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

### Description

We measure the dependence of {bar B}{sup 0} {yields} D*{sup +}e{sup -}{bar {nu}}{sub e} on the decay angles and momentum transfer. The data sample consists of {approx} 86 x 10{sup 6} B{bar B}-pairs accumulated on the {Upsilon}(4S) resonance by the BABAR detector at the asymmetric e{sup +}e{sup -} collider PEP-II. We specify the three form factors by two ratios R{sub 1} and R{sub 2}, and by a single parameter {rho}{sup 2} characterizing the polynomial representing h{sub A{sub 1}}, the function which describes the momentum-transfer dependence of the form factor A{sub 1}. We determine R{sub 1}, R{sub 2}, and {rho}{sup 2} ... continued below

### Creation Information

Gill, M February 24, 2006.

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### Description

We measure the dependence of {bar B}{sup 0} {yields} D*{sup +}e{sup -}{bar {nu}}{sub e} on the decay angles and momentum transfer. The data sample consists of {approx} 86 x 10{sup 6} B{bar B}-pairs accumulated on the {Upsilon}(4S) resonance by the BABAR detector at the asymmetric e{sup +}e{sup -} collider PEP-II. We specify the three form factors by two ratios R{sub 1} and R{sub 2}, and by a single parameter {rho}{sup 2} characterizing the polynomial representing h{sub A{sub 1}}, the function which describes the momentum-transfer dependence of the form factor A{sub 1}. We determine R{sub 1}, R{sub 2}, and {rho}{sup 2} using an unbinned maximum likelihood fit to the full decay distribution. The results are R{sub 1} = 1.396 {+-} 0.060 {+-} 0.035 {+-} 0.027, R{sub 2} = 0.885 {+-} 0.040 {+-} 0.022 {+-} 0.013, and {rho}{sup 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{sub cb}|.

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• Report No.: SLAC-PUB-11672
• Grant Number: AC02-76SF00515
• DOI: 10.2172/876595 | External Link
• Office of Scientific & Technical Information Report Number: 876595

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#### Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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### Creation Date

• February 24, 2006

### Added to The UNT Digital Library

• Sept. 21, 2016, 2:29 a.m.

### Description Last Updated

• Nov. 29, 2016, 7:50 p.m.

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Gill, M. Measurements of the $B \to D^*$ Form Factors Using the Decay $\bar{B}^0 \to D^{*+} e^- \bar{\nu}_e$, report, February 24, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc873769/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.