Conveners
Physics Beyond the Standard Model
- C.-J. David Lin
Physics Beyond the Standard Model
- Claudio Rebbi
Physics Beyond the Standard Model
- Julius Kuti
Physics Beyond the Standard Model
- Daniel Nogradi
Physics Beyond the Standard Model
- Hiroshi Ohki
Physics Beyond the Standard Model
- Noboru KAWAMOTO
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Dr Hiroshi Ohki (RIKEN)14/07/2015, 14:00Physics Beyond the Standard ModelTalkIn the search for a realistic walking technicolor model, QCD with many flavors is an attractive candidate. From the series of studies by the LatKMI collaboration, we present updated results of the scaling properties of various hadron spectra, including the (pseudo)scalar, vector, and baryon channels, for Nf=8 QCD with the HISQ action. By comparing these with Nf=12 QCD, which has...Go to contribution page
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Dr Ed Bennett (Swansea University)14/07/2015, 14:20Physics Beyond the Standard ModelTalkSU(3) gauge theory with eight massless flavours is believed to be walking, while the corresponding twelve- and four-flavour appear IR-conformal and confining respectively. Looking at the simulations performed by the LatKMI collaboration of these theories, we use the topological susceptibility as an additional probe of the IR dynamics. By drawing a comparison with SU(3) pure gauge theory, we...Go to contribution page
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Dr Masafumi Kurachi (KEK)14/07/2015, 14:40Physics Beyond the Standard ModelTalkLatKMI Collaboration has been studying SU(3) gauge theories with 4, 8, 12 and 16 fundamental fermions by using HISQ action on the lattice. This talk is dedicated to show results of Nf=4 simulations. We first show the m_rho/ f_pi ratio, from which we see Nf=4 SU(3) gauge theory is quite similar to the actual QCD. Then, weโll show preliminary results of flavor-singlet scalar bound state and give...Go to contribution page
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Prof. Claudio Rebbi (Boston University)14/07/2015, 15:00Physics Beyond the Standard ModelTalkAfter a brief review of the motivation for studying an SU(3) theory with four light flavors and eight flavors of variable mass I will discuss the methodologies we have used to investigate the properties of the system. I will then illustrate some recent results. More detailed results will be given in another talk. We will also illustrate some results of a study of the SU(3) theory with...Go to contribution page
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Evan Weinberg (Boston University Department of Physics)14/07/2015, 15:20Physics Beyond the Standard ModelTalkWe investigate an SU(3) gauge theory with four light flavors and eight heavy flavors of variable mass as a model of near conformal dynamics. By continuously varying the mass of the eight heavy flavors we can tune between chirally broken and conformal behavior. We report on recent progress with probing this model deeper in the light flavor chiral regime, including updated measurements of a...Go to contribution page
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Dr YU NAKAYAMA (Caltech)14/07/2015, 15:40Physics Beyond the Standard ModelTalkWe propose a novel RG method to specify the location of the IR fixed point in lattice gauge theories and apply it to the $SU(3)$ gauge theories with $N_f$ fundamental fermions. It is based on the scaling behavior of the propagator through the RG analysis with a finite IR cut-off, which we cannot remove in the conformal field theories in sharp contrast with the confining theories. The method...Go to contribution page
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Prof. Julius Kuti (U.C. San Diego)14/07/2015, 16:30Physics Beyond the Standard ModelTalkA low mass scalar state has been observed by the Lattice Higgs Collaboration as a viable candidate for the minimal realization of the composite Higgs from a fermion doublet in the two-index symmetric representation of the SU(3) color gauge group. The difficulty of decoupling Goldstone dynamics from the low mass scalar state in realistic simulations requires the extension of the low energy...Go to contribution page
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Mr wong chik him (university of wuppertal)14/07/2015, 16:50Physics Beyond the Standard ModelTalkThe SU(3) gauge theory with two flavors of two-index symmetric (sextet) fermions has been of great interest recently since a low-mass scalar meson that may serve as a composite Higgs candidate was observed in our previous studies. The hadron spectrum analysis on a more extended dataset will be presented as a followup investigation.Go to contribution page
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Mr santanu Mondal (Eรถtvรถs Lorรกnd University)14/07/2015, 17:10Physics Beyond the Standard ModelTalkWe show the cutoff dependence of taste symmetry breaking on the full staggered Goldstone spectrum in the sextet model. Taste symmetry in the Goldstone valence spectrum is restored using a mixed action setup on the gauge field gradient flow.Go to contribution page
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Daniel Nogradi (Eotvos University)14/07/2015, 17:30Physics Beyond the Standard ModelTalkThe renormalized running coupling of SU(3) gauge theory coupled to Nf = 2 flavors of massless Dirac fermions in the 2-index-symmetric (sextet) representation is calculated. This model is of particular interest as a minimal realization of the strongly interacting composite Higgs scenario. A recently proposed finite volume gradient flow scheme is used. The calculations are performed at several...Go to contribution page
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Mr Martin Hansen (CP3-Origins, University of Southern Denmark)14/07/2015, 17:50Physics Beyond the Standard ModelTalkWe present new results from our simulations of the SU(3) "sextet model" with two flavors in the 2-index symmetric representation of the gauge group. The simulations use unimproved Wilson fermions and we measure the meson and baryon spectrum of the theory for multiple bare quark masses at two different lattice spacings. To address the ongoing issue of whether the model is inside or outside the...Go to contribution page
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183. Lattice study for conformal windows of SU(2) and SU(3) gauge theories with fundamental fermionsProf. C.-J. David Lin (National Chiao-Tung University)15/07/2015, 14:00Physics Beyond the Standard ModelTalkWe present results from our study of SU(2) gauge theory with eight flavours, and SU(3) gauge theory with twelve flavours. These two theories may be very close to the lower ends of the conformal windows for the SU(2) and SU(3) gauge groups, respectively, when only the fundamental-representation fermions are present. For the SU(2) theory with eight flavours, we report our investigation for...Go to contribution page
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Sara Tรคhtinen (University of Helsinki, Helsinki Institute of Physics)15/07/2015, 14:20Physics Beyond the Standard ModelTalkIt is expected that SU(2) gauge theory with N_f fundamental fermions has an infrared fixed point when N_f is between ~6 and 11. We study the hadron spectrum and scale setting in SU(2) gauge field theory with N_f=2,4,6 using hypercubic stout smeared Wilson-clover (HEX) action. The case N_f=2 is QCD-like, whereas N_f=6 is close to the lower edge of the conformal window. In our study length...Go to contribution page
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Mr Viljami Leino (University of Helsinki)15/07/2015, 14:40Physics Beyond the Standard ModelTalkSU(2) with Nf=8 flavors of fundamental fermions is expected to feature an infrared fixed point (IRFP). We measure the evolution of the coupling constant with Schrรถdinger functional boundary conditions and gradient flow, using HEX-smeared Wilson-clover action. We observe clear evidence for a fixed point, qualitatively compatible with perturbative results.Go to contribution page
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Dr Georg Bergner (ITP AEC University of Bern)15/07/2015, 15:00Physics Beyond the Standard ModelTalkIn this talk I will present our newest results from the lattice simulation of SU(2) adjoint QCD with two Dirac flavours, also known as minimal walking technicolour. These results include the mass spectrum of the theory, in particular mesonic states with disconnected contributions and a specific spin half fermion-gluon state of the theory. I will discuss the results in comparison with SU(2)...Go to contribution page
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Dr Jarno Rantaharju (CP3-Origins)15/07/2015, 15:20Physics Beyond the Standard ModelTalkWe present a study of a chirally symmetric model of four fermion interactions, the Nambu Jona-Lasinio model, on the lattice with Wilson fermions. Four fermion interactions are a necessary part of many models of beyond Standard Model physics. In particular, they can couple the Standard Model fermions to a strongly interacting Higgs sector. In technicolor models they may cause spontaneous chiral...Go to contribution page
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Mr Oscar Akerlund (ETH Zurich)15/07/2015, 16:30Physics Beyond the Standard ModelTalkWe study generic effects of Beyond the Standard Model physics on the Standard Model Higgs sector. Specifically we investigate the effects of higher order operators in the Higgs potential in the Higgs-Yukawa and gauge-Higgs sectors separately. Our main result is the dependence of the critical endpoint of the Electroweak finite temperature phase transition on the scale of new physics.Go to contribution page
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David Y. -J. Chu (Department of Electrophysics, National Chaio Tung University)15/07/2015, 16:50Physics Beyond the Standard ModelTalkWe consider a chirally-invariant Higgs-Yukawa model as a limiting case of the Standard Model (SM) and investigate the model using lattice simulation. We present result of the study of the model near the mean-field using Renormalisation Group (RG) improved finite-size scalling. We derived formulae for such scaling behaviour by including the contribuations of the leading logarithms. Results for...Go to contribution page
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Dr Graham Moir (Bergische Universitรคt Wuppertal)15/07/2015, 17:10Physics Beyond the Standard ModelTalkWe study the phase diagram and mass spectrum of an $SU(2)$ Gauge-Higgs Unification scenario on a five-dimensional orbifold. This theory exhibits spontaneous symmetry breaking, and we observe that a newly discovered phase transition plays an important role in the ability of the theory to produce a standard model-like spectrum. We comment on dimensional reduction and take first steps towards...Go to contribution page
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Ms Eliana Lambrou (The University of Edinburgh)15/07/2015, 17:30Physics Beyond the Standard ModelTalkThe anisotropic five-dimensional SU(2) lattice gauge theory in a flat space-time background has a rich phase diagram that has been investigated extensively using various techniques. The objective is to understand whether a layered phase exists that could support a four-dimensional brane in the continuum limit, but the results to date provide no evidence for this. We present new results,...Go to contribution page
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Prof. Kari Rummukainen (University of Helsinki)15/07/2015, 17:50Physics Beyond the Standard ModelTalkFuture space-based gravitational wave detectors, e.g. the eLISA satellite constellation scheduled for launch in 2034, can potentially observe primordial gravitational radiation, opening a new window to the early Universe. Gravitational radiation can be generated in first order phase transitions, for example the electroweak transition in some extensions of the Standard Model. In order to...Go to contribution page
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Dr Vincent Drach (CP3 Origins - University of Southern Denmark)16/07/2015, 08:30Physics Beyond the Standard ModelTalkWe present a non perturbative study of SU(2) gauge theory with two fundamental Dirac flavours. We discuss how the model can be used as a template for composite Dark Matter (DM). We estimate two types of interactions of the DM candidate with the Standard Model : the interaction through Higgs exchange and the interaction through photon exchange computing the electric polarizability of the DM...Go to contribution page
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Dr Enrico Rinaldi (Lawrence Livermore National Laboratory)16/07/2015, 08:50Physics Beyond the Standard ModelTalkThe Stealth Dark Matter model contains a candidate composite dark matter particle which appears as a bosonic neutral baryon of a new strongly coupled sector. The elementary constituents of this composite state carry electroweak charges. This construction provides a mechanism to naturally reduce the strength of dark matter interactions with standard model particles. However such interactions...Go to contribution page
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Dr Evan Berkowitz (Lawrence Livermore National Laboratory)16/07/2015, 09:10Physics Beyond the Standard ModelTalkThe Strong CP Problem can be resolved by introducing an additional global symmetry known as Peccei-Quinn symmetry. Once PQ symmetry is broken the associated particle, the QCD axion, is a plausible dark matter candidate. Calculating the cosmological energy density of the axion requires nonperturbative QCD input---the high-temperature topological susceptibility. I will show results from a...Go to contribution page
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Andrea Shindler (Forschungszentrum Jรผlich)16/07/2015, 09:30Physics Beyond the Standard ModelTalkThe nucleon EDM receives potential contributions from fermionic and gluonic local operators representing the effective interactions from BSM physics. We have recently proposed to use the gradient flow to calculate the QCD component of these key BSM matrix elements. I present an update of the results we have obtained.Go to contribution page
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Dr Tanmoy Bhattacharya (Los Alamos National Laboratory)16/07/2015, 09:50Physics Beyond the Standard ModelTalkThe presentation will discuss the connection between RI-SMOM and MSbar schemes for the quark chromo EDM operators. A preliminary study of the signal in the matrix element of neutron EDM using clover quarks on an HISQ ensemble will also be described.Go to contribution page
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Mr Stefano Piemonte (WWU Muenster)18/07/2015, 09:00Physics Beyond the Standard ModelTalkOwing to confinement, the fundamental particles of N=1 Supersymmetric Yang-Mills (SYM) theory, gluons and gluinos, appear only in colourless bound states at zero temperature. Compactifying one space-time dimension with periodic boundary conditions for fermions preserves supersymmetry, and confinement is predicted to persist independently of the length of the compactified dimension. This...Go to contribution page
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Dr pietro giudice (muenster university)18/07/2015, 09:20Physics Beyond the Standard ModelTalkThe spectrum of N=1 supersymmetric Yang-Mills theory, calculated on the lattice, is presented. The masses have been determined on three different lattice spacings and extrapolated towards vanishing gluino mass. We present the extrapolation to the continuum limit which is consistent with the formation of degenerate supermultiplets.Go to contribution page
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Dr Urs Wenger (Albert Einstein Center for fundamental physics)18/07/2015, 09:40Physics Beyond the Standard ModelTalkThe fermion loop formulation naturally separates partition functions into their canonical sectors. Here we discuss various strategies to make use of this for supersymmetric SU(N) Yang-Mills quantum mechanics obtained from dimensional reduction in various dimensions and present numerical results for the separate canonical sectors with fixed fermion numbers. We comment on potential problems due...Go to contribution page
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David Schaich (Syracuse University)18/07/2015, 10:00Physics Beyond the Standard ModelTalkI will present results from numerical studies of maximally supersymmetric Yang--Mills theory, using a new improved lattice action. I will also summarize the improvement procedure, which modifies the moduli equations in order to lift U(1) flat directions without violating the exact supersymmetry preserved at non-zero lattice spacing by the lattice formulation. The resulting improved action...Go to contribution page
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Mr Yuta Ito (SOKENDAI)18/07/2015, 10:20Physics Beyond the Standard ModelTalkThe type IIB matrix model is conjectured to be a nonperturbative formulation of superstring theory.In 2011, the Lorentzian version of the model was studied for the first time by Monte Carlo simulation, and it was shown that (3+1)D expanding universe emerges from (9+1)D space-time predicted by superstring theory. Recently, a simplified model that describes the early time behaviors of the...Go to contribution page
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Dr Valentina Forini (Humboldt University Berlin)18/07/2015, 10:40Physics Beyond the Standard ModelTalkA possible discretization of the Green-Schwarz string in AdS5xS5 background is discussed and applied to the numerical study of the so-called cusp anomaly f(g). The latter, a pure function of the coupling g, when studied assuming the integrability of the underlying model, is an example of non-trivial interpolation smoothly connecting weak and strong coupling regimes and testing the AdS/CFT...Go to contribution page