Talk Titles and Abstracts

Minimal dilaton model
Abstract:
We construct a minimal calculable model of a light dilaton based on the scenario where only top and Higgs sectors are involved in a quasiscale invariant dynamics. The model consistently accommodates the electroweak precision tests even when the Higgs boson is very heavy, thereby allowing one to consider the possibility that the particle at around 125 GeV, discovered at the LHC experiments, is identified as the light dilaton rather than the Higgs boson. We find that the current LHC data allow distinct parameter regions where the observed particle is either mostly the Higgs boson or the dilaton.
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In-medium QCD forces at high temperature
Abstract:
The physics of heavy quarkonium suppression has been discussed in the context of screened QCD force in medium for a long time. In this presentation, I will show that another type of force, namely the drag force and its fluctuation, also plays an important role in the real-time dynamics of heavy quarkonium in the medium. In order to make this statement specific, I will employ the closed-time path formalism of non-equilibrium quantum field theory and perform perturbative analysis. This will tell us how these different types of forces determine the dynamics of quantum states of heavy quark systems in the medium.
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Abstract:
Progress on the potential method, recently proposed to investigate hadron interactions in lattice QCD, is introduced. The strategy to extract the potential in lattice QCD is explained in detail. The method is applied to extract $NN$ potentials, hyperon potentials and other systems. Some recent applications of the method are also discussed.
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Vector Boson Signals of Electroweak Symmetry Breaking
Abstract:
We study the physics potential of the 8TeV LHC to discover, during its 2012 run, a large class of extended gauge models or extra dimensional models whose low energy behavior is well represented by an SU(2)^2 x U(1) gauge structure. We analyze this class of models and find that with a combined integrated luminosity of 40-60/fb at the LHC-8, the first new Kaluza-Klein mode of the W gauge boson can be discovered up to a mass of about 370-400 GeV, when produced in association with a Z boson.
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IR fixed points from lattice simulations
Abstract:
We discuss the field-theoretical signatures of the existence of an IR fixed point in the RG flow of gauge theories, and examine the possibility of identifying such fixed points by numerical simulations of quantum field theories regulated on the lattice.
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Top-seesaw assisted technicolor model and a m=126 GeV scalar
Abstract:
We consider a model of strong dynamics able to account for the origin of the electroweak symmetry breaking and heavy quark masses. The model is based on a technicolor sector, augmented with topcolor and top-seesaw mechanism to assist in the generation of heavy quark masses. The low energy effective theory is a particular three Higgs doublet model. The additional feature is the possibility of the existence of composite higher spin states beyond the scalars, which are shown to be essential in this model to provide extra contributions in the higgs decays into two photons. We provide a detailed strategy and analysis how this type of models are to be constrained with the present data.
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RG cycles
Abstract:
At points along a cycle in the flow of a relativistic quantum field theory (QFT) displays invariance under special conformal transformations. These CFTs have non-vanishing beta functions. Little is known about them. Their exploration have led to a long sought proof that a scale invariant QFT is necessarily a CFT.
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Large-Nc gauge theory and chiral random matrix theory
Abstract:
The chiral random matrix theory (chi-RMT) is a useful tool to study QCD and QCD-like gauge theories. In this paper we consider how to apply the chi-RMT techniques to the large-$N_c$ gauge theory. We find that, in order for the gauge theory to be described by the chi-RMT, the quark mass must be scaled appropriately with Nc. This scaling is different from the 't Hooft large-Nc limit in which the mass is fixed, and hence the comparison of the chi-RMT and the large-$N_c$ gauge theory requires some care. As an explicit demonstration, we detect the chiral symmetry breakdown in the quenched QCD by comparing the Eguchi-Kawai model and the chi-RMT. This talk is based on the work with Jong-Wan Lee, Norikazu Yanmada, which will appear in hep-lat soon.
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Holographic Mean-Field Theory for Baryon Many-Body Systems
Abstract:
We propose a mean-field approach to analyze many-body systems of fermions in the gauge/gravity duality. We introduce a nonvanishing classical fermionic field in the gravity dual, which we call the holographic mean-field for fermions. The holographic mean-field takes account of the many-body dynamics of the fermions in the bulk. The regularity condition of the holographic mean-field fixes the relationship between the chemical potential and the density unambiguously. Our approach provides a new framework of gauge/gravity duality for finite-density systems of baryons in the confinement phase.
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Reaching the chiral limit in many flavor systems
Abstract:
Distinguishing conformal and chirally broken systems is the first, and surprisingly difficult, task of lattice studies. In this talk I will discuss several methods, including the scaling of the Dirac eigenmodes, finite temperature transitions and renormalization group inspired methods that we used recently with many flavor systems. I will compare and contrast the results obtained with 4, 8 and 12 fundamental flavors and show that the most unexpected system - contrary to expectations- is the 8 flavor one in the chiral limit.
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"Super"- Dilatation Invariance of Top-Higgs system
Abstract:
We discuss a generalization of Higgs-dilatational invariance that involves a "super" rotation between the top quark and Higgs. It is an exact symmetry of top quark and Higgs kinetic terms in the gauge-less limit. This yields a SUSY-like tree level relationship, M_top = M_Higgs, and can be commensurate with the observed M_Higgs = 126 GeV through radiative corrections. It suggests a possible new multi-TeV sale dynamics.
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Composite Higgs and Techni-dilaton at LHC
Abstract:
We consider the possibility of having light composite Higgs and light techno-dilaton in models of technicolor. We then discuss constraints on their mixing and couplings to SM particles in light of current LHC data.
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Implication of 126 GeV Higgs for Planck scale physics - Hierarchy problem and TeV scale B-L -
Abstract:
The recent discovery of the Higgs at 126 GeV has given us a big hint towards the origin of the Higgs potential. Especially the running quartic coupling vanishes near the Planck scale, which indicates a possible link between the physics in the EW scale and the Planck scale. Motivated by this and the hierarchy problem, we investigate a possibility that the Higgs has a flat potential at the Planck scale. In particular we consider a B-L extension of the SM. The B-L symmetry is radiatively broken at the TeV scale via the Coleman-Weinberg mechanism. The electroweak symmetry breaking is triggered by a radiatively generated scalar mixing so that the EW breaking scale is dynamically determined by the B-L breaking scale.
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Conformal Window and Correlation Functions in Lattice Conformal QCD
Abstract:
First we make a brief review of our previous works on the phase structure of lattice gauge theories and thereby clarify the reason why we conjecture that the conformal window is $7 \le N_f \le 16$. Secondly, proposing new predictions for fundamental issues such as the characteristics of correlation functions in Lattice Conformal QCD, we compare our numerical results with our predictions for Nf=7 and Nf=16. Thirdly, we point out that the correlation function at $T/T_c > 1$ exhibits the characteristics of Conformal Lattice QCD.
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Lattice QCD with 12 Quark Flavors: A Careful Scrutiny
Abstract:
Studying strongly coupled gauge theories with walking or conformal behavior on the lattice seriously challenges our understanding of lattice QCD methodology. Without the help of real world experiments, great care must be exercised in interpreting results from numerical computations. With a substantial amount of simulations, we have explored the system across a wide range of lattice scales. We have located a lattice artifact, bulk transition, and have studied its properties. I will show how continuum physics is wildly distorted by this lattice artifact, and discuss what is needed to approach and uncover the true continuum.
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Latest ATLAS results on Higgs and BSM physics
Abstract:
After the announcement of the newly found boson in July, significant efforts to understand its properties and its identification have been carried out. In parallel, the number of programs to search for the BMS physics have been continued with more intense. In this talk, the latest results on the measurements and the search activities from the ATALS experiment are reviewed.
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Generalized Skyrmions and Mass of the Lightest Electroweak Baryon
Abstract:
In general, an effective low-energy Lagrangian model of composite electroweak symmetry breaking contains soliton solutions that may be identified with technibaryons. The masses of such states may be related to the coefficients of fourth-order terms in the effective Lagrangian, like in QCD. We show how the current theoretical and phenomenological constraints on the corresponding fourth-order coefficients in the electroweak theory could be used to estimate qualitative lower and upper bounds on the lightest electroweak baryon mass. We point out that in strongly-interacting models of electroweak symmetry breaking, non-Skyrmion-like soliton is also possible. This possibility will be constrained by future LHC measurements and dark matter experiments. Current upper bounds on the electroweak soliton mass range between 18 and 59 TeV, which would be reduced to 4.6 to 8.1 TeV with the likely sensitivity of LHC data to the fourth-order electroweak Lagrangian parameters.
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Partially Composite Higgs in Supersymmetry
Abstract:
We propose a framework for natural breaking of electroweak symmetry in supersymmetric models, where elementary Higgs fields are semi-perturbatively coupled to a strong superconformal sector. The Higgs VEVs break conformal symmetry in the strong sector at the TeV scale, and the strong sector in turn gives important contributions to the Higgs potential, giving rise to a kind of Higgs bootstrap. A Higgs with mass 125GeV can be accommodated without any fine tuning. A Higgsino mass of order the Higgs mass is also dynamically generated in these models. The masses in the strong sector generically violate custodial symmetry, and a good precision electroweak fit requires tuning of order \sim 10%. The strong sector has an approximately supersymmetric spectrum of hadrons at the TeV scale that can be observed by looking for a peak in the WZ invariant mass distribution, as well as final states containing multiple W, Z, and Higgs bosons.
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New Confinement Phases from Singular SQCD Vacua
Abstract:
We discuss confinement as a deformation of infrared fixed point SCFT's in supersymmetric gauge theories. This work is based on the recent improvement of our understanding of SCFT in N=2 supersymmetric QCD by the works of Argyres, Seiberg, Gaiotto, Tachikawa, Giacomelli and others, and points towards the idea that confinement in QCD might be associated with the dynamics of strongly-coupled non-Abelian monopoles.
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Can the Higgs impostor hide close to the conformal window?
Abstract:
The most important challenges presented by large scale BSM lattice simulations of strongly interacting gauge theories are examined and technical limitations to overcome are identified. Plans for new BSM lattice strategies far from the conformal window are briefly reviewed. One of the main motives of the talk is the potential role of the conformal edge in BSM lattice models. Recent results suggest that some gauge theories close to the conformal window could hide a light scalar state with quantum numbers of the Higgs impostor. This state could emerge as the pseudo-Goldstone dilaton from spontaneous symmetry breaking of scale invariance. Even without association with the dilaton, the scalar Higgs-like state can be light very close to the conformal window. The sextet model is used for illustration to show how new lattice Higgs projects are making progress to resolve these important questions.
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Abstract:
The conformal symmetry in strong copuling gauge theories like QCD has been one of the inetersting subjects. The related scalar field, dilaton, can emerge as a realization of the symmetry. The possible role of dilaton in dense hadronic matter will be discussed in connection to the chiral symmetry realization, dilaton limit.
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Baryonic matter from hidden local symmetry induced from holographic models
Abstract:
In an effort to access dense baryonic matter relevant for compact stars in a unified framework that handles both single baryon and multibaryon systems on the same footing, we first address a holographic dual action for a single baryon focusing on the role of the infinite tower of vector mesons deconstructed from five dimensions. Then, we provide the complete and parameter free calculation of the Skyrmion properties in a chiral Lagrangian for $\rho$, $\omega$ and $\pi$ included by the hidden local symmetry up to $\mathcal{O}(p^4)$ including all of the homogeneous Wess-Zumino terms. We point out the surprisingly important role of the $\omega$ meson that figures in the Chern-Simons term that encodes chiral anomaly in the baryon structure and that may be closely tied to short-range repulsion in nuclear interactions. Finally, we extend the model to study dense matter by putting the Skyrmions on crystal lattice and determine where in density a Skyrmion (or instanton) transforms to two half-Skyrmions which is important in calculating the EoS for compact-star matter. From the crystal results, we also try to discuss the implications of our results on the nucleon mass and dense matter in confinement problem of QCD.
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D-term Dynamical SUSY Breaking
Abstract:
Under a few mild assumptions, N=1 supersymmetry in four dimensions is shown to be spontaneously broken in a metastable vacuum in a self-consistent Hartree-Fock approximation of BCS/NJL type to the leading order, in the gauge theory specified by the gauge kinetic function and the superpotential of adjoint chiral superfields, in particular, that possesses N=2 extended supersymmetry spontaneously broken to N=1 at tree level. We derive an explicit form of the gap equation, showing the existence of a nontrivial solution. The N=2 gauginos in the observable sector receive mixed Majorana-Dirac masses and are split due to both the non-vanishing <D> and <F> induced with <D>. It is argued that proper physical applications and assessment of the range of the validity of our framenwork are made possible by rendering the approximation into $\frac{1}{N^2}$ expansion.
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125 GeV Techni-dilaton at the LHC
Abstract:
Techni-dilaton (TD) is predicted in walking techni-color, arising as a pseudo Nambu-Goldstone boson for the spontaneous breaking of the approximate scale symmetry trigerred by the techni-fermion condensation. Hence the TD mass can be as light as 125 GeV consistently with the presently observed boson at the LHC. I will talk about the LHC TD signals at 125 GeV and show that they are favored by the currently available 125 GeV boson data and can be better than the standard model Higgs boson.
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Dynamics with isospin symmetric Higgs boson: the quark mass hierarchy and the LHC data
Abstract:
The dynamics in a model with isospin symmetric Higgs boson is discussed. It is shown that the properties of a new 125 GeV boson discovered at LHC, including the enhancement of its diphoton decay rate, can be explained in this model. The predictions of the model relevant for future experiments are also discussed.
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Thermodynamic Lattice Study for (Pre-)conformal Dynamics in Strongly Flavored QCD-Like Theory
Abstract:
Emergence of a conformal and/or a preconformal (walking) dynamics in strongly flavored non-Abelian gauge theories has been advocated as a dynamical origin of the electroweak symmetry breaking and a mass creation in the standard model. By using the lattice Monte-Carlo simulation, we investigate the color SU(3) gauge theories with various species of fundamental fermions, and discuss the signal of the conformality at large Nf (num. of flavors.) from their comparisons. We utilize a finite T step-scaling associated with the chiral phase transition at each Nf, then the vanishing step-scaling signals the emergence of the conformality. Further, we examin the Nf dependence of the critical temperature (Tc) in the potential scheme renormalization. In the relevant scale setting scheme, the decreasing (vanishing) Tc indicates the conformality (walking) dynamics.
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Quark-Gluon Plasma: From RHIC to LHC
Abstract:
When nuclear matter is heated beyond a temperature of 2 trillion degrees, it converts into a strongly coupled plasma of quarks and gluons. Experiments at RHIC and LHC using highly energetic collisions between heavy nuclei have revealed that this new state of matter is a nearly ideal, highly color opaque liquid. My lecture will review the current status of our knowledge of the properties of this matter and various attempts understand how these properties emerge from the underlying gauge theory (QCD).
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Exploring walking behavior in SU(3) gauge theory with 8 HISQ quarks
Abstract:
We present the report of the LatKMI collaboration on the lattice QCD simulation for the cases of 8 flavors. The Nf=8 in particular is interesting from the model-building point of view: The typical walking technicolor model with the large anomalous dimension is the so-called one-family model (Farhi-Susskind model). Thus we explore the walking behavior in LQCD with 8 HISQ quarks by comparing with the 4-flavor case (in which the chiral symmetry is spontaneously broken). We report preliminary results on the meson mass spectrum, analyzed through the chiral perturbation theory and the finite-size hyperscaling.
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From Lattice Strong Dynamics to Phenomenology
Abstract:
In strongly-coupled models of BSM physics, such as composite Higgs scenarios, low-energy effective descriptions can allow analytic calculations to make contact with experiment. The low-energy constants of this effective theory are not free parameters, but are determined by the underlying (non-perturbative) strong dynamics. I will present simulation results from the Lattice Strong Dynamics collaboration focused on the evolution of SU(3) gauge theories as the conformal window is approached from below. Results to be shown include the chiral condensate, S-parameter, W-W scattering, and form factors for dark matter direct detection.
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Dynamical model based on hydrodynamics for relativistic heavy ion collisions
Abstract:
Since the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) started its operation in 2000, a lot of discovery has been made and a lot of insight related to QCD phase transition and the Quark-Gluon Plasma (QGP) has been gained. One of the most physically interesting and surprising outcomes at RHIC is the production of the strongly interacting QGP (sQGP). This accomplishment was realized by combining investigations from both experimental and theoretical sides. One of them is achieved by analyses of strong elliptic flow, which suggests early thermalization and early formation of collectivity. This feature can be understood by relativistic hydrodynamic model. Now hydrodynamic model is considered as one of promising phenomenological models for description for relativistic heavy ion collisions. Here I will show our latest progress of construction of dynamical model based on hydrodynamics and discuss higher harmonics which are produce though event-by-event fluctuations at RHIC and LHC.
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Lattice study of conformality in twelve-flavor QCD
Abstract:
We study infrared conformality of the twelve-flavor QCD on the lattice. Utilizing the highly improved staggered quarks (HISQ) type action which is useful to study the continuum physics, we analyze the lattice data of the mass and the decay constant of a pseudoscalar meson and the mass of a vector meson as well at several values of lattice spacing and fermion mass. Our result is consistent with the conformal hypothesis for the mass anomalous dimension $\gamma_m \sim 0.4 - 0.5$.
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Twisted reduction in large N QCD with adjoint Wilson fermions
Abstract:
The twisted reduced model of large N QCD with two adjoint Wilson fermions is studied numerically using the Hybrid Monte Carlo method. This is the one-site model, whose large N limit (large volume limit) is expected to be conformal or nearly conformal. The string tension calculated at N=289 approaches zero as we decrease quark mass and the preliminary value of the mass anomalous dimension \gamma^* is close to one if we assume that the theory is governed by an infrared fixed point. We also discuss the twisted reduced model with one adjoint Wilson fermion which is supposed to be a confining theory.
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Holographic Technidilaton and LHC searches
Abstract:
We discuss the properties of a class of holographic models of dynamical electro-weak symmetry breaking in which a parametrically light composite scalar state is present in the spectrum. This particle is identified with the technidilaton, and it has couplings qualitatively similar to those of the Higgs particle of the Standard Model. The detailed study of its couplings allows to predict its production and decay processes at the LHC, and hence to discuss experimental strategies to distinguish it from the Higgs particle in high-statistics LHC data.
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The scalar spectrum of many-flavour QCD
Abstract:
The LatKMI collaboration is studying the dynamical properties of Nf=4,8,12,16 SU(3) gauge theories using lattice simulations with (HISQ) staggered fermions. Exploring the spectrum of many-flavour QCD, and its scaling near the chiral limit, is mandatory in order to establish if one of these models realises the Walking Technicolor scenario. Although the lattice technologies to study the mesonic spectrum are well developed, scalar flavour-singlet states still require extra effort to be determined. In addition, gluonic observables usually require large statistic simulations and powerful noise-reduction techniques. In this talk I will present useful spectroscopic methods to investigate scalar glueballs and scalar flavour-singlet mesons, together with the current status of the scalar spectrum from the LatKMI collaboration.
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Technicolor after the Higgs Discovery
Abstract:
Strong dynamics constitutes one of the pillars of the standard model of particle interactions, and it accounts for the bulk of the visible matter in the universe. It is therefore a well posed question to ask if the rest of the universe can be described in terms of new highly natural four-dimensional strongly coupled theories. The goal is to provide a coherent overview of how new strong dynamics can be employed to address the relevant challenges in particle physics and cosmology from composite Higgs dynamics to dark matter and inflation. I will first introduce the topic of dynamical breaking of the electroweak symmetry also known as technicolor and discuss the impact that the discovery of the Higgs-like state at the LHC has on these models. In particular I will show that several natural four dimensional strongly coupled theories can feature light composite Higgs-like states. Further, I will argue that the mass of the composite Higgs does not have to be as light as the observed physical mass due to the standard model radiative corrections. I will also propose new paradigms featuring composite dynamics that can be tested at the LHC.
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Higgs mass and scale of new physics
Abstract:
I will discuss the lower Higgs boson mass bounds which come from the absolute stability of the Standard Model (SM) vacuum and from the Higgs inflation, as well as the prediction of the Higgs boson mass coming from asymptotic safety of the SM.
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Non-Abelian dual superconductivity in SU(3) Yang-Mills theory due to non-Abelian magnetic monopoles
Abstract:
The dual superconductivity is the promising mechanism for quark confinement. We have proposed the non-Abelian dual superconductivity picture in the SU(3) Yang-Mills theory, and already presented numerical evidences for the restricted U(2)-field dominance and the non-Abelian magnetic monopole dominance in the string tension, by applying our new formulation of Yang-Mills theory to a lattice. In this talk, we focus on the non-Abelian dual Meissner effect and the type of dual superconductivity. We find that the measured chromo-electric flux tube between a quark and antiquark pair strongly supports the non-Abelian dual Meissner effect due to non-Abelian magnetic monopoles. Moreover, we give a remarkable result that the type of the resulting dual superconductor is the type I in SU(3) Yang-Mills, rather than the border between the type I and II, in marked contrast to the SU(2) case.
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Non-Abelian Strings in Supersymmetric Yang-Mills
Abstract:
I give a broad review of novel phenomena discovered in Yang-Mills theories: non-Abelian strings and confined monopoles. Then I explain how these phenomena allow one to study strong dynamics of gauge theories in four dimensions from two-dimensional models emerging on the string world sheet.
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Studies on the UV to IR Evolution of Gauge Theories and Quasiconformal Behavior
Abstract:
We describe recent results from our studies of the UV to IR evolution of asymptotically free vectorial gauge theories and quasiconformal behavior. These include higher-loop calculations of the IR zero of the beta function and of the anomalous dimension of the fermion bilinear. Effects of scheme-dependence of higher-loop results are assessed in detail. Applications to models with dynamical electroweak symmetry breaking and relevance to the LHC 126 GeV boson are discussed. This talk contains results from our papers arXiv:1011.4542, 1202.1297, 1206.2366, 1206.6895 with T. A. Ryttov, all published in Phys. Rev. D, together with some new results.
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Coloron Models and LHC Phenomenology
Abstract:
This talk discusses the possibility of new physics in the strong interactions. The general model building possibilities will be reviewed and a new model that incorporates flavor physics will be introduced. Phenomenological constraints and future searches the LHC and elsewhere will be discussed, along with the implications for additional model-building.
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On gauge theory phase diagrams at zero and finite temperature
Abstract:
There is an ongoing progress to study gauge theory phase diagrams at zero and finite temperature using computational and analytical methods. In this talk we consider first the vacuum phase diagrams, and discuss some recent results obtained in lattice studies of SU(2) and SU(3) gauge theories with improved Wilson fermions in the fundamental or higher representations of the gauge group. Then, we will consider generic features of finite temperature phase diagrams and discuss these in light of current and future lattice simulations as well as some recent results from holography.
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Exploring many flavor QCD with Wilson quark action
Abstract:
I would like to present the status report of our study on many flavor QCD system using Lattice Gauge Theory. The feature of our study is the usage of Wilson fermion, which, in contrary to the KS type fermions, enables us to realize arbitrary number of flavors without any subtlety. This talk may include the study of the running coupling constant and anomalous dimension in 10-flavor QCD and the phase structure of many flavor QCD and some related topics.
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