$B \to ρ\ell ν_\ell$ Form Factors

The bounds on the form factors for $B \to ρ\ell ν_\ell$ decay are studied. Constrained by lattice data and a constrained conformal mapping, the more informations can be obtained for $A_1(q^2)$ form-factor which dominates the decay rate at large $q^2$. Specifically, we confirm a moderately increasing behavior of this form factor.

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