The consecutive steps of cascade decay initiated by H to tau tau can be useful for the measurement of Higgs couplings and in particular of the Higgs boson parity. In the previous papers we have found, that multi-dimensional signatures of the tau^pm to pi^pm pi^0 nu and tau^pm to 3pi^pm nu decays can be used to distinguish between scalar and pseudoscalar Higgs state. The Machine Learning techniques (ML) of binary classification, offered break-through opportunities to manage such complex multidimensional signatures.
The classification between two possible CP states: scalar and pseudoscalar, is now extended to the measurement of the hypothetical mixing angle of Higgs boson parity states. The functional dependence of H to tau tau matrix element on the mixing angle is predicted by theory. The potential to determine preferred mixing angle of the Higgs boson events sample including $τ$-decays is studied using Deep Neural Network. The problem is adressed as classification or regression with the aim to determine the per-event: a) probability distribution (spin weight) of the mixing angle; b) parameters of the functional form of the spin weight; c) the most preferred mixing angle.
Performance of methods are evaluated and compared. Numerical results are collected.
The H to tau tau decays form the prime channel for the measurement of the Higgs boson state and tests of the CP invariance of Higgs boson couplings. A previous study has shown the viability of deep learning techniques for the measurement. In this paper, the study is expanded. Effects due to the partial modelling of experimental effects are discussed. Furthermore, systematics due to ? decay modelling for complex cascade decays to tau^pm to a_1^pm nu_tau to rho^0 pi^pm nu_tau to 3pi^\pm nu_tau are also addressed. Various parameterisations are considered using low-energy collision data.
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…
Measuring tau-polarisation in Neutralino2 decays at the LHC
我们展示了如何在LHC上测量具有保守R宇称的最小超对称性的衰变链chi 20-> stau 1 tau -> tau tau chi 10中的两个平均tau偏振之和。这是通过利用可见的di-tau质谱的偏振依赖性来实现的。这样的测量提供了有关所涉及的超对称性粒子的耦合的信息，并允许更精确地确定di-tau质量终点。如果可以区分不同的τ衰变模式，则可以进一步改进偏振和终点测量。
The method to determine the CP nature of Higgs bosons from decays to tau leptons at LC
我们演示了如何横向τ-τ自旋关联可以用来确定是否衰变的希格斯玻色子是一个混合CP本征态，从而直接探测CP破坏的中性希格斯玻色子玻色子部门的存在。我们研究了随后的衰变链H --> tau+ tau-> rho+ nu rho- nu --> pi+ pi 0 nu pi-pi 0 nu。在质量为120 GeV的标准模型希格斯玻色子与H-tau-tau耦合的赝标混合物的测量前景，在350 GeV的质心能量和1 ab^{-1}积分亮度的e+e碰撞的情况下进行了量化。标准模型的Higgsstrahlung生产过程被用作一个例子。
Charged-Higgs effects in a new B -> D tau nu differential decay distribution
我们表明，衰变模式B -> D τ nu是竞争和互补的B -> τ nu在寻找带电希格斯效应。更新相关的形状因子，我们发现衰变链B -> D nu tau[-> pi nu]中的微分分布很好地区分了标准模型和带电希格斯粒子的贡献。通过测量D和π能量以及D和π三动量之间的夹角，可以确定有效的荷电-希格斯耦合，包括可能的CP破坏相。
Lepton-flavor violating decays of neutral Higgs to muon and tauon in supersymmetric economical 3-3-1 model
在超对称经济3 - 3 - 1（SUSYE331）模型中研究了Higgs粒子到μ子-τ子的轻子味破坏（LFV）衰变.在sleptons {mu，tau}中存在风味混合和大的v/v '值时，Br（H--> tau ^+ mu ^-）/Br（H--> tau ^+ tau ^-）的比率可以达到不可忽略的值O（10 ^{-3}），如在许多已知的SUSY模型中那样。我们预测，对于标准模型的希格斯玻色子，大型强子对撞机可能会检测到它衰变为μ子和τ子。我们还研究了左右LFV修正值之间的不对称性，证明了LFV效应主要由左FLV项控制，在小的数值极限下，左FLV项比右LFV项大O（10^3）倍。|μ_ρ|/m_SUSY。Higgs介导的影响的衰变τ-->亩的贡献进行了讨论。
In this paper the production cross section $pp\rightarrow (γ, Z) \to ν_τ\bar ν_τγ+X$ in $pp$ collisions at $\sqrt{s}=8, 13, 14, 33TeV$ is presented. Furthermore, we estimate bounds at the $95\%C. L.$ on the dipole moments of the tau-neutrino using integrated luminosity of ${\cal L}=20, 50, 100, 200, 500, 1000, 3000 fb^{-1}$ collected with the ATLAS detector at the LHC and we consider systematic uncertainties of $δ_{sys}=0, 5, 10\%$. It is shown that the process under consideration is a good prospect for probing the dipole moments of the tau-neutrino at the LHC.
In this study, we investigate the potential of the process $pp\rightarrow pγ^{*} p\rightarrow p τ\barν_τq^{\prime} X$ at the LHC to examine the anomalous electromagnetic moments of the tau lepton. We obtain $95\%$ confidence level bounds on the anomalous coupling parameters with various values of the integrated luminosity and center-of-mass energy. The improved bounds have been obtained on the anomalous coupling parameters of electric and magnetic moments of the tau lepton $a_τ$ and $\vert$$d_τ$$\vert$ compared to the current experimental sensitivity bounds. The $γp$ mode of photon reactions a…
Sensitivity to the Higgs Sector of SUSY-Seesaw Models in the Lepton Flavour Violating tau-->mu f0(980) decay
本文研究了超对称-跷跷板模型下的轻子味破坏半轻子τ-> mu f0（980）衰变，其中MSSM谱被三个右手中微子及其超对称伴子扩展，并利用跷跷板机制产生中微子质量。我们估计了它通过希格斯介导通道tau--> mu H *--> mu f0（980）时的衰变率，其中H指CP偶MSSM希格斯玻色子玻色子h^0和H^0，轻子味破坏tau mu H顶点通过超对称环辐射产生。为了描述f0（980）介子，我们遵循手征约束的指导方针。作为我们的计算的一个含义，我们探讨了希格斯部门在这种衰变的敏感性，并将其与其他LFV τ衰变通道。我们对BR（tau--> mu f0（980））的预测与其目前非常具有竞争力的实验界的对抗，使我们提取了一些有趣的限制最相关的模型参数，特别是，tanbeta和m_{H^0}。
我们研究了TeV尺度的新物理（NP）对希格斯玻色子玻色子衰变为带电轻子的速率的可能影响，重点研究了在大型强子对撞机上容易研究的τ-τ通道.利用在NP标度λ以下有效的SU（3）_C X SU（2）_L X U（1）_Y不变有效理论，我们确定了所有能对衰变率产生明显贡献的直到6维的有效算符，并计算了衰变率对相应算符系数的依赖性。我们绑定的规模的基础上的tau质量，自然的考虑，和实验的限制，tau异常磁矩这些运营商系数的大小。这些考虑意味着，从NP标度的Lambda ~ TeV的衰变率的贡献可以与SM汤川相互作用的基础上的预测。只有在理解了这种NP效应并将其置于理论控制之下之后，才有可能对希格斯机制通过h-> tau-tau通道产生费米子质量进行可靠的测试。
