# Comment on Form Factor Shape and Extraction of $|V_{ub}|$ from $B\to\pi l \nu$

### Description

We point out that current experimental data for partial B {yields} {pi}l{nu} branching fractions reduce the theoretical input required for a precise extraction of |V{sub ub}| to the form-factor normalization at a single value of the pion energy. Different parameterizations of the form factor shape leading to this conclusion are compared and the role of dispersive bounds on heavy-to-light form factors is clarified.

14 pages

### Creation Information

Becher, Thomas; /Fermilab; Hill, Richard J. & /SLAC September 14, 2005.

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## What

### Description

We point out that current experimental data for partial B {yields} {pi}l{nu} branching fractions reduce the theoretical input required for a precise extraction of |V{sub ub}| to the form-factor normalization at a single value of the pion energy. Different parameterizations of the form factor shape leading to this conclusion are compared and the role of dispersive bounds on heavy-to-light form factors is clarified.

14 pages

### Source

• Journal Name: Physical Review, B: Condensed Matter; Journal Volume: 633

### Identifier

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• Report No.: SLAC-PUB-11468
• Grant Number: AC02-76SF00515
• Office of Scientific & Technical Information Report Number: 878414

### Collections

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## When

### Creation Date

• September 14, 2005

### Added to The UNT Digital Library

• Sept. 21, 2016, 2:29 a.m.

### Description Last Updated

• Nov. 22, 2016, 10:48 p.m.

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Becher, Thomas; /Fermilab; Hill, Richard J. & /SLAC. Comment on Form Factor Shape and Extraction of $|V_{ub}|$ from $B\to\pi l \nu$, article, September 14, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc877925/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.