118963023
Strongly interacting Higgs sector in the minimal Standard Model
Abstract The triviality Higgs mass bound is studied with a higher derivative regulating in the spontaneously broken phase of the four dimensional O(4) symmetric scalar fiel-theory with quartic self-interaction. The phase diagram of the O(4) model is determined in a Monte Carlo simulation which interpolates between the hypercubic lattice regulator and the higher derivative regulator in continuum space-time. The same method can be used to calculate the Higgs mass bound in continuum space-time. In a large- N analysis, when compared with a hypercubic lattice, we find a relative increase in the triviality bound of the higher derivative regulator suggesting a strongly interacting Higgs sector in the TeV region with negligible dependence on regulator parameters. When the higher derivative regulator mass is brought close to the Higgs mass the model requires a more elaborate analysis of complex ghost states in scattering amplitudes.
6175444
TUNING THE TADPOLE IMPROVED CLOVER WILSON ACTION ON COARSE ANISOTROPIC LATTICES
Wilson quark action, with tadpole improved clover term added, is studied on coarse anisotropic lattices. The bare velocity of light parameter in this action is determined nonperturbatively using the pseudo-scalar and vector meson dispersion relations for various values of the gauge coupling β and bare quark mass parameter κ.
118639447
Pure gauge glueballs at finite temperature
Pure gauge glueballs at finite temperature are investigated in a large temperature range from 0:3Tc to 1:9Tc on anisotropic lattices. Optimized glueball operators are used to obtain better signals. It is found in all 20 symmetry channels that the pole masses MG of glueballs remain almost constants when the temperature approaches the critical temperature Tc from below, and start to reduce gradually with the temperature going above Tc. The glueball correlators in 0 ++ , 0 i+ , and 2 ++ channels, are also analyzed based on the Breit-Wigner ansatz by assuming a thermal width Γ to the pole mass ω0. While ω0's are insensitive to T in the whole temperature range, Γ's exhibit distinct behavior below and above Tc: They are only few percents of ω0 when T Tc and reach values of roughly Γ » ω0=2 at T … 1:9Tc.
121608815
Mean-field calculations for the three-dimensional Holstein model
The electron-phonon Holstein model is studied in three spatial dimensions. It is argued that this model can be used to account for major features of the high-Tc BaPb1-xBixO3 and BaxK1-xBiO3 systems. Mean-field calculations are performed via a path integral representation of the model. Charge-density-wave order parameters and transition temperatures are obtained.
119942970
LATTICE STUDY OF SCALAR AND TENSOR GLUEBALLS
15925356
A heavy Higgs particle in the TeV mass range
Abstract The first simulation results are presented on Higgs mass calculations in the spontaneously broken phase of the Higgs sector in the minimal Standard Model with higher derivative regulator. A heavy Higgs particle is found in the TeV mass range in the presence of a complex conjugate ghost pair at higher energies. The ghost pair evades easy experimental detection and a nonperturbative reinterpretation of the triviality Higgs mass bound becomes necessary.
18945028
S 1 -fixed-points in hyper-Quot-schemes and an exact mirror formula for flag manifolds from the extended mirror principle diagram
In the series of work [L-L-Y1, III: Sec. 5.4] on mirror principle, two of the current authors (K.L. and S.-T.Y.) with Bong H. Lian developed a method to compute the integral R X τ � e H·t ∩ 1d for a flag manifold X = Fl r1, ..., rI(C n ) via an extended mirror principle diagram. This integral determines the fundamental hypergeometric series HG[1] X (t) and is also related to the computation of the Gromov-Witten invariants (string world-sheet instanton numbers) on X. This method turns the required localization computation on the augmented moduli stack M0,0(CP 1 × X) of stable maps to a localization computation on a hyper-Quot-scheme HQuot(E n ) of inclusion sequences of subsheaves of a trivialized trivial bundle E n of rank n on CP 1 . In this article, the detail of this localization computation on HQuot(E n ) is carried out. The necessary ingredients in the computation, notably, the S 1 -fixed-point components and the distinguished ones E(A;0) in HQuot(E n ), the S 1 -equivariant Euler class of E(A;0) in HQuot(E n ), and a push-forward formula of cohomology classes involved in the problem from the total space of a restrictive flag manifold bundle to its base manifold are given. With these, an exact expression of R X τ � e H·t ∩ 1d is obtained. When X is a Grassmannian manifold, the same route reproduces the known exact expression for HG[1] X (t). For a general flag manifold X, our expression determines HG[1] X (t) implicitly. Remarks on what it suggests for general Hori-Vafa formula are given. Due to the technical necessity, a discussion on the general construction of restrictive flag manifold bundle, its natural embedding in a flag manifold bundle, and the Thom class of this embedding is also given. This work generalizes the result in [L-L-L-Y]. This work gives explicit formulas for mirror principle computations of Calabi-Yau manifolds in flag manifolds.
16420888
MeV tau neutrino in a gauge-mediated supersymmetry breaking model
A supersymmetric model which naturally accommodates MeV tau neutrinos within the framework of gauge-mediated supersymmetry breaking is described. The lepton number violation is originally introduced in the messenger sector of the theory. A large slepton-Higgs mixing mass and a small lepton-higgsino mixing mass are generated at one loop. The scalar tau neutrino has a non-vanishing vacuum expectation value. This results in a non-zero vτ mass which is in the range of 1–10 MeV.
341730
Target-space duality between simple compact Lie groups and Lie algebras under the Hamiltonian formalism: I. Remnants of duality at the classical level
AbstractIt has been suggested that a possible classical remnant of the phenomenon of target-space duality (T-duality) would be the equivalence of the classical string Hamiltonian systems. Given a simple compact Lie groupG with a bi-invariant metric and a generating function Γ suggested in the physics literature, we follow the above line of thought and work out the canonical transformation Φ generated by Γ together with an Ad-invariant metric and a B-field on the associated Lie algebra
$$\mathfrak{g}$$
 ofG so thatG and
$$\mathfrak{g}$$
 form a string target-space dual pair at the classical level under the Hamiltonian formalism. In this article, some general features of this Hamiltonian setting are discussed. We study properties of the canonical transformation Φ including a careful analysis of its domain and image. The geometry of the T-dual structure on
$$\mathfrak{g}$$
 is lightly touched. We leave the task of tracing back the Hamiltonian formalism at the quantum level to the sequel of this paper.
123719799
A SUPERSYMMETRIC MODEL FOR 17 KEV NEUTRINO
A supersymmetric model for accommodating the 17 KeV neutrino is proposed. The rank-two Majorana mass matrix for right-handed neutrinos can be obtained in a natural way. The neutrino spectrum is the same as that in the Glashow's model. The lifetime of the 17 KeV neutrino can satisfy the cosmological constraints.
118375342
Supersymmetric extension of the minimal dark matter model
The minimal dark matter model is given a supersymmetric extension. A super SU(2)(L) quintuplet is introduced with its fermionic neutral component still being the dark matter, and the dark matter mass is about 19.7 TeV. Mass splitting among the quintplet due to supersymrnetry particles is found to be negligibly small compared to the electroweak corrections. Other properties of this supersymmetry model are studied, it has the solutions to the PAMELA and Fermi-LAT anomaly, and the predictions in higher energies need further experimental data to verify them.