The open problems and the most recent developments in flavour physics are briefly reviewed. Particular attention is devoted to the current "anomalies" in the CKM picture and their possible interpretation in beyond-the-Standard-Model frameworks.
In these proceedings we provide a brief overview of the status of flavour physics, with focus on opportunities to discover New Physics in flavour-violating decays at current and future colliders.
Based on a view of current flavour physics and motivated by the hierarchy problem and by the pattern of quark masses and mixings, I describe a picture of flavour physics that should give rise in a not too distant future to observable deviations from the SM in Higgs compositeness and/or in B-decays with violations of Lepton Flavour Universality, as hinted by current data, or perhaps even in supersymmetry, depending on the specific realisation.
We present an overview of SuperIso v4.1 which is a public program for the calculation of flavour physics observables. We give examples of using SuperIso to constrain new physics scenarios with kaon physics and present the implications of rare B-decays.
These notes represent a summary of three lectures on flavour and CP violation, given at the CERNs European School of High Energy Physics in 2014. They cover flavour physics within the standard model, phenomenology of CP violation in meson mixing and decays, as well as constraints of flavour observableson physics beyond the standard model. In preparing the lectures (and consequently this summary) I drew heavily from several existing excellent and exhaustive sets of lecture notes and reviews on flavour physics and CP violation [1]. The reader is encouraged to consult those as well as the origina…
These lecture notes provide an introduction to the theoretical concepts of flavour physics and CP violation, based on a series of lectures given at the ESHEP 2016 summer school. In the first lecture we review the basics of flavour and CP violation in the Standard Model. The second lecture is dedicated to the phenomenology of K and B meson decays, where we focus on a few representative observables. In the third lecture we give an introduction to flavour physics beyond the Standard Model, both within the framework of Minimal Flavour Violation and beyond.
We review the recent highlights of theoretical flavour physics, based on the theory summary talk given at FPCP2017. Over the past years, a number of intriguing anomalies have emerged in flavour violating $K$ and $B$ meson decays, constituting some of the most promising hints for the presence of physics beyond the Standard Model. We discuss the theory status of these anomalies and outline possible future directions to test the underlying New Physics.
We propose renormalizable models of new physics that can explain various anomalies observed in decays of B-mesons to electron and muon pairs. The new physics states couple to linear combinations of Standard Model fermions, yielding a pattern of flavour violation that gives a consistent fit to the gamut of flavour data. Accidental symmetries prevent contributions to baryon- and lepton-number-violating processes, as well as enforcing a loop suppression of new physics contributions to flavour violating processes. Data require that the new flavour-breaking couplings are largely aligned with the Yu…
Flavour physics represents one of the most interesting and, at the same time, less understood sector of the Standard Theory. On the one hand, the peculiar pattern of quark and lepton masses, and their mixing angles, may be the clue to some new dynamics occurring at high-energy scales. On the other hand, the strong suppression of flavour-changing neutral-current processes, predicted by the Standard Theory and confirmed by experiments, represents a serious challenge to extend the Theory. This article reviews both these aspects of flavour physics from a theoretical perspective.
在简单介绍了超对称性问题之后,我们将注意力集中在具有MFV和大$\tanβ$的MSSM上。简要回顾了这一设想的理论动机和一般特征。讨论了低能味道违反观测量中可能的特征,特别注意$\BR(P\to\ellν)$、$\BR(B_{s,d}\to \ell^+\ell^-)$和$\BR(μ\to e γ)$所起的作用
We describe SuperIso v4.1, a public code for calculation of flavour observables, in the Standard Model and for New Physics scenarios in a model-independent way as well as for specific beyond the SM models such as two Higgs doublet models (2HDM), minimal supersymmetric Standard Model (MSSM) and next-to-minimal supersymmetric Standard Model (NMSSM).
If observed, charged lepton flavour violation is a clear sign of new physics - beyond the Standard Model minimally extended to accommodate neutrino oscillation data. After a brief review of several charged lepton flavour violation observables and their current experimental status, we consider distinct extensions of the Standard Model which could potentially give rise to observable signals, focusing on the case of models in which the mechanism of neutrino mass generation is the common source of neutral and charged lepton flavour violation.
We present the invited lectures given at the second Asia-Europe-Pacific School of High-Energy Physics (AEPSHEP), which took place in Puri, India in November 2014. The series of lectures aimed at graduate students in particle experiment/theory, covering the very basics of flavor physics and CP violation, some useful theoretical methods such as OPE and effective field theories, and some selected topics of flavour physics in the era of LHC.
We review the Spring 2022 status of the current $B$ anomalies and their possible interpretation in terms of New Phsyics. We also discuss the discovery potential of targeted LHC and future collider searches for the underlying new particles and their complementarity with low-energy flavour observables.
在这篇评论文章中,我们强调的影响模型,将味对称性带电轻子味违反(LFV)的过程。味对称性提供了一个自然的方法来解释特殊的质量等级和混合模式的标准模型费米子。新的LFV源通常存在于标准模型之外的新物理中,并且味道对称性可以对LFV观测值做出独特的预测。他们的发现可以为区分味道对称性和新的物理场景提供重要信息。由于它们的高灵敏度,我们将专注于寻找低能LFV过程,如原子核中的μ-> e γ或μ-e转换,但我们也将强调LFV过程在LHC中的潜在影响。如果新的物理学在大型强子对撞机可以达到的尺度上发生,那么它们诱导的味道算子可能会被高度详细地探测。
The current status of the theory and phenomenology of weak decays of hadrons containing a heavy quark is reviewed. Exclusive semileptonic and rare decays of $B$ mesons are discussed, as well as inclusive decay rates, the semileptonic branching ratio of the $B$ meson, and the lifetimes of $b$-flavoured hadrons. Determinations of $α_s$ from $Υ$ spectroscopy are briefly presented.
我们提出了一个概述,最近的工作中存在的连续第四代风味物理。我们将很快讨论对新参数的限制,并在后面给出对B_s系统中Br(B_s -> mu+ mu-),Br(K -> pi nu nubar)和间接CP破坏S(psi phi)等观测量的预言。我们将进一步强调一旦B_6和B_8的可靠的晶格结果成为可能的约束ε ′/ε ′的重要性。轻子味破坏也简要讨论了在升级的味工厂,以及即将进行的实验μ-> e γ和μ-e转换的原子核中的τ物理的前景。
我们回顾了标准模型中的味物理和CP破坏的主要方面。在介绍了包括弱衰变主公式在内的该领域的宏观观点之后,我们讨论了i)幺正三角形的标准分析,ii)比率ε '/ε',iii)稀有衰变K^+ -> pi^+ nu barnu和K_L -> pi ^0 nu barnu,iv)B衰变中的CP破坏和v)具有最小味破坏的模型。我们的评论以20个问题结束,希望在未来几年内得到回答。
Extending the Standard Model with higher-dimensional operators in an effective-field-theory (EFT) approach provides a systematic framework to study new-physics (NP) effects from a bottom-up perspective, as long as the NP scale is sufficiently large compared to the energies probed in the experimental observables. However, when taking into account the different quark and lepton flavours, the number of free parameters increases dramatically, which makes generic studies of the NP flavour structure infeasible. In this paper, we address this issue in view of the recently observed "flavour anomalies"…
We consider the impact of several flavour-changing observables in the $B$- and the Kaon sectors on the parameter space of the NMSSM, in a minimal flavour violating version of this model. Our purpose consists in updating our previous results in arXiv:0710.3714 and designing an up-to-date flavour test for the public package NMSSMTools. We provide details concerning our implementation of the constraints in a series of brief reviews of the current status of the considered channels. Finally, we present a few consequences of these flavour constraints for the NMSSM, turning to two specific scenarios:…
Precision measures of electroweak and flavour observables, at both low and high energies, are highly complementary to direct searches for New Physics at high-energy colliders. Despite the discovery of the Higgs boson at the Large Hadron Collider, and of the overwhelming successes of the Standard Model, several observational and theoretical problems remain to be addressed. In addition to neutrino oscillation phenomena, the Standard Model fails to explain the baryon asymmetry of the Universe, and does not offer a viable dark matter candidate. In recent years, numerous deviations between the Stan…
Flavour physics, supersymmetry and grand unification
夸克味物理数据的整体拟合不支持标准模型,标准偏差为3.6,并指出介子-反介子混合振幅中新的CP破坏物理。Tevatron数据要求一个新的Bs-Bs-bar混合阶段,Bd-Bd-bar混合中的新物理学阐明了由B(B-> tau nu)驱动的幺正三角形上的张力。在超对称GUT模型中,大的大气中微子混合角会影响b -> s跃迁.我提出了一个SO(10)GUT模型,它容纳了大的Bs-Bs-bar混合相,同时遵守所有其他的实验约束的最新分析结果。
Quark and Lepton Flavour Physics in the Littlest Higgs Model with T-Parity
T宇称的最小希格斯模型(LHT)在夸克和轻子扇区都包含了新的味源和CP破坏。它们起源于新规范玻色子W_H、Z_H和A_H介导的普通费米子与镜像费米子的相互作用。在K_L -> pi ^0 nu {bar nu}、K^+ -> pi^+ nu {bar nu}、CP不对称性S_{psi phi}和轻子味违反衰变中,发现了与标准模型最惊人的偏离。特别是,后者的衰变提供了一个明确的区别LHT模型和MSSM。我们总结了最有趣的结果,三个广泛的分析味道物理的LHT模型。
The purpose of these lectures is to provide the reader with an idea of how we can probe New Physics with quark flavour observables using effective theory techniques. After giving a concise review of the quark flavour structure of the Standard Model, we introduce the effective Hamiltonian for quark weak decays. We then consider the effective Hamiltonian for $ΔF=2$ transitions in the Standard Model and beyond. We discuss how meson-antimeson mixing and CP violation can be described in terms of the $ΔF=1$ and $ΔF=2$ effective Hamiltonians. Finally we present the Unitarity Triangle Analysis and dis…