在这些诉讼中，我提出了一个个人的角度来看，新的物理（NP）搜索在风味部门的挑战。由于CKM的味道违反机制已经建立了一个非常高的精度，我们知道，物理超越标准模型只能作出贡献次主导。因此，超出标准模型（SM）的任何实际物理模型必须尊重来自味道可观测量（如$b\to s γ$、$B_s\toμ^+μ^-$、$ΔF=2$过程等）的严格约束，在第一步中。在第二步中，有趣的是问一个问题，如果一些偏离SM预测（如μ子的异常磁矩或最近观察到的τ子$B$衰变或$B\to K^*μ^+μ^-$的差异）可以用NP模型来解释，而不违反其他观测值的界限。
英文摘要：
In these proceedings I present a personal perspective of the challenges for new physics (NP) searches in the flavour sector. Since the CKM mechanism of flavour violation has been established to a very high precision, we know that physics beyond the Standard Model can only contribute sub-dominantly. Therefore, any realistic model of physics beyond the Standard Model (SM) must respect the stringent constrains from flavour observables like $b\to s γ$, $B_s\toμ^+μ^-$, $ΔF=2$ processes etc., in a first step. In a second step, it is interesting to ask the question if some deviations from the SM predictions (like the anomalous magnetic moment of the muon or recently observed discrepancies in tauonic $B$ decays or $B\to K^*μ^+μ^-$) can be explained by a model of NP without violating bounds from other observables.
We demonstrate that flavour-changing neutral currents in the top sector, mediated by leptophilic scalars at the electroweak scale, can easily arise in scenarios of new physics, and in particular in composite Higgs models. We moreover show that such interactions are poorly constrained by current experiments, while they can be searched for at the LHC in rare top decays and, more generally, in the channels $pp\to tS(S)+j$, with $S\to\ell^+\ell^-$. We provide dedicated analyses in this respect, obtaining that cut-off scales as large as $Λ\sim$ 90 TeV can be probed with an integrated luminosity of …
In extensions of the Standard Model with two Higgs doublets, flavour changing Yukawa couplings of the neutral scalars may be present at tree level. In this work we consider the most general scenario in which those flavour changing couplings are absent. We re-analyse the conditions that the Yukawa coupling matrices must obey for such \emph{general flavour conservation} (gFC), and study the one loop renormalisation group evolution of such conditions in both the quark and lepton sectors. We show that gFC in the leptonic sector is one loop stable under the Renormalization Group Evolution (RGE) and…
We investigate solutions to the flavour anomalies in $B$ decays based on loop diagrams of a "split" dark sector characterised by the simultaneous presence of heavy particles at the TeV scale and light particles around and below the $B$-meson mass scale. We show that viable parameter space exists for solutions based on penguin diagrams with a vector mediator, while minimal constructions relying on box diagrams are in strong tension with the constraints from the LHC, LEP, and the anomalous magnetic moment of the muon. In particular, we highlight a regime where the mediator lies close to the $B$-…
A three Higgs-doublet model admitting an $S_3$-symmetry can predict the observed pattern of the quark masses and their mixings. However the same symmetry also introduces potential flavour-changing neutral currents at the tree level. We assume in this work that the scalar potential contains appropriate \emph{soft} $S_3$-breaking terms in order to keep the choices of the scalar masses flexible. We identify the parameters in the Yukawa Lagrangian in the quark sector responsible for such FCNCs and constrain them using data from some of the flavour physics observables like meson-decays and meson-mi…
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}。
S3 as a flavour symmetry for quarks and leptons after the Daya Bay result on θ13
我们提出了一个基于味群S3 X Z3 X Z6的模型来解释费米子质量和混合的主要特征。特别是在中微子区，S3对称性的破缺导致了自然很小的r=Δm^2_sol/Δm^2_atm，适当的次序修正使θ13达到约0.13的水平，这与最近大亚湾的结果完全一致。在夸克扇区中，该模型适应了上夸克扇区和下夸克扇区中不同的质量等级，以及正确范围内的Cabibbo角和Vcb（或Vub，取决于右手b夸克的电荷分配）。
我们描述了一个超对称模型的味道变化的中性电流部门的现象，不变的T'离散味群。该模型已在参考文献中提出。[1]描述了现实的轻子和强子质量和混合，并预测了在[0.007，0.05]中根据小味破缺参数u的味变化量。对于较小的u值，模型几乎简化为MSUGRA框架，而当考虑较大的u和tan（β）值时，可以观察到与MSUGRA相当大的偏差。我们详细分析了T' BR（μ-> e γ）预测，关于轻子部门，而强子部门，我们集中在b -> s γ和中性B介子质量差。此外，还首次对T'模型的轻子和强子观测量进行了比较研究。FCNC观测量的实验数据在小m_0区严重限制了模型。反之，对于较大的m_0，T'模型满足所有的界.
Leptoquarks are ubiquitous in several extensions of the Standard Model and seem to be able to accommodate the universality-violation-driven $B$-meson-decay anomalies and the $(g-2)_μ$ discrepancy interpreted as deviations from the Standard Model predictions. In addition, the search for lepton-flavour violation in the charged sector is, at present, a major research program that could also be facilitated by the dynamics generated by leptoquarks. In this article, we consider a rather wide framework of both scalar and vector leptoquarks as the generators of lepton-flavour violation in processes in…
We report the masses of $B$ and $D$ sectors heavy-flavoured mesons obtained by using our recently developed meson wave function employing potential model approach with linear confinement term in potential as parent in the perturbation method. As the wave-function involves infinite Airy's polynomial series, in carrying out the mass calculation, to avoid divergences, we have introduced some cut-off parameter for inter-quark separation. Our results for ground state masses of heavy-flavoured $B$ and $D$ sector mesons are reasonably closer to the PDG masses.
We give a brief introduction to flavour physics. The first part covers the flavour structure of the Standard Model, how the Kobayashi-Maskawa mechanism is tested and provides examples of searches for new physics using flavour observables, such as meson mixing and rare decays. In the second part we give a brief overview of the recent flavour anomalies and how the Higgs can act as a new flavour probe.
