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We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrixelement |V_{cb}| and of the parameters rho^2, R_1(1), and R_2(1), which fullycharacterize the form factors for the B0 -> D*- l+ nu_l decay in the frameworkof heavy-quark effective theory. The results, based on a selected sample ofabout 52,800 B0 -> D*- l+ nu_l decays, recorded by the BaBar detector, arerho2=1.157+-0.094+-0.027, R_1(1)=1.327+-0.131+-0.043,R_2(1)=0.859+-0.077+-0.021, and F(1)|V_cb|=(34.7+-0.4+-1.0)x10^-3. The firsterror is the statistical and the second is the systematic uncertainty.Combining these measurements with the previous BaBar measurement of the formfactors, which employs a different fit technique on a partial sample of thedata, we improve the statistical precision of the result,rho2=1.191+-0.048+-0.028, R_1(1)=1.429+-0.061+-0.044,R_2(1)=0.827+-0.038+-0.022, and F(1)|V_cb| = (34.4+-0.3+-1.1)x10^-3. Usinglattice calculations for the axial form factor $\mathcal{F}(1)$, we extract|V_cb| =(37.4+-0.3+-1.2+1.2-1.4)x10^-3, where the third error is due to theuncertainty in F(1). We also present a measurement of the exclusive branchingfraction, B = (4.69+-0.04+-0.34)%.

Determination of the Form Factors for the Decay B0 -> D*- l+ nu_l and of the CKM Matrix Element |V_cb|