Quark-flavour violating Higgs decays to charm and bottom pairs in the MSSM
E. Ginina, H. Eberl, A. Bartl, K. Hidaka, W. Majerotto
备注:
Talk given by E. Ginina at the Sixth Workshop on Theory, Phenomenology and Experiment on Flavour Physics, FPCapri2016, 11-13 June 2016 Villa Orlandi, Anacapri, Capri Island, Italy. Version to appear in Nuclear and Particle Physics Proceedings, HEPHY-PUB 979/16, UWThPh2016-16, supported by FWF, project No. P26338-N27
We calculate the decay width of $h^0 \to b \bar{b}$ in the Minimal Supersymmetric Standard Model (MSSM) with quark-flavour violation (QFV) at full one-loop level. The effect of $\tilde{c}-\tilde{t}$ mixing and $\tilde{s}-\tilde{b}$ mixing is studied taking into account the constraints from the B-meson data. We discuss and compare in detail the decays $h^0 \to c \bar{c}$ and $h^0 \to b \bar{b}$ within the framework of the perturbative mass insertion technique using the Flavour Expansion Theorem. The deviation of both decay widths from the Standard Model results can be quite large. While in $h^0 \to c \bar{c}$ it is almost entirely due to the flavour violating part of the MSSM, in $h^0 \to b \bar{b}$ it is mainly due to the flavour conserving part. Nevertheless, $Γ(h^0 \to b \bar{b})$ can fluctuate up to $\sim 7\%$ due to QFV chargino exchange with large $\tilde{c}-\tilde{t}$ mixing. due to QFV chargino exchange with large $\tilde{c}-\tilde{t}$ mixing.
Interplay between Hbs and bsgamma in the MSSM with Non-Minimal Flavour Violation
我们研究了非最小味破坏(NMFV)的MSSM味混合参数对味变化中性重Higgs玻色子衰变H-> b \bar s的约束.在我们的分析中,我们包括SM和新物理的贡献,由于一般的味道混合的squark质量矩阵。我们研究的情况下,一个和两个非零的味道混合参数,并发现在后一种情况下的干扰可以提高希格斯的味道变化的分支比由一个或两个数量级相对于以前的预测基于一个单一的非零参数,并与目前的限制从$B$物理协议。在我们的工作过程中,我们为NMFV MSSM开发了一个新的“FeynArts”模型文件,并为“FormCalc”添加了评估所需的代码。这两个扩展都是公开的。
We calculate the decay width of h0 -> b bbar in the Minimal Supersymmetric Standard Model (MSSM) with quark flavour violation (QFV) at full one-loop level. We study the effect of scharm-stop mixing and sstrange-sbottom mixing taking into account the constraints from the B meson data. We discuss and compare in detail the decays h0 -> c cbar and h0 -> b bbar within the framework of the perturbative mass insertion technique using the Flavour Expansion Theorem. The deviation of both decay widths from the Standard Model values can be quite large. Whereas in h0 -> c cbar it is almost entirely due to…
We present an extensive study of the MSSM parameter space allowing for general generation mixing in the squark sector. Employing an MCMC algorithm, we establish the parameter ranges which are allowed with respect to various experimental and theoretical constraints. Based on this analysis, we propose benchmark scenarios for future studies. Moreover, we discuss aspects of signatures at the LHC.
FCNC and CP Violation Observables in a SU(3)-flavoured MSSM
最小超对称标准模型的非阿贝尔味对称性可以解释汤川耦合的味结构,同时解决超对称味问题。类似地,如果CP在风味区段中自发地被破坏,则超对称CP问题可以被解决。在这项工作中,我们提出了一个明确的例子,这些声明与SU(3)味对称性和自发的CP破坏。此外,我们表明,它仍然是可能的,找到一些重大偏离SM的期望,就FCNC和CP破坏而言。我们发现轻子味破坏衰变如$μ\to e γ$和$τ\to μγ$、电偶极矩$d_e$和$d_n$以及K介子CP破坏过程如$ε_K$都有很大的贡献。因此,这些风味MSSM的实现是现象敏感的风味和CP vioation物理领域的实验研究。
We analyse the sensitivity of quark flavour-changing observables to the MSSM, in a regime of heavy superpartner masses. We analyse four distinct and motivated frameworks characterising the structure of the soft-breaking terms by means of approximate flavour symmetries. We show that a set of six low-energy observables with realistic chances of improvement in the near future, namely $ΔM_{s,d}$, $ε_K$, $ε_K'/ε_K$, $\mathcal{B} (K\to πν\barν)$, and the phase of $D$--$\bar D$ mixing, could play a very important role in charactering these frameworks in a regime of superpartner masses up to $\mathcal…
The forthcoming precision data on lepton flavour violating decays require precise and efficient calculations in New Physics models. In this article lepton flavour violating processes within the Minimal Supersymmetric Standard Model (MSSM) are calculated using the method based on the Flavour Expansion Theorem, a recently developed technique performing a purely algebraic mass-insertion expansion of the amplitudes. The expansion in both flavour-violating and flavour-conserving off-diagonal terms of sfermion and supersymmetric fermion mass matrices is considered. In this way the relevant processes…
Soft supersymmetry-breaking terms provide a wealth of new potential sources of flavour violation, which are tightly constrained by precision experiments. This has posed a challenge to construct flavour models which both explain the structure of the Standard Model Yukawa couplings and also predict soft-breaking patterns that are compatible with these constraints. While such models have been studied in great detail, the impact of flavour violating soft terms on the Higgs mass at the two-loop level has been assumed to be small or negligible. In this letter, we show that large flavour violation in…
Quark-flavour violation in $h^0 \to b \bar{b}$ in the MSSM at one-loop level
我们计算了具有夸克味破坏(QFV)的一般MSSM中次领先级$h^0$(125 GeV)$\to b \bar{b}$的衰变宽度.考虑到B介子数据对QFV的限制,我们研究了第二代和第三代方子之间的混合效应。我们讨论了重正化的过程,以及在大$\tan β$汤川耦合的底部recrimation。我们显示的衰减宽度$Γ(h^0 \to b \bar{b})$作为所涉及的QFV参数的函数的数值结果,并比较它们与相应的宽度在标准模型。
Exploring the flavour structure of the MSSM with rare K decays
在标准模型的最小超对称扩展中,我们对稀有K衰变,特别是两种中微子模式K+->pi+ nu nu bar和KL-> pi 0 nu bar进行了广泛的分析.我们分析了这些模式的分支比的期望,无论是在限制性的框架内的最小的味道违反假设,并在一个更一般的框架内与新的来源的味道对称性破坏。在这两种情况下,可以从两个中微子模式的精确测量中提取的信息在限制模型的参数空间方面是非常有用的,即使在考虑了高能对撞机产生的质谱的可能信息和B物理实验的约束之后。在存在新的味道对称性破缺源的情况下,对模型的附加的显著约束也可以从两个KL-> P10 1 + 1-模式导出。
Using the experimental data on pentaquarks with a hidden charm, new upper limits on the intrinsic charm in the proton are obtained, possible shapes of heavy quark distributions inside the proton are discussed.
我们推导出了对量delta_{XY} ^{ij},X,Y=L,R的新的约束条件,这些约束条件使MSSM中的带电slepton质量矩阵的味非对角项参数化。考虑电子的质量和反常磁矩,我们得到了电子的束缚|delta^{13}_{LL} delta^{13}_{RR}|对于tan β =50,<0.1,这涉及约束较差的元素delta^{13}_{RR}。我们改进了衰变τ-> mu gamma,τ-> e gamma和mu -> e gamma的预测,包括两个回路的校正,如果tan β很大,则会增强。从软超对称性破缺项的PMNS矩阵的有限重整化导出并应用于带电希格斯轻子顶点。我们发现,BR(τ-> e γ)的实验范围严重限制了PMNS元素U_{e3}的MSSM环路校正的大小,这对于正确解释未来的U_{e3}测量是很重要的。随后,我们用大统一理论分析来面对delta^{ij}_{LL}的新值。此外,我们还考虑了5维汤川项的影响,这是修复前两代汤川统一所必需的。如果普遍超对称破缺发生在GUT尺度以上,我们发现5维Yukawa耦合的味结构受到mu -> e γ的严格约束。
We study the loop-induced decays $h^0 \to γ\, γ$ and $h^0 \to g \, g$ in the Minimal Supersymmetric Standard Model (MSSM) with quark flavour violation (QFV), identifying $h^0$ with the Higgs boson with a mass of 125 GeV, where $γ$ and $g$ are photon and gluon, respectively. We perform a MSSM parameter scan and a detailed analysis around a fixed reference point respecting theoretical constraints from vacuum stability conditions and experimental constraints, such as those from B meson data and electroweak precision data, as well as recent limits on supersymmetric (SUSY) particle masses from LHC …
Lepton Flavour Violation in the Constrained MSSM with Natural Neutrino Mass Hierarchy
我们提出的预测$μ\to e γ$和$τ\to μγ$在CMSSM中,有一个自然的中微子质量的层次结构,从顺序的优势,三个右手中微子。我们在$(m_0,M_{1/2})$平面上对这个模型进行了全局分析,假设辐射电弱对称性破缺,并包括所有观测到的实验室数据。我们证实,一个大(小)的$τ\to μγ$率的结果,占主导地位的右手中微子是最重(最轻)的。我们发现,$μ\to e γ$率可以确定的次主导中微子汤川耦合味的基础上,但也可能是敏感的影响超出领先的日志和领先的质量插入近似。我们还表明,$μ\to e γ$率是独立的$θ_{13}$,但这个角度的测量可能会确定一个比率的次主导汤川耦合。
Motivated by tensions between experimental measurements and SM predictions in $b\to s \ell^+\ell^-$ transitions, we present the first study of non-minimal flavour-violating Minimal Supersymmetric Standard Model (MSSM) scenarios contributing to the relevant Wilson coefficients to address the observed anomalies using SuperIso and MARTY. We calculate the full one-loop analytical contributions of the general MSSM to Wilson coefficients relevant for flavour anomalies, together with the anomalous muon magnetic dipole moment $(g-2)_μ$. We show that, after imposing theoretical constraints on the flavo…
We study the two-body decays of the gluino at full one-loop level in the Minimal Supersymmetric Standard Model with quark-flavour violation (QFV) in the squark sector. The renormalization is done in the $\overline{\rm DR}$ scheme. The gluon and photon radiations are included by adding the corresponding three-body decay widths. We discuss the dependence of the gluino decay widths on the QFV parameters. The main dependence stems from the $\tilde c_R - \tilde t_R$ mixing in the decays to up-type squarks, and from the $\tilde s_R - \tilde b_R$ mixing in the decays to down-type squarks due to the s…
Light Stop Decay in the MSSM with Minimal Flavour Violation
在超对称的情况下,光停止粒子$\tilde{t}_1$和最轻的超对称粒子(LSP)的质量差很小,假设是最轻的中性伴子,味道改变中性电流衰变$\tilde{t}_1 \to c \tildeχ_1^0$可以是主要的衰变通道,并可以超过四体停止衰变的某些参数值。在最小风味破坏(MFV)的框架中,这种衰减被CKM抑制,从而诱导长的停止寿命。在大型强子对撞机上的终止衰变长度测量可以用来测试那些通过标准模型汤川耦合的具有最小味道的模型。衰变宽度在一段时间以前已经通过一个近似公式给出,该公式考虑了MFV标度的主要参数。本文在MFV框架下计算了单圈衰变宽度。与近似结果的比较表明,由于近似衰减公式中忽略了非对数项,大MFV尺度的偏差为10%。分支比的差异可以忽略不计。这些大的木材必须加以修整。通过求解重整化群方程组进行重正化。精确的单回路结果和树水平的味道变化的中性电流衰减,其中包括的mummed的图表的比较,表明,remation效应是重要的,应该考虑。
最近报道的测量CP不对称性a(psi K)的BABAR和BELLE合作是在良好的协议与标准模型预测。在B工厂和强子对撞机上预期的a(psi K)精度下,人们希望能确定任何可能的SM偏差。我们讨论的扩展的MFV超对称模型,舒适地适应目前的测量CP不对称性(psi K),但不同于SM由于一个额外的味道改变结构以外的CKM矩阵。我们分析了这个模型与目前的数据的兼容性,并建议在即将到来的实验在B物理的具体测试。除了B介子衰变中的CP不对称性和Bs-bar(Bs)质量差外,我们还强调辐射跃迁b -> d γ的测量,作为假定的变味结构的灵敏探针。有趣的是,这些模型中的CKM-么正性分析也允许gamma > pi/2的解,其中gamma=-arg(Vub)。如此大的伽马值是由当前对衰变B -> pi pi和B -> K pi的分支比的测量所暗示的。