Zobrazeno 1 - 10
of 187
pro vyhledávání: '"Hsu, S. D."'
Publikováno v:
Phys.Rev.D79:055021,2009
We explore the consequences of an electroweak symmetry breaking sector which exhibits approximately scale invariant dynamics -- i.e., nontrivial fixed point behavior, as in unparticle models. One can think of an unHiggs as a composite Higgs boson wit
Externí odkaz:
http://arxiv.org/abs/0810.2155
Autor:
Hsu, S. D. H., Sannino, F.
Publikováno v:
Phys.Lett. B605 (2005) 369-375
We exhibit a solution to the strong CP problem in which ultraviolet physics renders the QCD theta angle physically unobservable. Our models involve new strong interactions beyond QCD and particles charged under both the new interactions and ordinary
Externí odkaz:
http://arxiv.org/abs/hep-ph/0408319
Publikováno v:
Phys.Lett. B597 (2004) 89-93
We investigate new models of dynamical electroweak symmetry breaking resulting from the condensation of fermions in higher representations of the technicolor group. These models lie close to the conformal window, and are free from the flavor-changing
Externí odkaz:
http://arxiv.org/abs/hep-ph/0406200
Autor:
Hong, D. K., Hsu, S. D. H.
We investigate the positivity of the Euclidean path integral measure for low-energy modes in dense fermionic matter. We show that the sign problem usually associated with fermions is absent if one considers only low-energy degrees of freedom. We desc
Externí odkaz:
http://arxiv.org/abs/hep-ph/0402002
Publikováno v:
Mod.Phys.Lett.A16:1871-1880,2001
We investigate the application of 't Hooft's anomaly matching conditions to gauge theories at finite matter density. We show that the matching conditions constrain the low-energy quasiparticle spectrum associated with possible realizations of global
Externí odkaz:
http://arxiv.org/abs/hep-ph/0006059
Publikováno v:
Phys.Lett. B427 (1998) 300-306
We explore the anomaly induced effective QCD meson potential in the framework of the effective Lagrangian approach. We suggest a decoupling procedure, when a flavored quark becomes massive, which mimics the one employed by Seiberg for supersymmetric
Externí odkaz:
http://arxiv.org/abs/hep-th/9801097
Publikováno v:
Nucl.Phys. B494 (1997) 200-212
We use the chiral Lagrangian to investigate the global properties of the $N$-flavor QCD vacuum as a function of the $\theta$ parameter. In the case of exact quark degeneracy we find evidence for first order phase transitions at $\theta = \pi \cdot ({
Externí odkaz:
http://arxiv.org/abs/hep-ph/9608490
Publikováno v:
Nucl.Phys. B484 (1997) 124-140
We investigate the behavior of softly broken $N=2$ SQCD at non-zero bare theta angle $\theta_0$, using superfield spurions to implement the SUSY breaking. We find a first-order phase transition as $\theta_0$ is varied from zero to $2 \pi$, in agreeme
Externí odkaz:
http://arxiv.org/abs/hep-th/9608135
Publikováno v:
Phys.Lett. B382 (1996) 138-144
Using chiral perturbation theory and the large-$N_c$ expansion, we obtain expressions for the $\eta'$ mass and $\eta - \eta'$ mixing in terms of low-energy chiral Lagrangian parameters. This is accomplished through an intermediate step of `matching'
Externí odkaz:
http://arxiv.org/abs/hep-ph/9605267
Publikováno v:
Phys.Lett. B375 (1996) 262-266
We discuss the global symmetries of the high temperature phase of QCD with $N_f$ massless quarks. We show that the $U(N_f) \times U(N_f)$ symmetries are only violated by operators of dimension $\geq 3 N_f$. For $N_f > 2$ this implies that the thermal
Externí odkaz:
http://arxiv.org/abs/hep-ph/9601361