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Form factors in the heavy quark and chiral limit: Pole dominance in

1994; Elsevier BV; Volume: 425; Issue: 3 Linguagem: Inglês

10.1016/0550-3213(94)90283-6

1873-1562

Benjamı́n Grinstein, Paul F. Mende,

High-Energy Particle Collisions Research

It is shown that the form factors in the semileptonic decay of ground state heavy mesons to light pseudoscalar mesons are dominated by the vector meson pole at all momentum transfers in two-dimensional planar QCD. First, the general approaches to modeling form factors in terms of quark model, pole dominance or hybrid shapes are reviewed. It is then show that in the chiral limit the form factor is precisely pole-dominated. Corrections to this limit are discussed and, to illustrate the nature of the approximations, an explicit exact calculation of the approach to the limit in a two-dimensional model is given.