Photonic SUSY two-loop corrections to the muon magnetic moment are contributions from diagrams where an additional photon loop is attached to a SUSY one-loop diagram. These photonic corrections are evaluated exactly, extending a leading-log calculation by Degrassi and Giudice. Compact analytical expressions are provided and the numerical behaviour is discussed. The photonic corrections reduce the SUSY one-loop result by 7...9%. The new terms are typically around ten times smaller than the leading logarithms, but they can be larger and have either sign in cases with large SUSY mass splittings. We also provide details on renormalization and regularization and on how to incorporate the photonic corrections into a full SUSY two-loop calculation.
The new FNAL result of the muon $g-2$, combined with the BNL result, shows a 4.2$σ$ deviation from the SM. We use the new data of the muon $g-2$ to revisit several GUT-scale constrained SUSY models with the constraints from the LHC searches, the dark matter detection, the flavor data and the electroweak vacuum stability. We first demonstrate the tension between the muon $g-2$ and other experimental measurements in the CMSSM/mSUGRA. Then after discussing the possible ways to alleviate such a tension and showing the muon $g-2$ in pMSSM under relevant experimental constraints, we survey several e…
Bottom-Tau Unification in SUSY SU(5) GUT and Constraints from b to s gamma and Muon g-2
在最小超引力框架下，分析了超对称SU（5）大统一理论中的底τ汤川统一，其中参数空间受到Br（b to s gamma）和μ介子g-2等实验约束的限制.如果超粒子质量相对较重且希格西诺质量参数μ为负，则底τ统一可以适应于所测得的分支比Br（b对s γ）。另一方面，如果我们采用最新的μ子g-2数据，要求正的超对称贡献，那么在超对称尺度上的错误符号阈值校正会以超过20%的差异打乱汤川统一。它必须通过围绕大统一理论尺度的超重阈值校正来补偿，这限制了超对称大统一理论中的风味模型。一种模式的超粒子质量的三个要求的首选也进行了评论。
We investigate a possibility to explain the discrepancy between the Standard Model predictions and the observed value of the anomalous magnetic moment of the muon within unorthodox SUSY scenarios in which neutralinos are unstable. We start by reviewing the muon g-2 calculations in the MSSM and confront it with the most up-to-date experimental constraints. We find out that the next generation of direct detection DM experiments combined with the current LHC results will ultimately test the parameter region that can explain the $(g-2)_μ$ anomaly in the MSSM. Next, we study R-parity violating and …
Muon anomalous magnetic moment from effective supersymmetry
本文详细分析了在R宇称守恒的有效超对称模型中μ子（g-2）（= 2 a_mu）的可能最大值。首先，第二族和第三族slepton之间的混合可以在一个循环水平上同时对a_mu（SUSY）和τ-> mu γ做出贡献。我们发现，对于任何tan β，a_mu（SUSY）都可以大到（10-20）*10^-10，这给τ-> mu γ分支比设定了上限。此外，如果光阑很轻，μ和A_t足够大（O（1）TeV），则双环Barr-Zee型对a_mu（超对称性）的贡献对于较大的tan β是显著的。在这种情况下，可以使a_mu（SUSY）达到O（10）*10^-10，而不与τ-> l γ冲突。我们得出结论，对于任何tan β，a_mu（SUSY）的可能最大值约为20*10^-10。因此，只有当测量偏差大于\sim 30*10^-10时，μ子a_mu的BNL实验才能排除有效的超对称模型。
A non-universal $U(1)_{X}$ extension to the Standard Model composed of two scalar doublets and two scalar singlets together with three additional quark singlets and two lepton singlets and three generations of right-handed and Majorana neutrinos is made to explain lepton mass hierarchy, neutrino masses via inverse seesaw mechanism and muon anomalous magnetic moment in an anomaly free framework. In the present model, exotic and Standard Model particles acquire mass thanks to vacuum expectation values at different scales, yet the electron and the lightest neutrino are tree level massless but mas…
Muon anomalous magnetic moment, lepton flavor violation, and flavor changing neutral current processes in SUSY GUT with right-handed neutrino
受大气和太阳中微子异常的大混合角解的启发，在SU（5）超对称大统一理论框架下分析了中微子味变中性流过程和轻子味破坏过程以及μ子反常磁矩.为了解释夸克和轻子的真实质量关系，我们考虑了GUT尺度以上的高维算子的影响。结果表明，超对称（SUSY）效应对$K^0-\bar{K}^0$混合CP破坏参数、$ε_K$、$μ\to e γ$分支比和μ子反常磁矩的贡献在很宽的参数空间范围内变大.我们还研究了这些量之间的相关性。在目前的实验范围内的$\text{B}(μ\to e γ)$，大超对称性的贡献是可能的，无论是在μ子异常磁矩或在$ε_K$。在前一种情况下，最近在BNL E821实验上测量的μ子异常磁矩的有利值可以被容纳。在后一种情况下，Kobayashi-Maskawa相的允许区域可能与标准模型（SM）中的预测不同，因此$B\to J/ψK_S$模式和$Δm_{B_s}$模式的CP不对称性的测量可以将这种情况与SM区分开来。当中微子参数与Mikheyev-Smirnov-Wolfenstein小混合角解一致时，$τ\to μγ$分支比可以接近当前实验上界，并且混合诱导的辐射B衰变CP不对称性可以增强.
Motivated by the recent supersymmetry (SUSY) search results which prefer most SUSY particles heavy, and muon g-2 anomaly which prefers colorless SUSY particles light, we explore the status of a light smuon (the SUSY partner of left-handed muon lepton) in the Next-to-Minimal Supersymmetric Standard Model (NMSSM). Assuming colored SUSY particles be heavy, and considering numerous experimental constraints including muon g-2, SUSY searches, and dark matter, we scan the parameter space in the NMSSM with Z3-symmetry, checking the status of colorless SUSY particles and their possible mass order, and …
We discuss gauge mediated supersymmetry breaking models which explain the observed muon anomalous magnetic moment and the Higgs boson mass simultaneously. The successful explanation requires the messenger sector which violates the relation motivated by the grand unification theory (GUT). The naive violation of the GUT relation, however, ends up with the CP problem. We propose a model in which the phases of the gaugino masses are aligned despite the violation of the GUT relation. We also consider a model which generates the $μ$-term and the additional Higgs soft masses squared without causing C…
The recently published result from the Fermilab "MUON G-2" experiment has confirmed the persistent 3-4 $σ$ discrepancy between the experimental result from BNL for the anomalous magnetic moment of the muon, $(g-2)_μ$ , and its Standard Model (SM) prediction. The combination of the two measurements yields a deviation of 4.2 $σ$ from the SM value. Here, we review the parameter space of the electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM), that can accommodate the anomaly while being in full agreement with other experimental data, particularly the direct searches for EW…
We study the constraints of the CP violation in the muon $g-2$ preferred region of the minimal supersymmetric standard model assuming a universal slepton masses within first two generations. We present two particular scenarios where the $g-2$ anomaly is predicted within 2 $σ$ level mainly through the chargino loop or the bino loop. We found that for both cases the electron EDM experiment already highly constrained the CP phase of the parameters: either the Arg[$μM_1]$ or Arg[$μM_2]$ should be smaller than $\mathcal O$(2-3)$\times10^{-5}$. If the muon $g-2$ anomaly is explained by the MSSM, a p…
The new CDF II measurement of $W$-boson mass shows a 7$σ$ deviation from the Standard Model (SM) prediction, while the recent FNAL measurement of the muon $g-2$ shows a 4.2$σ$ deviation (combined with the BNL result) from the SM. Both of them strongly indicate new physics beyond the SM. In this work we study the implication of both measurements on low energy supersymmetry. With an extensive exploration of the parameter space of the minimal supersymmetric standard model (MSSM), we find that in the parameter space allowed by current experimental constraints from colliders and dark matter detecti…
We consider supersymmetric (SUSY) models for the muon $g-2$ anomaly without flavor violating masses at the tree-level. The models can avoid LHC constraints and the vacuum stability constraint in the stau-Higgs potential. Although large flavor violating processes are not induced within the framework of minimal SUSY standard model, once we adopt a seesaw model, sizable lepton flavor violating (LFV) processes such as $μ\to e γ$ and $μ\to e$ conversion are induced. These LFV processes will be observed at future experiments such as MEG-II, COMET and Mu2e if right-handed neutrinos are heavier than $…
Higgs mass and muon anomalous magnetic moment in the U(1) extended MSSM
我们研究了具有额外U（1）规范对称性的MSSM的唯象问题。我们发现，最轻的希格斯玻色子玻色子的质量可以增加到125 GeV，而不引入一个大的超对称尺度或大的A项，在CMSSM和规范介导的超对称破缺（GMSB）模型的框架。这一方案可以同时解释U（1）-扩展的CMSSM/GMSB模型中μ子异常磁矩（μ on g-2）在1 σ水平上的差异。在CMSSM的情况下，暗物质丰度也可以解释。
The prediction for the quartic coupling of the SM-like Higgs boson constrains the parameter space of SUSY models, even in scenarios where all of the new-particle masses are above the scale probed so far by the LHC. We study the implications of the Higgs-mass prediction on a recently-proposed SUSY model that features two pairs of Higgs doublets, and provides a solution to the g-2 anomaly thanks to a suitable enhancement of the muon Yukawa coupling.
We derive an upper bound on the smuon mass assuming that the muon $g-2$ anomaly is explained by the supersymmetric (SUSY) contribution. In the minimal SUSY standard model, the SUSY contribution to the muon $g-2$ is enhanced when the Higgsino mass parameter is large. Then, the smuon-smuon-Higgs trilinear coupling is enhanced, which may destabilize the electroweak vacuum. We calculate precisely the decay rate of the electroweak vacuum in such a case. We include one-loop effects which are crucial to determine the overall normalization of the decay rate. Requiring that the theoretical prediction o…
There is more than 3 sigma deviation between the experimental and theoretical results of the muon g-2. This suggests that some of the SUSY particles have a mass of order 100 GeV. We study searches for those particles at the LHC with particular attention to the muon g-2. In particular, the recent results on the searches for the non-colored SUSY particles are investigated in the parameter region where the muon g-2 is explained. The analysis is independent of details of the SUSY models. Future prospects of the collider searches are also discussed.
Higgs Mass and Muon $g-2$ Anomaly in MSSM with Gauge-Gravity hybrid Mediation
一般来说，我们可以在超对称标准模型（SSM）中提出混合超对称破缺和混合介导。本文研究了超对称性破缺的杂化中介作用。特别地，我们研究了如何保持重力中介、规范中介和异常中介的良好性质，同时解决它们的问题。作为一个例子，我们考虑反常-引力调解，其中所有的超对称粒子（sparticle）从传统的引力调解中获得超对称破缺软项，而规范调解由于分裂的信使而对有色扇区中的软项做出了主导贡献。因此，我们可以自然地实现电弱超对称性，其中slepton，sneutrinos和电弱inos在一个TeV内是轻的，而squarks和gluino在几个TeV左右是重的。这样我们就可以解释125 GeV的Higgs质量，满足LHC的超对称性搜索范围，并解释μ子的反常磁矩等。此外，胶子和方子也远远超出了目前LHC Run II的搜索范围。
Once all the sleptons as well as the Bino are observed at the ILC, the Bino contribution to the muon anomalous magnetic dipole moment (muon $g-2$) in supersymmetric (SUSY) models can be reconstructed. Motivated by the recently confirmed muon $g-2$ anomaly, we examine the reconstruction accuracy at the ILC with $\sqrt{s}$ = 500 GeV. For this purpose, measurements of stau parameters are important. We quantitatively study the determination of the mass and mixing parameters of the staus at the ILC. Furthermore, we discuss the implication of the stau study to the reconstruction of the SUSY contribu…
The SUSY contributions $Δa_μ$ to muon $g-2$ anomaly can not even reach $3σ$ in ordinary gauge mediated SUSY breaking (GMSB) scenarios because of the strong correlations between the colored sparticle masses and the uncolored EW sparticle masses. An interesting extension to GMSB is the (Extra)Ordinary Gauge Mediation (EOGM), which can relax the correlations between squarks and sleptons with non-universal choices for $N_{eff,3}$ and $N_{eff,2}$. We find that EOGM scenarios with $N_{eff,3}\ll N_{eff,2}$ can explain the muon $g-2$ anomaly within $3σ$ range, however can not explain the new W-boson m…
