We discuss singlet extensions of the MSSM with ZR 4 symmetry. We show that holomorphic zeros can avoid a potentially large coefficient of the term linear in the singlet. The emerging model has both an effective μ term and a supersymmetric mass term for the singlet μ N which are controlled by the gravitino mass. The μ term turns out to be suppressed against μ N by about one or two orders of magn...

The three-dimensional four-fermion model with a Z2 chiral symmetry and N = 4 fermion species in the system is investigated numerically at non-zero temparature T and chemical potential μ. The phase diagram in the (T, μ) plane is mapped out quantitatively. A detailed finite size scaling analysis shows that the T = 0, μ 6= 0 chiral phase transition is first order, whereas the T 6= 0, μ 6= 0 transi...

In the crystal structure of the binuclear title complex, [Co(N(3))(2)(C(12)H(8)N(2))](n), each Co(II) cation is coordinated by two N atoms from one chelating 1,10-phenanthroline ligand and four azide ligands in a slightly distorted octa-hedral coordination. The two Co(II) cations of the binuclear complex are related by an inversion centre and are bridged by two symmetry-related azide ligands in...

A quantitative analysis of aμ ≡ 12(g− 2)μ within the framework of Supergravity Grand Unification and radiative breaking of the electro-weak symmetry is given. It is found that a μ is dominated by the chiral interference term from the light chargino exchange, and that this term carries a signature which correlates strongly with the sign of μ. Thus as a rule a μ > 0 for μ > 0 and a SUSY μ < 0 for...

In a confining, renormalisable, Dyson-Schwinger equation model of two-flavour QCD we explore the chemical-potential dependence of the dressed-quark propagator, which provides a means of determining the behaviour of the chiral and deconfinement order parameters, and low-energy pion observables. We find coincident, first order deconfinement and chiral symmetry restoration transitions at μc = 375M...

We study the implications of a large νμ-ντ mixing angle on flavour changing transitions of quarks and leptons in supersymmetric extensions of the standard model. Two patterns of supersymmetry breaking are considered, models with modular invariance and the standard scenario of universal soft breaking terms at the GUT scale. The analysis is performed for two symmetry groups G ⊗ U(1)F , with G = S...

In the title compound, [CdK(2)(NCSe)(4)(H(2)O)(2)](n), the cadmium(II) cation is situated on a twofold rotation axis and is coordinated in a slightly distorted tetra-hedral geometry by two symmetry-related μ-1,1,1,3 and two-symmetry related μ-1,1,3,3 bridging seleno-cyanate anions, all of which are Se bonded. These bridging seleno-cyanate anions are further coordinated to two symmetry-related p...

The μ parameter is calculated in supergravity models possessing the U(1)A× U(1)R symmetry. In one natural model without a free mass parameter below the Planck scale, the symmetry breaking scale is identified as the hidden sector squark condensation scale. [email protected] 1

We propose a supersymmetric extension of the standard model which does not have a “μ” supersymmetric Higgs mass parameter. The matter content of the MSSM is extended with three additional chiral superfields: one singlet, an SU(2) triplet and a color octet, and an approximate U(1)R symmetry naturally guarantees that tanβ is large, explaining the top/bottom quark mass hierarchy. Unlike in the MSS...