/ 98 08 09 6 v 2 1 9 O ct 1 99 9 Wakimoto realizations of current and exchange algebras ∗

ar X iv : h ep - t h / 98 08 09 6 v 1 1 7 A ug 1 99 8 Wakimoto realizations of current and exchange algebras ∗

Working at the level of Poisson brackets, we describe the extension of the generalized Wakimoto realization of a simple Lie algebra valued current, J, to a corresponding realization of a group valued chiral primary field, b, that has diagonal monodromy and satisfies Kb ′ = Jb. The chiral WZNW field b is subject to a monodromy dependent exchange algebra, whose derivation is reviewed, too.

ar X iv : h ep - t h / 95 10 23 9 v 1 3 1 O ct 1 99 5 On the W - algebra in the Calegero - Sutherland model using the Exchange operators

We study the W ∞ algebra in the Calegero-Sutherland model using the exchange operators. The presence of all the sub-algebras of W ∞ is shown in this model. A simplified proof for this algebra, in the symmetric ordered basics, is given. It is pointed out that the algebra contains in general, nonlinear terms.

ar X iv : h ep - p h / 98 08 36 9 v 2 1 6 O ct 1 99 8 Radiative decays of D mesons

The short-distance contribution due to the c → uγ penguin as well as long-distance contributions are considered in an analysis of D → V γ decays, the latter being dominant. The matrix elements for nine D → V γ transitions are calculated using a hybrid model which combines heavy quark effective theory and the chiral Lagrangian. We present the expected range of the branching ratios for these deca...

ep - t h / 98 08 17 6 v 3 2 3 A ug 1 99 9 Goldstone and Pseudo - Goldstone Bosons in Nuclear , Particle and Condensed - Matter Physics

ar X iv : h ep - p h / 98 09 55 1 v 2 2 O ct 1 99 8 Uses of QCD sumrules ( QCDSR ) from different points of view

We support the idea that the baryon, B with mass MB, couples to its current with a coupling λB ∼ 0.71 M 6 B from an analysis of magnetic moment sum rules. And we find a sum rule among the experimental magnetic moments which is independent of the parameters of QCDSR.