Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Hsu, S. D. H."'
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
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:
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
Autor:
Hsu, S. D. H., Sikivie, Pierre
Publikováno v:
Phys.Rev. D49 (1994) 4951-4953
The exchange of two massless neutrinos gives rise to a long range force which couples to weakly charged matter. As has been noted previously in the literature, the potential for this force is $\VN \propto G_{F}^2 / r^5$ with monopole-monople, spin-sp
Externí odkaz:
http://arxiv.org/abs/hep-ph/9211301
Publikováno v:
Phys.Rev.D46:5352-5359,1992
We investigate the stability of the electroweak Z-string at high temperatures. Our results show that while finite temperature corrections can improve the stability of the Z-string, their effect is not strong enough to stabilize the Z-string in the st
Externí odkaz:
http://arxiv.org/abs/hep-ph/9208245