4,095 research outputs found
Toward a more realistic holographic QCD model
By matching the system in type II superstring theory with the Regge
trajectories of vector and axial-vector meson spectra, a possible 5-dimension
metric of a soft-wall model has been determined. The dependence of the
metric parameters on Regge trajectory parameters has been demonstrated. It is
shown that the models defined in brane background for or 4 can be
consistent with experimental data.Comment: 8 pages, proceedings for the YITP International Symposium
"Fundamental Problems in Hot and/or Dense QCD", March 3-6, 2008, Kyoto, Japa
Sigma meson and lowest possible glueball candidate in an extended linear model
We formulate an extended linear model of a quarkonia nonet and a
tetraquark nonet as well as a complex iso-singlet (glueball) field to study the
low-lying scalar meson. Chiral symmetry and symmetry and their
breaking play important role to shape the scalar meson spectrum in our work.
Based on our study we will comment on what may be the mass of the lowest
possible scalar and pseudoscalar glueball states. We will also discuss on what
may be the nature of the sigma or meson.Comment: Contribution to the Proceedings of QCD@work 2012, Lecce, Italy, 18-21
June 2012, 5 pages, 2 figure
CP Violation and Extra Dimensions
It is shown that the new sources of CP violation can be generated in the
models with more than one extra dimensions. In the supersymmetric models on the
space-time , where the radius moduli have auxiliary vacuum
expectation values and the supersymmetry breaking is mediated by the
Kaluza-Klein states of gauge supermultiplets, we analyze the gaugino masses and
trilinear couplings for two scenarios and obtain that there exist relative CP
violating phases among the gaugino masses and trilinear couplings.Comment: Latex, 7 page
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