lepton final states at International linear collider and Large Hadron Collider. By using the collinear approximation, we show that a four tau lepton signature (e^+e^- -> HA -> 4τ) can be a clean signal.
Determining the Strange Quark Mass in Cabibbo Suppressed Tau Lepton Decays
本文用微扰QCD和算子乘积展开研究了τ轻子的总强子衰变率及其微分分布的某些矩的辐射修正。我们计算了奇异质量中夸克质量的二次修正与衰变率比R_tau的关系，发现它们对τ轻子的Cabibbo抑制衰变模有明显的贡献。利用最近的实验分析结果，我们得到了m_s（1 GeV）= 200 \pm 40_exp \pm 30_th MeV.
Tau Leptons and Top Quarks in a `Non-Local' Baryogenesis at the Electroweak Phase Transition
在一级电弱相变中，只要泡壁存在CP破坏，就可以产生重子非对称性。在这份报告中，我们讨论的轻子和夸克的作用在“非本地”重子生成机制。
We study the four-body tau^+- -> nu_tau l^+- l^+- X^-+ decays where l=e or mu and X=pi, K, rho and K^* mesons. These decay processes violate the total lepton number (|Delta L|=2) and can be induced by the exchange of Majorana neutrinos. We consider an scenario where these decays are dominated by the exchange of only one heavy neutrino which produces an enhancement of the decay amplitude via the resonant mechanism. Searches for these novel decay channels with branching fractions sensitivities of (10^-7) can provide constraints on the parameter space of the Majorana neutrinos which are stronger …
It is shown that the electric dipole moment of the tau lepton several orders of magnitude larger than predicted by the standard model can be generated from mixings in models with vector like mutiplets. The EDM of the tau lepton arises from loops involving the exchange of the W, the charginos, the neutralinos, the sleptons, the mirror leptons, and the mirror sleptons. The EDM of the Dirac tau neutrino is also computed from loops involving the exhange of the W, the charginos, the mirror leptons and mirror sleptons. A numerical analysis is presented and it is shown that the EDMs of the tau lepton…
We calculate the rates for the charged lepton flavour violating (LFV) decays l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, the six three-body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e conversion in nuclei in the Standard Model (SM3) extended by a fourth generation of quarks and leptons (SM4), assuming that neutrinos are Dirac particles. We also calculate branching ratios for K_L -> mu e, K_L -> pi^0 mu e, B_{d,s} -> mu e, B_{d,s} -> tau e and B_{d,s} -> tau mu. We find that the pattern of the LFV branching ratios in the SM4 differs significantly from…
Tau lepton distributions in semileptonic B decays
给出了底夸克半轻子衰变中τ轻子能量和τ +反中微子系统不变质量的双微分分布的α_s阶微扰QCD修正的解析公式。将这些结果与Falk等人计算的非微扰QCD修正相结合，得到了B介子衰变的能量分布，并计算了τ轻子的能量分布的矩。
We first study the hadronic lepton flavor violating tau decays within the littlest Higgs model with T-parity (including one or two pseudoscalars, or a vector resonance). We consider the case where only T-odd particles and partner fermions contribute, and also its extension including Majorana neutrinos coming from an inverse seesaw. In both cases our mean values lie only one order of magnitude below current upper limits, strengthening the case of searching for these decays in the quest for new physics.
Lepton Polarization and Forward-Backward Asymmetries in b -> s tau+ tau-
我们研究了b -> s τ + τ-衰变中两个τ轻子的自旋极化。除了涉及一个单一的tau的偏振不对称性，我们构造的情况下，同时测量两个偏振的不对称性。我们还研究了与极化tau的前后向不对称。我们发现，大量的不对称性预测是大的，>~ 10%。这使得所有的威尔逊系数和b夸克质量的测量，从而允许标准模型（SM）进行详尽的测试。此外，有许多独特的信号表明新物理学的存在。例如，涉及三重积相关性的不对称性被预测为在SM，O（10^{-2}）内是微小的。他们的观察将是新物理学的一个明确信号。
Discovery of the Higgs boson in any decay channel depends on the existence of event variables or cuts with sensitivity to the presence of the Higgs. We demonstrate the non-optimality of the kinematic variables which are currently expected to play the largest role in the discovery (or exclusion) of the Higgs at the LHC in the tau channel. Any LHC collaboration looking for opportunities to gain advantages over its rivals should, perhaps, consider the alternative strategy we propose.
The tau lepton anomalous magnetic moment
我们回顾标准模型预测的τ轻子g-2提出更新的QED和电弱的贡献，以及最近确定的领先阶强子项，基于低能量的e+e-数据，和强子光的光。
Precision Study of Minimal Supersymmetric Standard Model by production and decay of scalar tau lepton
在未来的$\epem$对撞机上研究标量τ轻子（$\st$）的产生和衰变，通过测量$\st$衰变产生的$τ$轻子的极化，有助于确定$\tanβ$的值。给出了MSSM参数空间的关键图。(talk在2月16日至17日在川崎举行的第五届日本线性对撞机（JLC）研讨会上发表。
Tau Lepton Physics: Theory Overview
τ衰变的纯轻子或半轻子性质使它们成为测试弱流结构及其与规范玻色子耦合的普适性的良好实验室。强子τ衰变模构成了研究非常干净条件下强相互作用的低能效应的理想工具;一个著名的例子是从τ衰变数据精确确定QCD耦合。新的物理现象，如非零的τ中微子质量或违反（味道/ CP）守恒定律也可以用τ衰变来寻找。
Lepton polarization asymmetry and forward backward asymmetry in exclusive B->K_1 tau^(+)tau^(-) decay in universal extra dimension scenario
在标准模型和普适额外维（UED）模型中计算了B-> K_{1} tau ^{+}tau ^{-}（其中K_{1}为轴矢量介子）中末态轻子的衰变率、前后不对称性和偏振不对称性.研究了观测量对UED模型唯一未知参数紧化半径$R$的敏感性。最后，计算了末态K_{1}的螺旋度分数，并讨论了它们与紧化半径的关系。本文将螺旋度分数的分析简单地推广到B->K^{*}l ^{+}l ^{-}（l =e，μ），并与文献中的其他方法进行了比较
Tau lepton Michel parameters and new physics
米歇尔参数的限制和他们的解释的模糊性的一个完整的讨论。估计新的物理，优化了一个非常广泛的类的假设和模型，提出。
The doubly-charged scalar boson H^{--} is involved in several new physics models for generating neutrino masses. Depending on new physics models, H^{--} has the Yukawa interaction with a pair of left-handed charged leptons or a pair of right-handed ones. In this talk, we see that these two Yukawa interactions can be distinguished by measuring energy distributions of charged pions produced by decays of tau leptons if pair-produced H^{++} H^{--} can decay sufficiently into four charged leptons which involve one or two tau leptons. The information on the Yukawa interaction of H^{--} will help to …
In this work we study the consistency of a possible non-vanishing coupling $Hμτ$ of the order of $3.6\times 10^{-3}$ as pointed recently by the CMS and ATLAS collaborations, with measured lepton flavor violation processes involving quarkonium. We show that the most promising channel to confirm this excess is to look for the lepton flavor tau decay into a $f_0$ and $μ$ where the experimental limit could strongly improved with the new B factories as Belle II.
Polarization of tau leptons in semileptonic B decays
在考虑τ偏振的情况下，给出了半轻子b衰变微分宽度的单圈阶QCD修正的解析公式。因此，τ的极化可以用它的能量和τ +反中微子系统的不变质量来表示。计算中加入了Falk等人的非微扰修正。
The importance of tau leptons for supersymmetry searches at the Tevatron
在Tevatron中，通过弱高吉诺的产生和衰变，可能最有效地探索了超对称性。大多数对弱的高吉诺观测量的分析都需要末态的电子或μ子。然而，高金诺可能会主要衰变为τ轻子，从而使超对称性的研究变得复杂。高τ多重数末态的动机在超对称模型的三种建立方法中讨论：最小超引力、规范介导的超对称破缺和更小的超对称。引入了"e/mu/tau候选“的概念，并定义了一个具有三个e/mu/tau候选的可观测量，类似于三轻子可观测量。然后估计了当高吉诺衰变到τ轻子具有全分支分数时超对称性的最大质量范围。
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