# Extraction of |V_ub| with Reduced Dependence on Shape Functions

## Abstract

Using BABAR measurements of the inclusive electron spectrum in B {yields} X{sub u}e{nu} decays and the inclusive photon spectrum in B {yields} X{sub s}{gamma} decays, we extract the magnitude of the CKM matrix element V{sub ub}. The extraction is based on several theoretical calculations designed to reduce the theoretical uncertainties by exploiting the assumption that the leading shape functions are the same for all b {yields} q transitions (q is a light quark). The current results agree well with the previous analysis, have indeed smaller theoretical errors, but are presently limited by the knowledge of the photon spectrum and the experimental errors on the lepton spectrum.

- Authors:

- Publication Date:

- Research Org.:
- Stanford Linear Accelerator Center (SLAC)

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 900600

- Report Number(s):
- SLAC-PUB-12336

hep-ph/0702072; TRN: US0702344

- DOE Contract Number:
- AC02-76SF00515

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: hep-ph

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRONS; LEPTONS; MATRIX ELEMENTS; PHOTONS; SHAPE; Phenomenology-HEP,HEPEX, HEPPH

### Citation Formats

```
Golubev, Vladimir B., Skovpen, Yuri, I., /Novosibirsk, IYF, Luth, Vera G., and /SLAC.
```*Extraction of |V_ub| with Reduced Dependence on Shape Functions*. United States: N. p., 2007.
Web.

```
Golubev, Vladimir B., Skovpen, Yuri, I., /Novosibirsk, IYF, Luth, Vera G., & /SLAC.
```*Extraction of |V_ub| with Reduced Dependence on Shape Functions*. United States.

```
Golubev, Vladimir B., Skovpen, Yuri, I., /Novosibirsk, IYF, Luth, Vera G., and /SLAC. Tue .
"Extraction of |V_ub| with Reduced Dependence on Shape Functions". United States.
doi:. https://www.osti.gov/servlets/purl/900600.
```

```
@article{osti_900600,
```

title = {Extraction of |V_ub| with Reduced Dependence on Shape Functions},

author = {Golubev, Vladimir B. and Skovpen, Yuri, I. and /Novosibirsk, IYF and Luth, Vera G. and /SLAC},

abstractNote = {Using BABAR measurements of the inclusive electron spectrum in B {yields} X{sub u}e{nu} decays and the inclusive photon spectrum in B {yields} X{sub s}{gamma} decays, we extract the magnitude of the CKM matrix element V{sub ub}. The extraction is based on several theoretical calculations designed to reduce the theoretical uncertainties by exploiting the assumption that the leading shape functions are the same for all b {yields} q transitions (q is a light quark). The current results agree well with the previous analysis, have indeed smaller theoretical errors, but are presently limited by the knowledge of the photon spectrum and the experimental errors on the lepton spectrum.},

doi = {},

journal = {hep-ph},

number = ,

volume = ,

place = {United States},

year = {Tue Mar 06 00:00:00 EST 2007},

month = {Tue Mar 06 00:00:00 EST 2007}

}

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