Heavy Quark Limit of Weak Transition Form Factors in a Light-Cone Constituent Quark Model

摘要

In the light-cone constituent quark model, the vravehnction for A° or At with three quarks is reduced to a wavefunction for the hea.vy-quark-diqua.rk picture by assuming that the two light quarks forming a diquark are in comoving. A heavy quart (or diquark) distribution amplitude is obtained. While form factors of weak transition Ab -ev Acei> are calculated in the Unite mass case, a hadronic-size-dependent form of Isgur-Wise function is obtained in the mq — ∞ limit.