Zobrazeno 1 - 10
of 239
pro vyhledávání: '"DeGrand, T. A."'
Autor:
Svetitsky, B., Ayyar, V., DeGrand, T., Golterman, M., Hackett, D. C., Jay, W. I., Neil, E. T., Shamir, Y.
We have calculated quantities of interest to a theory of compositeness. The lattice model, approximating the candidate theory, is the SU(4) gauge theory coupled to fermions in two color representations. For the composite Higgs, a current correlator g
Externí odkaz:
http://arxiv.org/abs/1911.10867
The SU(4) gauge theory with two flavors of Dirac fermions in the sextet representation shares features of a candidate for a composite Higgs model. The analogue of the Higgs multiplet of the Standard Model lives in the Goldstone manifold resulting fro
Externí odkaz:
http://arxiv.org/abs/1610.06121
Publikováno v:
Phys. Rev. D 94, 054501 (2016)
We develop methods to calculate the electroweak gauge boson contribution to the effective Higgs potential in the context of composite Higgs models, using lattice gauge theory. The calculation is analogous to that of the electromagnetic mass splitting
Externí odkaz:
http://arxiv.org/abs/1606.02695
Publikováno v:
Phys. Rev. D 90, 014505 (2014)
Baryon masses at varying values of Nc and light quark masses are studied with Lattice QCD and the results are analyzed in a low energy effective theory based on a combined framework of the 1/Nc and Heavy Baryon Chiral Perturbation Theory expansions.
Externí odkaz:
http://arxiv.org/abs/1404.2301
Autor:
DeGrand, T., Schaefer, S.
Some meson correlation functions have a large contribution from the low lying eigenmodes of the Dirac operator. The contribution of these eigenmodes can be averaged over all positions of the source. This can improve the signal in these channels signi
Externí odkaz:
http://arxiv.org/abs/hep-lat/0409056
Autor:
Faccioli, P., DeGrand, T. A.
We present the results of a recent investigation of the short-distance structure of non-perturbative interaction between light quarks. We analyze the connection between topology and the dynamics responsible for the spontaneous breaking of chiral symm
Externí odkaz:
http://arxiv.org/abs/hep-ph/0309288
Autor:
Faccioli, P., DeGrand, T. A.
We report on a recent investigation on the dynamics of light quarks, at intermediate and low energy. By measuring some appropriate correlation functions on the lattice, it is possible to probe the Dirac and flavor structure of the non-perturbative qu
Externí odkaz:
http://arxiv.org/abs/hep-lat/0309129
Autor:
Bernard, C., DeGrand, T., DeTar, C., Gottlieb, Steven, Gregory, E., Hart, A., Hasenfratz, A., Heller, Urs, Hetrick, J., Osborn, J., Sugar, R., Toussaint, D.
Publikováno v:
Phys.Rev.D68:114501,2003
Chiral perturbation theory predicts that in quantum chromodymamics light dynamical quarks suppress the topological (instanton) susceptibility. We investigate this suppression through direct numerical simulation using the Asqtad improved lattice fermi
Externí odkaz:
http://arxiv.org/abs/hep-lat/0308019
Autor:
MILC Collaboration, Bernard, C., Burch, T., DeGrand, T. A., DeTar, C. E., Gottlieb, Steven, Gregory, E., Hasenfratz, A., Heller, U. M., Hetrick, J., Osborn, J., Sugar, R. L., Toussaint, D.
Publikováno v:
Nucl.Phys.Proc.Suppl.119:991-993,2003
As a test of the chiral properties of the improved Asqtad (staggered fermion) action, we have been measuring the topological susceptibility as a function of quark masses for 2 + 1 dynamical flavors. We report preliminary results, which show reasonabl
Externí odkaz:
http://arxiv.org/abs/hep-lat/0209050
Autor:
Bernard, C., Burch, T., DeGrand, T., DeTar, C., Gottlieb, Steven, Gregory, E. B., Heller, U. M., Osborn, J., Sugar, R., Toussaint, D.
Publikováno v:
Nucl.Phys.Proc.Suppl.119:257-259,2003
Preliminary results from simulations with 2+1 dynamical quark flavors at a lattice spacing of 0.09 fm are combined with earlier results at a=0.13 fm. We examine the approach to the continuum limit and investigate the dependence of the pseudoscalar ma
Externí odkaz:
http://arxiv.org/abs/hep-lat/0208041