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
Dr
Hiroshi Ohki
(RIKEN)
14/07/2015, 14:00
Physics Beyond the Standard Model
Talk
In 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...
Dr
Ed Bennett
(Swansea University)
14/07/2015, 14:20
Physics Beyond the Standard Model
Talk
SU(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...
Dr
Masafumi Kurachi
(KEK)
14/07/2015, 14:40
Physics Beyond the Standard Model
Talk
LatKMI 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, we’ll show preliminary results of flavor-singlet scalar bound state and give...
Prof.
Claudio Rebbi
(Boston University)
14/07/2015, 15:00
Physics Beyond the Standard Model
Talk
After 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...
Evan Weinberg
(Boston University Department of Physics)
14/07/2015, 15:20
Physics Beyond the Standard Model
Talk
We 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...
Dr
YU NAKAYAMA
(Caltech)
14/07/2015, 15:40
Physics Beyond the Standard Model
Talk
We 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...
Prof.
Julius Kuti
(U.C. San Diego)
14/07/2015, 16:30
Physics Beyond the Standard Model
Talk
A 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...
Mr
wong chik him
(university of wuppertal)
14/07/2015, 16:50
Physics Beyond the Standard Model
Talk
The 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.
Mr
santanu Mondal
(Eötvös Loránd University)
14/07/2015, 17:10
Physics Beyond the Standard Model
Talk
We 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.
Daniel Nogradi
(Eotvos University)
14/07/2015, 17:30
Physics Beyond the Standard Model
Talk
The 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...
Mr
Martin Hansen
(CP3-Origins, University of Southern Denmark)
14/07/2015, 17:50
Physics Beyond the Standard Model
Talk
We 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...
183.
Lattice study for conformal windows of SU(2) and SU(3) gauge theories with fundamental fermions
Prof.
C.-J. David Lin
(National Chiao-Tung University)
15/07/2015, 14:00
Physics Beyond the Standard Model
Talk
We 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...
Sara Tähtinen
(University of Helsinki, Helsinki Institute of Physics)
15/07/2015, 14:20
Physics Beyond the Standard Model
Talk
It 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...
Mr
Viljami Leino
(University of Helsinki)
15/07/2015, 14:40
Physics Beyond the Standard Model
Talk
SU(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 Schrödinger 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.
Dr
Georg Bergner
(ITP AEC University of Bern)
15/07/2015, 15:00
Physics Beyond the Standard Model
Talk
In 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)...
Dr
Jarno Rantaharju
(CP3-Origins)
15/07/2015, 15:20
Physics Beyond the Standard Model
Talk
We 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...
Mr
Oscar Akerlund
(ETH Zurich)
15/07/2015, 16:30
Physics Beyond the Standard Model
Talk
We 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.
David Y. -J. Chu
(Department of Electrophysics, National Chaio Tung University)
15/07/2015, 16:50
Physics Beyond the Standard Model
Talk
We 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...
Dr
Graham Moir
(Bergische Universität Wuppertal)
15/07/2015, 17:10
Physics Beyond the Standard Model
Talk
We 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...
Ms
Eliana Lambrou
(The University of Edinburgh)
15/07/2015, 17:30
Physics Beyond the Standard Model
Talk
The 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,...
Prof.
Kari Rummukainen
(University of Helsinki)
15/07/2015, 17:50
Physics Beyond the Standard Model
Talk
Future 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...
Dr
Vincent Drach
(CP3 Origins - University of Southern Denmark)
16/07/2015, 08:30
Physics Beyond the Standard Model
Talk
We 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...
Dr
Enrico Rinaldi
(Lawrence Livermore National Laboratory)
16/07/2015, 08:50
Physics Beyond the Standard Model
Talk
The 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...
Dr
Evan Berkowitz
(Lawrence Livermore National Laboratory)
16/07/2015, 09:10
Physics Beyond the Standard Model
Talk
The 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...
Andrea Shindler
(Forschungszentrum Jülich)
16/07/2015, 09:30
Physics Beyond the Standard Model
Talk
The 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.
Dr
Tanmoy Bhattacharya
(Los Alamos National Laboratory)
16/07/2015, 09:50
Physics Beyond the Standard Model
Talk
The 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.
Mr
Stefano Piemonte
(WWU Muenster)
18/07/2015, 09:00
Physics Beyond the Standard Model
Talk
Owing 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...
Dr
pietro giudice
(muenster university)
18/07/2015, 09:20
Physics Beyond the Standard Model
Talk
The 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.
Dr
Urs Wenger
(Albert Einstein Center for fundamental physics)
18/07/2015, 09:40
Physics Beyond the Standard Model
Talk
The 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...
David Schaich
(Syracuse University)
18/07/2015, 10:00
Physics Beyond the Standard Model
Talk
I 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...
Mr
Yuta Ito
(SOKENDAI)
18/07/2015, 10:20
Physics Beyond the Standard Model
Talk
The 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...
Dr
Valentina Forini
(Humboldt University Berlin)
18/07/2015, 10:40
Physics Beyond the Standard Model
Talk
A 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...
