Xiao-Fang Han
In the framework of the littlest Higgs model with T-parity (LHT), we study the contributions of the T-even and T-odd particles to the branching ratio R_b. We find that the precision data of R_b can give strong constraints on the masses of T-odd fermions.
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In the littlest Higgs model with T-parity, we studied the contributions of the new particles to the top-quark pair production via $e^{+}e^{-}$ collision at the International Linear Collider. We calculated the top-quark pair production cross section and found this process can generate significantly relative correction. The result may be a sensitive probe of the littlest Higgs model with T-parity.
Ultraviolet divergences of flavor changing amplitudes in the littlest Higgs model with T-parity
研究了T宇称下最小Higgs模型中的味变中性流过程。结果发现，在Z玻色子变味过程中的对数发散的早期报道，正是由重费米子和Z玻色子的额外的相互作用项的贡献取消。讨论了唯象效应对K -> pi nu nu_bar过程的影响。
Higgs boson decays in the littlest Higss model
在最小Higgs模型的框架下计算了两体希格斯玻色子玻色子的衰变。衰变$H \to γZ$计算在一个循环的水平，并使用以前的结果，我们评估的分支分数的框架中的最小希格斯模型。广泛的空间参数的模型被认为是和可能的偏离标准模型进行了探讨。
Phenomenology of the Littlest Higgs model
小希格斯的想法是一种新的方法来解决小层次问题，通过保护希格斯质量免受二次发散的单圈修正。在这个演讲中，我描述了小希格斯理论的一个特殊实现的现象学：“最小希格斯”模型。
Lepton Flavour Violating Decays in the Littlest Higgs Model with T-Parity
本文给出了T宇称最小希格斯模型（LHT）中轻子味破坏衰变的广泛分析结果。由于在标准模型中，轻子味破坏被小中微子质量高度抑制，因此LHT效应自然是巨大的，并且可以在不久的将来的实验中看到。
Distinguishing the Littlest Higgs model with T-parity from supersymmetry at the LHC using trileptons
我们分析了在大型强子对撞机上T-宇称守恒的最小希格斯模型和R-宇称守恒的超对称性中强子安静的三轻子签名。我们确定的参数空间的区域，这些信号可以揭示这些新的物理模型以上的标准模型背景的存在，并区分它们彼此，即使在一个情况下，当最小希格斯模型的质谱类似于超对称模式。
The correction of the littlest Higgs model to the Higgs production process $e^+e^-\to e^+e^-H$ at the ILC
最小Higgs模型是各种小Higgs模型中最经济的模型。在最小Higgs模型的背景下，我们研究了ILC上的过程$e^{+}e^{-}\to e^{+}e^{-}H$，并计算了最小Higgs模型对该过程截面的修正.结果表明，在电弱精密数据所偏好的有利参数空间内，相对校正值在百分之几到百分之几十之间。在大多数情况下，校正足够大以达到ILC的测量精度。因此，在ILC上可以检测到最小Higgs模型对过程$e^{+}e^{-}\to e^{+}e^{-}H$的修正，这将为检验模型提供一个理想的途径。
The littlest Higgs model with T-parity and single top production at $ep$ collision
在计算T宇称的最小Higgs模型（简称$LHT$模型）对反常顶耦合$tqγ$（$q=u$或$c$）贡献的基础上，考虑了在$ep$碰撞中通过t通道部分子过程$eq\to et$的单顶产生.数值结果表明，相对于标准模型，$LHT$模型的产生截面得到了显著的增强。
Top quark chromomagnetic dipole moment in the littlest Higgs model with T-parity
T宇称的最小Higgs模型（$LHT$模型）预言了重顶夸克、重规范玻色子和镜像费米子等新粒子的存在。我们计算了这些新粒子对顶夸克色磁偶极矩$(CMDM)$ $ΔK$的单圈贡献。我们发现$LHT$模型的贡献比标准模型的预测值小一个数量级。
The production of single and doubly charged Higgs bosons associated with standard model gauge boson $Z_L$ in $e^{+}e^{-}$ colliders are examined. The sensitivity of these processes on the littlest Higgs model parameters in the range of compatibility with electroweak precision observables are analyzed. The possibility of detecting lepton flavor violation processes are also discussed.
Motivated by the search for flavor-changing neutral current (FCNC) top quark decays at the LHC, we calculate rare Higgs three body decay $H\rightarrow Wbc$ induced by top-Higgs FCNC coupling in the littlest Higgs model with T-parity(LHT). We find that the branching ratios of $H\rightarrow Wbc$ in the LHT model can reach $\mathcal O(10^{-7})$ in the allowed parameter space.
Consequences of T-parity breaking in the Littlest Higgs model
本文研究了最小Higgs模型中T宇称破坏反常Wess-Zumino-Witten项的影响。除了树水平的过程中，环引起的衰变的重镜粒子到轻标准模型费米子导致一个新的和丰富的现象，特别是在突破尺度f低于1 TeV。计算了各种过程，并讨论了它们在当前和未来对撞机上的特征。作为副产品，我们发现了希格斯玻色子的另一种产生机制。
We study the top-quark pair production via polarized and unpolarized photon collisions at the International Linear Collider in the context of the littlest Higgs model with T-parity. We calculate the production cross section of the process $γγ\rightarrow t\bar{t}$ and find the effects can be more significant in the $- -$ polarized photon collision mode than in other collision modes, and the relative correction can be expected to reach about -1% in the favorable parameter space.
The Littlest Higgs Model with T parity (LHT) is an interesting alternative model for New Physics at the TeV scale. Although Flavour Physics was not the reason for creating the LHT model, significant effects (such as large CP violation where not predicted by the SM) can be created without violating existing experimental bounds. We study the B-, K- and especially the D-sector.
Measurements of the model parameter in the littlest Higgs model with T-parity
在T宇称的最小Higgs模型中，我们研究了新规范玻色子在国际直线对撞机（ILC）上的产生过程。通过蒙特卡罗模拟的生产过程中，我们表明，重规范玻色子质量可以非常准确地确定在ILC的模型的一个代表性的参数点。根据仿真结果，我们还讨论了在迭代学习控制下其他模型参数的确定。
Phenomenology of the Littlest Higgs with T-Parity
小希格斯模型提供了一个有趣的方法，弱耦合电弱对称性破缺没有微调。最初的小希格斯模型受到来自电弱精确数据的强约束的困扰，需要重新进行微调。这个问题的一个经济的解决方案是引入一个离散的对称性（类似于超对称性的R-宇称）称为T-宇称。T宇称不仅消除了电弱精确数据的大多数限制，而且还导致了一个有希望的暗物质候选者。本文研究了T宇称最小Higgs模型中的暗物质候选者。我们发现边界上的对称性破缺尺度f作为希格斯质量的函数计算的遗物密度。我们从T宇称的最小Higgs模型的LHC现象学开始研究。我们发现，该模型提供了一个有趣的对撞机签名，有一个通用的丢失的能量信号，可以“假”超对称在大型强子对撞机。我们还研究了所有最小希格斯模型所共有的顶夸克的重伙伴的性质，以及它的性质如何随着T宇称的引入而改变。我们在附录中列出了一系列费曼规则，这些规则专门针对具有T宇称的最小希格斯粒子，以便于进一步研究。
$b\to s γ$ in Littlest Higgs Model
研究了最小Higgs模型中的包含过程$b \to s γ$.新粒子产生的贡献通常被$O(v^2/f^2)$的因子抑制。由于实验测量和理论预测的不确定性很大，模型参数可以摆脱目前实验提供的$f \ge 1$ TeV的约束。
In this work, we investigate the one-loop QCD correction to top pair production in the littlest Higgs model with T-parity at the LHC. We calculate the relative correction of the top pair production cross section and top-antitop spin correlation at the LHC for $\sqrt{s}=8,14$ TeV. We find that the relative corrections of top pair production cross section can reach about $-0.35\%$, and the top-antitop spin correlation can reach $1.7\%$($2\%$) at the 8(14) TeV LHC in the favorable parameter space.
Signals of the littlest Higgs model with T-parity at $eγ$ and $ep$ collisions
T宇称的最小希格斯模型预言了中性、弱相互作用的新规范玻色子$B_{H}$的存在，它可以被看作是一个有吸引力的暗物质候选者。我们研究了新规范玻色子$B_{H}$通过$eγ$和$ep$碰撞的产生。我们发现$B_{H}$可以通过子过程$e^{-}γ\to L^{-}B_{H}$和$γq\to B_{H}Q$大量产生，这可能会产生特征信号。文中还对这类信号的$SM$背景进行了讨论。
In the littlest Higgs model with T-parity (LHT), we study the $t$-channel single top production in association with a Higgs boson at 8 and 14 TeV LHC. We find that the cross section can be enhanced obviously in this model compared to the Standard Model. By performing a simple parton-level simulation through $pp\rightarrow t(\rightarrow \ell^{+}νb)h(\rightarrow b\bar{b})j$ at 14 TeV LHC, we find that the observability of the signal is promising in the favorable parameter space.
A vector-like heavy quark in the Littlest Higgs model
Littlest Higgs模型包含了一个新的矢量状重夸克。它的存在有两个有趣的特点。一个是它将标准模型中的$3\times3$ CKM矩阵扩展为$4\times3$矩阵，另一个是它允许Z介导的风味改变中性电流在上扇区而不是下扇区中的树水平。我们研究了几个可能的窗口，其中Z介导的味道改变中性电流的最小希格斯模型可以进行测试。
In the littlest Higgs model with T-parity (LHT), the mirror quarks have flavor structures and will contribute to the top quark flavor changing neutral current. In this work, we perform an extensive investigation of the top quark rare three-body decays $t\to cVV (V=γ,Z,g)$ and $t\to cf\bar{f} (f=b,τ,μ,e)$ at one-loop level. Our results show that the branching ratios of $t\to cgg$ and $t\to cb\bar{b}$ could reach $\mathcal {O}(10^{-3})$ in the favorite parameter space of the littlest Higgs model with T-parity, which implies that these decays may be detectable at the LHC or ILC, while for the oth…
In the littlest Higgs model with T-parity, we study associated production of a Higgs and a single top quark at the 14 TeV LHC. We focus on the Higgs to two photons decay and the semileptonic top decay channel. By performing a fast detector simulation, we find that the $thj$ search in the selected channel can excluded the top partner mass $m_{T_{+}}$ up to 805 (857) GeV for case A (case B) at $2σ$ confidence level at 14 TeV LHC with the integrated luminosity $L= 3 \rm ab^{-1}$.
Test of the Littlest Higgs model through the correlation among W boson, top quark and Higgs masses
受最近对W玻色子质量和顶夸克质量的精确测量的启发，我们通过将M_W和M_t的当前和未来测量值与M_W和M_t的预测值进行对比，并通过M_W、M_t和Higgs质量之间的相关性来检验Littlest Higgs模型。我们认为，尽管最近的电弱测量数据可能与标准模型的预测一致，但当前的测量值和测量精度更倾向于支持最小Higgs模型。在这个分析中，整体SU（5）对称性破缺标度的上限被证明是26.3 TeV。我们还讨论了如何从对模型参数的约束中预测LittleHiggs模型中重规范玻色子M_B的质量。
The branching ratio $R_{b}$ in the littlest Higgs model
在最小Higgs（LH）模型下，我们研究了新粒子对分支比$R_{b}$的贡献.我们发现，贡献主要取决于自由参数$f$，$c'$和$x_{L}$。$R_{b}$的精确测量值对这些自由参数给出了严格的约束。
Phenomenology of Mirror Fermions in the Littlest Higgs Model with T-Parity
小希格斯模型是一个有趣的替代解释电弱对称性破缺没有微调。补充一个离散的对称性（T-宇称）的限制，从电弱精密数据自然回避，也获得了一个可行的暗物质的候选人。T宇称意味着除了小希格斯模型的重规范玻色子之外，还存在新的（镜像）费米子。本文研究了镜像费米子对LHC中T宇称最小Higgs模型唯象的影响。我们研究了新粒子最有希望的产生通道和衰变链。我们发现镜像费米子对信号速率的大小和新的物理签名有很大的影响。给出了现实的背景估计。
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.
Littlest Higgs Model and Unitarity Constraints
最小希格斯模型的约束使用树级微扰参数，类似于那些用来获得希格斯质量约束。发现微扰幺正性破坏发生在能量标度$\sim 1.5χf$上，其中$f$是π衰变常数的模拟，它决定了理论中的质量标度和强相互作用标度，而$χ$是一个无量纲参数，它和$f$一起决定了理论中重标量的质量标度.
Impact of Single-Top Measurement to Littlest Higgs Model with T-Parity
我们表明，在Tevatron和LHC的单顶产生截面的精确测量可以强烈约束的T宇称的最小希格斯模型的模型参数。单顶产生率比标准模型预测的要低，这意味着顶夸克的重T宇称伙伴产生了新的物理现象。我们证明了由重T奇伴衰变产生的顶夸克（$T_{-}$）的极化度可以用来确定新的物理能量标度，而$T_{-}$的质量可以由$T_{-}\bar{T}_{-}$事件中丢失的横动量分布来测量.
Production of mirror fermions via $eγ$ and $ep$ collisions in the littlest Higgs model with T-parity
具有T宇称的最小希格斯模型（称为$LHT$模型）的一个重要特征是它引入了镜像费米子，这是标准模型费米子的T宇称伙伴。本文讨论了镜像中微子通过$eγ$和$ep$碰撞产生的镜像夸克。我们发现，在国际$e^{+}e^{-}$直线对撞机$(ILC)$和$ep$对撞机$(THERA)$实验中，在很宽的参数空间范围内都能产生大量的镜夸克.还计算了与镜夸克主要两体衰变模式有关的信号事件的产生率。
In the littlest Higgs model with T-parity, the new interactions between the mirror leptons and the Standard Model leptons can induce some lepton flavor violation (LFV) processes at loop level. We study the possibility of the ILC to probe the LFV production processes $e^+e^-(γγ)\rightarrow l_{i}\bar{l}_{j}$. Our results show that the rates of $γγ\rightarrow l_{i}\bar{l}_{j}$ can reach 1 fb in optimal cases after reasonable kinematical cuts, which implies that these processes may be observed at the ILC.
Simulation study of ZHAH mode in Littlest Higgs Model with T-Parity
本文研究了在sqrt（s）= 500 GeV的ILC上测量T宇称的最小Higgs模型参数的可能性。该模型预测了新的规范玻色子（AH，ZH和WH），其中重光子（AH）是暗物质的候选者。通过对e+ e- -> AH ZH过程的蒙特卡罗模拟，我们表明，用该方法可以确定质量，对m_AH和m_ZH的准确度分别为16.2%和4.3%。此外，真空期望值可以以4.3%的精度确定。
We show that the inverse see-saw is the most natural way of implementing neutrino masses in the Littlest Higgs model with T-parity. The three extra quasi-Dirac neutrinos are needed to cancel the quadratically divergent contributions of the mirror leptons to the Higgs mass. If the T-parity of the heavy neutrino singlets is chosen to be even, their contributions to lepton flavor violating transitions are one-loop finite. The most stringent limits on this scenario result from the non-observation of these transitions. Constraints on neutrino mixing imply an upper bound on the mass of the T-odd mir…
Inspired by the recent CMS $h \to μτ$ excess, we calculate the lepton flavor violating Higgs decay $h \to μτ$ in the littlest Higgs model with T-parity (LHT). Under the constraints of $\ell_i \to \ell_j γ$, $Z \to \ell_i \bar{\ell}_j$ and Higgs data, we find that the branching ratio of $h \to μτ$ can maximally reach $\mathcal O(10^{-4})$. We also investigate the correlation between $h \to μτ$, $τ\to μγ$ and $Z \to μτ$, which can be used to test LHT model at future $e^+e^-$ colliders.
Charged Lepton Flavour Violation in Littlest Higgs model with T-parity
具有T宇称的小希格斯模型（LHT）属于非最小味破坏模型。这个模型在夸克和轻子扇区都有新的味源和CP破坏。这些新的味违反来源于标准模型（SM）费米子与重规范玻色子和重（或镜像）费米子的相互作用。在这项工作中，我们将提出的T-宇称模型的新味结构的影响，味违反轻子部门。
The impossibility of heavy neutrino dark matter in the Littlest Higgs Model with T-parity: constraints from direct search
我们考虑了T宇称的最小希格斯模型（LHT），在参数区域中，重中微子是最轻的T奇粒子（LTP）。在强调了这对应于一个相当大的区域的参数空间的理论，我们表明，无论是低温暗物质搜索（CDMS）和氙10实验不允许整个区域的新粒子的质量在LHT可以躺在几个TeV。因此，对重中微子LTP信号的任何观测都可能重新严肃地讨论宇宙中冷暗物质的问题。
Flavor-Changing Top Quark Rare Decays in the Littlest Higgs Model with T-Parity
本文分析了T宇称下的最小Higgs模型中顶夸克衰变为粲夸克和规范玻色子的罕见的变味衰变。我们计算了T宇称奇镜夸克和规范玻色子的单圈能级贡献。我们发现LHT模型中的衰变$t\to c V, (V=g,γ,Z)$相对于标准模型中的衰变有明显的增强。我们的数值计算结果表明，在LHT模型中，顶夸克的FCNC衰变可以达到$Br(t\to cg)\sim 10^{-2}$，$Br(t\to cZ)\sim 10^{-5}$和$Br(t\to cγ)\sim 10^{-7}$的最佳参数空间.
Mixing and CP-Violation in the Littlest Higgs Model with T-Parity
本文给出了T宇称下最小Higgs模型的味物理分析结果。特别地，我们研究了K^0和B^0_{d，s}系统的混合和CP破坏。考虑了由镜夸克质量值和新味混合矩阵V_Hd参数定义的几种情况。一个非常有趣的方案被确定，其中众所周知的K介子约束得到满足，sin（2 β）和Delta M_s问题相对于标准模型得到改善，并且可以很快在A_SL^s和S_{psi phi}中发现可见的效果。
Leptonic $Z$ decays in the littlest $Higgs$ model with T-parity
最小的T宇称$Higgs$模型（称为$LHT$模型）预言了T奇轻子的存在，它可以在单圈水平上对一些轻子过程产生贡献。我们计算了它们对轻子$Z$衰变过程$Z\to l\bar{l'}$、$Z\to l\bar{l}$和$Z\rightarro ν\barν$的贡献。我们发现T奇轻子在大部分的参数空间中对这些衰变过程的分支比都有显著的贡献。实验测量值可能对$LHT$模型的自由参数产生约束。
Motivated by the first experimental evidence of meson oscillations in the D system, we study D^0 - \bar D^0 mixing in the Littlest Higgs model with T-parity, we investigate its role in constraining the model parameters and its impact on the most interesting flavour observables. We find that the experimental data are potentially strongly constraining but at present limited by large theoretical uncertainties in the long-distance Standard Model contribution to D^0 - \bar D^0 mixing.
The littlest Higgs model and Higgs boson associated production with top quark pair at high energy linear $e^{+}e^{-}$ collider
在电弱精密测量数据允许的参数空间内，考虑了最小Higgs（$LH$）模型预测的新粒子对未来高能线性$e^{+}e^{-}$对撞机（$ILC$）中顶夸克对伴随产生希格斯玻色子玻色子的贡献.我们发现这些贡献主要来自于新的规范玻色子$Z_{H}$和$B_{H}$。对于自由参数的合理值，相对校正参数$δσ/σ^{SM}$的绝对值可以显著地大，这可能在未来的使用$\sqrt{S}=800GeV$的$ILC$实验中观察到。
Effects of the littlest Higgs model with T-parity on Higgs boson production at high energy $e^{+}e^{-}$ colliders
希格斯玻色子的产生过程$e^{+}e^{-}\to ZH$、$e^{+}e^{-}\to \bar{ν_{e}}ν_{e}H$和$e^{+}e^{-}\to t\bar{t}H$对于研究希格斯玻色子的性质和进一步验证高能线性$e^{+}e^{-}$对撞机（$ILC$）中超越标准模型的新物理（$SM$）具有重要意义。我们估计了具有T宇称的最小Higgs模型（$LHT$模型）对这些过程的贡献，发现$LHT$模型可以对这些过程的产生截面产生显著的修正.我们希望在未来的$ILC$实验中，通过这些过程可以检测到$LHT$模型的可能信号。
A Guide to Flavour Changing Neutral Currents in the Littlest Higgs Model with T-Parity
在标准模型（SM）中被强烈抑制的味道变化中性电流过程，为在远高于电弱尺度的尺度上的新物理学提供了一个独特的窗口。本文综述了T宇称下最小Higgs模型在夸克和轻子区的味物理研究的最新进展。特别强调的是各种相关性，可以区分这种模式从其他扩展的SM。
The correction of the littlest Higgs model to the Higgs production process $e^{-}γ\to ν_{e}W^{-}H$ in $e^{-}γ$ collisions
最小Higgs模型是各种小Higgs模型中最经济的模型。在最小Higgs（LH）模型下，研究了过程$e^{-}γ\to ν_{e}W^{-}H$，计算了LH模型对过程截面的贡献.结果表明，在电弱精密数据偏好的大多数参数空间中，相对校正值均大于10%。这种对过程$e^{-}γ\to ν_{e}W^{-}H$的修正是足够大的，可以在未来的高能线性$e^{+}e^{-}$对撞机（$LC$）实验中通过$e^{-}γ$碰撞检测到，其中c.m能量$\sqrt{s}$ =500 GeV，年积分亮度$£=100fb^{-1}$，这将提供一个理想的方式来测试模型。
The littlest Higgs model with T-parity (LHT) has new flavor-changing (FC) couplings with the Standard Model (SM) quarks, which do not suffer strong constraints from electroweak precision data. So these FC interactions may enhance the cross sections of some flavor-changing neutral-current (FCNC) processes. In this work, we study the FC top-charm associated productions via $e^{-}γ$ collision at the ILC. We find that the cross sections are sensitive to the mirror quark masses. With reasonable values of the parameters, the cross sections may reach the detectable level and provide useful informatio…
Precise limits from lepton flavour violating processes on the Littlest Higgs model with T-parity
我们重新计算了最小希格斯模型的T-宇称中的mu > e γ和mu -> γ的主要单圈贡献，恢复了前者的先前结果。当考虑所有的Goldstone相互作用时，后者也是紫外有限的。目前对这些过程的实验限制需要一个有点重的有效尺度~2.5 TeV，或者在~10%水平上轻轻子和重轻子的汤川耦合的味对齐，或者重轻子质量分裂到类似的精度。目前对τ衰变的限制并没有对涉及τ轻子的相应参数设定界限
Higgs boson productions at LHC as a probe of different littlest Higgs models with T-parity
大型强子对撞机产生的希格斯玻色子将作为各种小希格斯模型的灵敏探针。本文比较研究了两种不同T宇称结构的最小Higgs模型在LHC中希格斯玻色子玻色子三个产生过程中的作用，即单个Higgs、Higgs对以及与一对顶夸克和反顶夸克相关联的希格斯玻色子玻色子的产生.这两个模型的特点是预测一个顶级的合作伙伴取消希格斯质量平方发散贡献的顶夸克偶和奇T宇称，分别。我们发现，这两个模型可以改变SM截面sizably和他们的修正也有显着差异。因此，大型强子对撞机上的希格斯玻色子的产生可能会对这两个模型有所启发，甚至可以区分它们。
Higgs boson pair production process $e^+e^-\to ZHH$ in the littlest Higgs model at the ILC
探讨了在未来的线性$e^{+}e^{-}$对撞机上通过$e^{+}e^{-}\to ZHH$过程研究Higgs三重自耦合的物理前景。本文计算了在未来的高能$e^{+}e^{-}$对撞机（$ILC$）中，最小Higgs模型预言的新粒子对这一过程截面的贡献。结果表明，在电弱精度所要求的有利参数空间内，总截面与$SM$值的偏差在百分之几到百分之几十之间，这在未来的$\sqrt{s}$ = 500 GeV的$ILC$实验中可能被探测到.
In this work we calculate the leading electroweak (EW) corrections to the anomalous $gt\bar{t}$ coupling in the Littlest Higgs model with T-parity (LHT), by applying the Goldstone boson equivalence theorem. In the LHT model, such electroweak corrections arise from the loop diagrams of heavy fermions and the ``would-be'' Goldstone bosons. We further examine the EW corrections in the top quark pair production via the quark annihilation process at the LHC. The negative EW corrections in the Standard Model are partially canceled by the positive EW corrections from the loops of the new heavy partic…
Motivated by the recent LHC Higgs data and null results in searches for any new physics, we investigate the Higgs couplings and naturalness in the littlest Higgs model with T-parity. By performing the global fit of the latest Higgs data, electroweak precise observables and $R_{b}$ measurements, we find that the scale $f$ can be excluded up to 600 GeV at $2σ$ confidence level. The expected Higgs coupling measurements at the future collider TLEP will improve this lower limit to above 3 TeV. Besides, the top parnter mass $m_{T_{+}}$ can be excluded up to 880 GeV at $2σ$ confidence level. The futu…
In Little Higgs models a collective symmetry prevents the Higgs from acquiring a quadratically divergent mass at one loop. This collective symmetry is broken by weakly gauged interactions. Terms, like Yukawa couplings, that display collective symmetry in the bare Lagrangian are generically renormalized into a sum of terms that do not respect the collective symmetry except possibly at one renormalization point where the couplings are related so that the symmetry is restored. We study here the one loop renormalization of a prototypical example, the Littlest Higgs Model. Some features of the reno…
We investigate a possibility of precision measurements for parameters of the Littlest Higgs model with T-parity at the International Linear Collider (ILC). The model predicts new gauge bosons which masses strongly depend on the vacuum expectation value that breaks a global symmetry of the model. Through Monte Carlo simulations of production processes of new gauge bosons, we show that these masses can be determined very accurately at the ILC for a representative parameter point of the model. From the simulation result, we also discuss the determination of other model parameters at the ILC.
Determination of Littlest Higgs model parameters at the ILC
我们研究了在高能e+e-碰撞中最小Higgs模型的扩展规范扇区的影响。我们发现，在e+e- -> f fbar在500 GeV的质心能量的国际直线对撞机的搜索范围基本上涵盖了整个参数区域的最小希格斯模型是相关的规范层次问题。此外，我们表明，该通道提供了一个准确的确定的基本模型参数，精度为百分之几，只要大型强子对撞机测量的重中性规范场的质量。此外，我们还证明了在参数空间的一个重要区域，可以从过程e+e- -> Z higgs中观察到额外规范玻色子与轻Higgs的耦合。这使得确认的结构的取消希格斯质量平方发散，并将验证小希格斯机制。
In the littlest Higgs model with T-parity (LHT) the mirror quarks induce the special flavor structures and some new flavor-changing (FC) couplings which could greatly enhance the production rates of the FC processes. We in this paper study some bottom and anti-strange production processes in the LHT model at the International Linear Collider (ILC), i.e., $e^+e^-\rightarrow b\bar{s}$ and $γγ\rightarrow b\bar{s}$. The results show that the production rates of these processes are sizeable for the favorable values of the parameters. Therefore, it is quite possible to test the LHT model or make som…
Littlest Higgs model with T-parity and Minimal Supersymmtric standard Model with R-parity both give similar signatures in collider experiment with a huge amount of missing energy depending upon mass of the lightest T-odd/R-odd particle. In this talk, I will discuss possibility of distinguishing the two models at the LHC in hadronically quiet signal where masses of R-odd particles are identical to masses of T-odd particles.
In this work, we investigate the Higgs-boson production processes $e^{+}e^{-}\rightarrow ZH$, $e^{+}e^{-}\rightarrow ν_{e}\bar{ν_{e}}H$ and $e^{+}e^{-}\rightarrow e^{+}e^{-}H$ in the littlest Higgs model with T-parity. We present the production cross sections, the relative corrections and some distributions of the final states. In the allowed parameter space, we find that the relative corrections of the three production channels are negative, the relative correction of the $ZH$ production can reach $-7.5\%$ and the relative corrections of the $ν_{e}\bar{ν_{e}}H$ and $e^{+}e^{-}H$ production ca…
In this work pair productions of charged and doubly charged scalars in the framework of littlest Higgs model at $e^+e^-$ colliders are studied. In the allowed parameter space of the littlest Higgs model, the production rates of the scalar pairs are calculated. It is obtained that pair productions of charged and doubly charged scalars are reachable at $e^+ e^-$ colliders with energy $\sqrt{S}\geq 1.7TeV$. Using the lepton flavor violating decays of charged scalars calculated in literature, final state analysis is done for pair production processes. This analysis show that depending on the model…
tbW vertex in the Littlest Higgs Model with T-parity
本文研究了具有单圈诱导弱偶极系数f_{2R}的T宇称最小Higgs模型的有效tbW顶点。在tbW ^+耦合下，得到了顶夸克的宽度、t-> bW^+衰变中的W玻色子螺旋度以及LHC上单顶夸克产生的t通道和s通道模。我们的计算是在Feynman-t Hooft规范中进行的，我们提供了分析的细节，比如所有粒子的质量和混合角的精确公式（对于膨胀变量v/f的所有阶）。此外，一个完整的和精确的对角化（和规范化）的标量部门的模型。
Towards the effective potential of the Littlest Higgs model
本文计算了Littlest Higgs（LH）模型中Higgs标量有效势和Higgs标量有效势的有关参数。这些参数作为两种贡献的和而获得。第一个是来自费米子和规范玻色子的单圈辐射修正。第二个是在树的水平上获得的紫外线完成的模型所需的高阶有效的运营商。最后分析了SM集再现标准电弱对称破缺的要求对LH模型参数的限制。
In this work, the production processes of heavy neutral scalar and pseudo scalar associated with standard model gauge boson $Z_L$ at future $e^{+}e^{-}$ colliders (ILC and CLIC) are examined. The total and differential cross sections are calculated for the processes in the context of the littlest Higgs model. Also dependence of production processes to littlest Higgs model parameters in the range of compatibility with electroweak precision measurements and decays to lepton flavor violating final states are analyzed. We have found that both heavy scalar and pseudoscalar will be produced in $e^+e…
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