We present a five dimensional supersymmetric SO(10) model compactified on an orbifold S/Z2 ×Z ′ 2. The gauge symmetry G422 ≡ SU(4)c×SU(2)L×SU(2)R, realized on one of the fixed points (branes), is spontaneously broken to the MSSM via the higgs mechanism. Employing a flavor U(1) symmetry and suitably extending the ’matter’ sector enables us to understand large mixings in the neutrino sector via a...

We present a five dimensional supersymmetric SO(10) model compactified on an orbifold S/Z2 ×Z ′ 2. The gauge symmetry G422 ≡ SU(4)c×SU(2)L×SU(2)R, realized on one of the fixed points (branes), is spontaneously broken to the MSSM via the higgs mechanism. Employing a flavor U(1) symmetry and suitably extending the ’matter’ sector enables us to understand large mixings in the neutrino sector via a...

We present a five dimensional supersymmetric SO(10) model compactified on an orbifold S/Z2 ×Z ′ 2. The gauge symmetry G422 ≡ SU(4)c×SU(2)L×SU(2)R, realized on one of the fixed points (branes), is spontaneously broken to the MSSM via the higgs mechanism. Employing a flavor U(1) symmetry and suitably extending the ’matter’ sector enables us to understand large mixings in the neutrino sector via a...

After a brief historical comment on the study of BRS(or BRST) symmetry , we discuss the quantization of gauge theories with Gribov copies. A path integral with BRST symmetry can be formulated by summing the Gribov-type copies in a very specific way if the functional correspondence between τ and the gauge parameter ω defined by τ(x) = f(Aμ(x)) is “globally single valued”, where f(A ω μ(x)) = 0 s...

Two multinuclear complexes synthesized from Cu(NO3)2 and 6,6'-di-hydroxy-bipyridine (dhbp) exhibit bridging nitrate and hydroxide ligands. The dinuclear complex (6,6'-di-hydroxy-bipyridine-2κ(2) N,N')[μ-6-(6-hy-droxy-pyridin-2-yl)pyridin-2-olato-1:2κ(3) N,N':O (2)](μ-hydroxido-1:2κ(2) O:O')(μ-nitrato-1:2κ(2) O:O')(nitrato-1κO)dicopper(II), [Cu2(C10H7N2O2)(OH)(NO3)2(C10H8N2O2)] or [Cu(6-OH-6'-O-...

It is now well-known that (2)H solid-state NMR techniques can bring a better understanding of the interaction of deuterium with metal atoms in organometallic mononuclear complexes, clusters or nanoparticles. In that context, we have recently obtained experimental quadrupolar coupling constants and asymmetry parameters characteristic of deuterium atoms involved in various bonding situations in r...

We evaluate the radiative and hadronic decay rates of the D mesons using the Heavy Quark Effective Theory and the Vector Meson Dominance hypothesis. We also estimate the width of the B electromagnetic transitions and the radiative decays of positive parity J = 0, 1 charmed mesons. e-mail address: [email protected] In this letter we wish to show that the heavy quark and chiral SU(3)L × SU(3...

In the minimal supersymmetric Standard Model with seesaw neutrino masses we show how R–parity can emerge naturally as a discrete gauge symmetry. The same discrete symmetry explains the smallness of the μ–term (the Higgsino mass parameter) via the Giudice–Masiero mechanism. The discrete gauge anomalies are cancelled by a discrete version of the Green–Schwarz mechanism. The simplest symmetry grou...

where a†iσ , aiσ are fermionic operators for electrons of spin σ ∈ {↑, ↓} at site i of the lattice, niσ ≡ a † iσaiσ, and 〈i, j〉 denotes nearest neighbor sites i 6= j. The model is given in grand canonical form; μ fixes the average number 〈 ∑ i,σ niσ〉 of electrons. The first term is a local on-site interaction; for u > 0 it describes a repulsive Coulomb interaction, for u < 0 it yields an effect...

Renormalization in quantum statistics in the presence of a charge associated to a spontaneously broken symmetry is discussed for the scalar field model. In contrast with the case of non-broken symmetry, the renormalization mass counter term δm depends on the chemical potential. We argue that this is connected to the ill-defined character of the charge operator. 1 Permanent address: Grupo de Fis...