Light-front zero-mode contribution to the good current in weak transitions

We examine the light-front zero-mode contribution to the good (+) current matrix elements between pseudoscalar and vector mesons. In particular, we discuss the transition form factor f(q2) which has been suspected to have the light-front zero-mode contribution. While the zero-mode contribution in principle depends on the form of the vector meson vertex Γμ= γμ-(PV-2k)μ/D, the form factor f(q2) is found to be free from the zero-mode contribution if the denominator D contains the term proportional to the light-front energy (k-)n with the power n>0. The lack of zero-mode contribution benefits the light-front quark model phenomenology. We present our numerical calculations for the B→ρ transition.