Subgroup report for the "Electroweak Symmetry Breaking and Beyond the Standard Model" working group of the DPF Long Range Planning Study. The new TeV physics is perturbative, and radiative corrections to the Higgs mass are finite. The model provides no explanation for why electroweak symmetry breaking occurs, or why it occurs at the weak scale. We argue that a braneworld can similarly produce a low-energy breaking of the electroweak symmetry, provided that in addition to the "normal" region, occupied by the conventional phase of QCD, there is a bulk region where the color is in an anisotropic (layered) state with a larger . Precision electroweak constraints are satisfied by construction. A coupling via a real scalar field transmits the breaking scale to the Standard Model Higgs and triggers electroweak symmetry breaking.

Quantum Corrections Connect Weak and Planck Scales By further requiring that the Higgs be a pseudo Nambu-Goldstone boson, a naturally light Higgs boson mass, compared to the IR scale can be obtained. The scale-invariant and CP-symmetric Higgs potential generates radiative electroweak symmetry breaking la Coleman-Weinberg, and gives a natural solution to the hierarchy problem, free from fine-tuning.

The softening of this mass occurs because the Higgs is an extended object in theory space, resulting in an accidental symmetry. Dive into the research topics of 'Electroweak symmetry breaking and singlino . In addition to a SM-like light Higgs boson h of mass 125 GeV, it predicts two new states: one CP-even Higgs serving as the pseudo-Nambu-Goldstone boson of scale symmetry breaking, and a CP-odd scalar . superconductivity. The weak-isospin doublet , where C is the Cabibbo angle, captured the known structure of the hadronic charged-current interaction and expressed the universal strength of quark and lepton . We should check whether the conjecture above agrees with our experience in QCD-like theories. The conditions for perturbativity of quartic couplings and for radiative electroweak symmetry breaking lead to tight upper and lower limits on the dark matter mass, respectively, and this dark matter mass region (1.35-2 TeV) can be probed in future direct detection experiments. download and install Electroweak Symmetry Breaking By Dynamically Generated Masses Of Quarks And Leptons Springer Theses correspondingly simple! avatar of electroweak symmetry breaking in the standard electroweak theory, an excitation of the auxiliary scalar elds introduced to contrive a vacuum that does not respect the full SU(2) . For that scale there is a gauge theory for the electroweak interaction. The first is the one related with FCNCs. Electroweak symmetry breaking is decidedly a minor player. Higgs mass grows with high scale, (a priori =Mpl) H H Points to 1 TeV as scale of new physics. Their investigations encompassed the Standard Model -- with one doublet of Higgs scalars -- and approaches to physics beyond the Standard Model. Electroweak scale W boson mass energy: The first LHC run has confirmed the Standard Model as the correct theory at the electroweak scale, and the existence of a Higgs-like particle associated with the spontaneous breaking of the electroweak gauge symmetry. We discuss several corollaries of this observation, including the interplay between the upper bound on the scale M and the order parameter associated with the breaking of dS symmetry, and entertain the possibility that the relaxion could play the role of a curvaton. AB - Models of Gauge-Higgs unification in extra dimensions offer a very elegant playground where one can study electroweak symmetry breaking. Elementary Higgs: EW scale stabilized by SUSY, EWSB triggered by dynamical SUSY breaking in a strong hidden sector Composite Higgs (5D dual): . This is a central idea in quantum physics in general and quantum field theory (QFT) in particular. Electroweak symmetry breaking occurs radiatively in this class of models, and is equivalent toa Wilson line symmetry breaking [11, 12](orScherk{Schwarz twist [13]), which reduces the rank of H(as required for electroweak symmetry breaking) if the Wilson line and the embedding of the orbifold twist do not commute.

After a brief introduction, the fine-tuning aspects of the MSSM, NMSSM, generalized NMSSM and GMSB scenarios shall be reviewed, then the little Higgs . M . Natural Electroweak Breaking from a Mirror Symmetry Z. Chacko,1 Hock-Seng Goh,1 and Roni Harnik2 . That ques-tion can be addressed experimentally. What's wrong with the SM and a light Higgs? This is an expanded version of the report by the Electroweak Symmetry Breaking and Beyond the Standard . 5 If boththe electroweak symmetry and the approximate scale symmetry arebrokenonlybyelectroweak doubletcondensate(s), then the decay-constants for scale and electroweak symmetry breaking may be approximately equal - diering only by terms formally proportional to the amount of explicit scale-symmetry breaking. A wholeness (overview) chart summarizing and comparing all three models is included, as well as a separate wholeness chart for each particular model. In this letter we propose an alternative dynamics of "inevitable" electroweak symmetry breaking in string theory without supersymmetry with the string scale in TeV region. weak scale does not require new light particles charged under the standard model gauge groups. For the NMSSM, we find a stable electroweak breaking vacuum but with a . For the MSSM we find a stable vacuum when tan < 1, but in this region the top Yukawa coupling blows up only slightly above the supersymmetry breaking scale. [6, 7]. Higgs mass grows with high scale, (a priori =Mpl) H H Points to 1 TeV as scale of new physics. Generating the Electro-Weak Scale by Vector-like Quark VL mass is technically natural as chiral symmetry protects the fermionic mass term [17]. This report will appear as a chapter in Electroweak Symmetry Breaking and Beyond the Standard Model, edited by T. Barklow, S. Dawson, H.E. t. e. In particle physics, the electroweak interaction or electroweak force is the unified description of two of the four known fundamental interactions of nature: electromagnetism and the weak interaction. It suffers from the hierarchy and naturalness problems - namely, if there is physics at some much higher energy (say the GUT or Planck scale), then a precise adjustment of the underlying parameters (i.e. Interactions may have been above this scale during the electroweak epoch. probe to the electroweak symmetry breaking sector. Based on previous extensions of SU(3)$_{c}$ , we consider the case in which the composite sector has a global SU(6) symmetry, spontaneously broken to a subgroup containing SU(3)SU(3). In this case, the strong coupling scale is lowered to a marginally acceptable value, and a more careful analysis of two loop effects should decide if the theory remains under perturbative control. It's possible to explain this stuff fully and correctly, but it's probably going to take longer than you can afford for your students.

decoupling the scale of avor physics from the of electroweak symmetry breaking. The second type is of the form fi,3 Fa h, and breaks the electroweak symmetry, of the same type found in the see-saw mechanism.

Early promises and deadly problems. The short distance divergence in the Higgs-boson mass is regulated . In addition, the Higgs sector respects an approximate global symmetry. We say that the electroweak gauge symmetry is spontaneously broken hiddento the U(1) scale and beyond, and address instead why electroweak symmetry breaking matters for the physical world. Only three quark flavors ( u , d , and s ) were known when the electroweak theory was formulated. At first glance, such a unification hardly seems possible since these two forces mediate very different phenomena. We demonstrate that from a low energy perspective a viable electroweak symmetry breaking can be achieved without the (negative sign) 2 mass term in the Higgs potential, thereby avoiding completely the appearance of relevant operators. The alternative to electroweak symmetry breaking through new strong interactions is the possibility of electroweak sym-metry breaking due to the vacuum expectation values of one or more light scalar elds. First, how fine-tuned different models are that trigger this phenomenon? But when the universe was much hotter so that the equilibrium thermal energy was on the order of 100 GeV, these forces may have appeared to be essentially identical - part of the same unified "electroweak" force. 2005 2005 SM with light Higgs works pretty well!

The higher-dimensional theory is supersymmetric, and hence requires the top-quark Yukawa coupling to be localized on some "Yukawa brane" in the bulk. The electroweak symmetry breaking model of Glashow/Salam/Weinberg is presented in a pedagogic manner by leading up to it with the simpler to understand symmetry breaking models of Goldstone and Higgs. The model contains dark matter candidates in the form of dark pions, whose stability is being guaranteed by the flavor symmetry of hidden quark sector. 2005 2005 SM with light Higgs works pretty well! DOI: 10.1103/PhysRevLett.96.231802 PACS numbers: 14.80.Cp, 11.30.Qc, 12.60.Cn, 12.60.Fr Electroweak symmetry breaking is assumed to be caused by dynamically generated masses of typical fermions, i.e., of quarks and leptons, which in turn assumes a new dynamics between quarks and leptons.

J.J. Thom-son [4] calculated in 1904 the angular momentum of the electromagnetic (EM) eld in the We show that there are regions of parameter space in which electroweak symmetry breaking occurs successfully and the lightest Higgs is heavier than the LEP bound. the electroweak symmetry breaking and the masses for the physical W and Z gauge bosons. The tuning is less than 10% in almost all of the phenomenolog- .

A coupling via a real scalar field transmits the breaking scale to the Standard Model Higgs and triggers electroweak symmetry breaking. . CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Electroweak symmetry can be naturally broken by observed quark and gauge fields in various extra-dimensional configurations. Then we get again electromagnetism (QED). Additional four-fermion interactions with weaker couplings could be . It can be shown [30, 31] that the requirements of spontaneous CP symmetry breaking at the EW scale, absence of FCNCs at tree level3 , and a realistic CKM matrix cannot be simultaneously satisfied. The electroweak symmetrybreaking is triggered by negative mass squared of the elementary Higgs doublet, whichis dynamically generated through the bosonic seesaw mechanism. We show that there are regions of parameter space in which electroweak symmetry breaking occurs successfully and the lightest Higgs is heavier than the LEP bound.

In some cases the term electroweak scale is used to refer to the temperature of electroweak symmetry breaking, 159.51.5 GeV . Our model is distinct from others of this type that have appeared in the recent literature. We show that the Higgs sector of the model is phenomenologically viable and that the distance scales, based on the degrees of freedom most relevant to the phenomena that occur there. We examine schemes in which the QCD gauge group alone, in compact extra dimensions, forms a . We can rule out this alternative if these Our approach is to analyze closely what the world would be like in the absence of electroweak symmetry break-ing at the usual scale (v = 21/4 G1/2 F 246 GeV), whether by the conventional Higgs mechanism or by any Since the tree- Theoretical developments over the past decade have led to viable models and mechanisms that are consistent with current experimental data. The electroweak symmetry breaking is triggered dynamically via the Higgs portal by the condensation of the colored scalar field around $1$ TeV. Theories of dynamical electroweak symmetry breaking can be classied by the nature of the Haber, and J. Siegrist, to These models .

. General arguments such as unitarity [33, 34] indicate that new physics associated with the electroweak symmetry breaking must show up in some form at the scale of TeV, which can be accessible most likely only at higher energy colliders of next generation.