Measurements of the $B \to D^*$ Form Factors Using the Decay $\bar{B}^0 \to D^{*+} e^- \bar{\nu}_e$ [report]

M Gill
2006 unpublished
We measure the dependence ofB 0 →D * + e − νe on the decay angles and momentum transfer. The data sample consists of ∼ 86 × 10 6 BB-pairs accumulated on the Υ (4S) resonance by the BABAR detector at the asymmetric e + e − collider PEP-II. We specify the three form factors by two ratios R1 and R2, and by a single parameter ρ 2 characterizing the polynomial representing hA 1 , the function which describes the momentum-transfer dependence of the form factor A1. We determine R1, R2, and ρ 2 using
more » ... R2, and ρ 2 using an unbinned maximum likelihood fit to the full decay distribution. The results are R1 = 1.396±0.060±0.035±0.027, R2 = 0.885±0.040±0.022±0.013, and ρ 2 = 1.145±0.059±0.030±0.035. The stated uncertainties are the statistical from the data, statistical from the size of the Monte Carlo sample and the systematic uncertainty, respectively. In addition, based on this measurement, we give an updated value for the CKM matrix element |V cb |.
doi:10.2172/876595 fatcat:phv56iwhhzftbkael2glfxkbde