Analyticity, shapes of semileptonic form factors, and {bar B}{r_arrow}{pi}l{bar {nu}}
- Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
- Department of Physics, University of Washington, Seattle, Washington 98195 (United States)
We give a pedagogical discussion of the physics underlying dispersion relation-derived parametrizations of form factors describing B{r_arrow}{pi}l{bar {nu}} and B{r_arrow}Dl{bar {nu}}. Moments of the dispersion relations are shown to provide substantially tighter constraints on the f{sub +}(t) form factor describing {bar B}{r_arrow}{pi}l{bar {nu}} than the unweighted dispersion relation alone. Heavy quark spin symmetry relations between the B{r_arrow}{pi}l{bar {nu}} and B{sup {asterisk}}{r_arrow}{pi}l{bar {nu}} form factors enable such constraints to be tightened even further. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Carnegie-Mellon University
- DOE Contract Number:
- FG02-91ER40682
- OSTI ID:
- 531970
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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