118565688
Superembedding Formalism and Supertwistors
We establish a correspondence between superembedding and supertwistor methods for constructing 4D N = 1 SCFT correlation functions by deriving a simple relation between tensors used in the two methods. Our discussion applies equally to 4D CFTs by simply reducing all formulas to the N = 0 case.
118791578
Superembedding Methods for Current Superfields
We extend the superembedding formalism for 4D N=1 superconformal field theory (SCFT) to the case of fields in arbitrary representations of the superconformal group SU(2,2|1). As applications we obtain manifestly superconformally covariant expressions for two- and three-point functions involving conserved currents, e.g. the supercurrent multiplet or global symmetry current superfields. The embedding space results are presented in a compact form by employing an index-free formalism. Our expressions are consistent with the literature, but the manifestly covariant forms of correlators presented here are new.
118698107
Electroweak corrections from triplet scalars
We compute the electroweak S and T parameters induced by SU(2)_L triplet scalars up to one-loop order. We consider the most general renormalizable potential for a triplet and the Standard Model Higgs doublet. Our calculation is performed by integrating out the triplet at the one-loop level and also includes the one-loop renormalization group running. Effective field theory framework allows us to work in the phase with unbroken SU(2)_L x U(1)_Y symmetry. Both S and T parameters exhibit decoupling when all dimensionful parameters are large while keeping dimensionless ratios fixed. We use bounds on S and T to constrain the triplet mass and couplings.
118923911
Gravitomagnetic monopole derivable from Dirac theory
Based on the mathematical similarity between the linearized theory of gravitation and electrodynamics, we investigate a new scenario for Einstein equations. It shows that making the equations more symmetric allows us to introduce the concept of gravitomagnetic monopoles and express them in Dirac form. Accordingly, a generalized Dirac condition is presented, which can be treated as a weak limitation on massive charges.
119692657
Regarding the scalar mesons
Based on the main assumption that the D{sub sJ}(2860) belongs to the 2{sup 3}P{sub 0} qq multiplet, the masses of the scalar meson nonet are estimated in the framework of the relativistic independent quark model, Regge phenomenology, and meson-meson mixing. We suggest that the a{sub 0}(1005), K{sub 0}*(1062), f{sub 0}(1103), and f{sub 0}(564) constitute the ground scalar meson nonet; it is supposed that these states would likely correspond to the observed states a{sub 0}(980), {kappa}(900), f{sub 0}(980), and f{sub 0}(600)/{sigma}, respectively. Also a{sub 0}(1516), K{sub 0}*(1669), f{sub 0}(1788), and f{sub 0}(1284) constitute the first radial scalar meson nonet, it is supposed that these states would likely correspond to the observed states a{sub 0}(1450), K{sub 0}*(1430), f{sub 0}(1710), and f{sub 0}(1370), respectively. The scalar state f{sub 0}(1500) may be a good candidate for the ground scalar glueball. The agreement between the present findings and those given by other different approaches is satisfactory.
16933705
ON THE MIXING OF THE SCALAR MESONS f0(1370), f0(1500) AND f0(1710)
Based on a 3 x 3 mass matrix describing the mixing of the scalar states f(o)(1370), f(o)(1500) and f(o)(1710), the hadronic decays of the three states into two pseudoscalar mesons are investigated. Under the possible assumption concerning the mass level order of the bare states \N] = \u (u) over bar + d (d) over bar]/root2, \S] = \s (s) over bar) and \G) = \gg] in the scalar sector, M-G > M-N > M-S, the implications of some of the observed branching ratios for the glueball-quarkonia content of the three states are studied. Some predictions about the decays of the three states are presented, which can provide stringent consistency checks for our assumption.