Measurement of the Decay B- --> D*0 e- nubar

TL;DR

This study measures the decay rate and form factors of B- -> D*0 e- nubar decays using a large dataset, providing precise values for key parameters relevant to understanding semileptonic B decays.

Contribution

It presents the first detailed measurement of the differential decay rate and form factor parameters for B- -> D*0 e- nubar using the BABAR detector data.

Findings

Measured rho_A1^2 = 1.16 +- 0.06 +- 0.08

Determined F(1)|V_cb| = (35.9 +- 0.6 +- 1.4) x 10^-3

Calculated BF(B- -> D*0 e- nubar) = (5.56 +- 0.08 +- 0.41)%

Abstract

Using 226 million BBbar events recorded on the Upsilon(4S) resonance with the BABAR detector at the SLAC e+e- PEPII storage rings, we reconstruct B- -> D*0 e- nubar decays using the decay chain D*0 -> D0 pi0 and D0 -> K pi. From the dependence of their differential rate on w, the dot product of the four-velocities of B and D*0, and using the form factor description by Caprini et al. with the parameters F(1) and rho_A1^2, we obtain the results rho_A1^2 = 1.16 +- 0.06 +- 0.08, F(1)|V_cb| = (35.9 +- 0.6 +- 1.4) 10^-3, and BF(B- -> D*0 e- nubar) = (5.56 +- 0.08 +- 0.41)%.