B-meson distribution amplitude from the B→π form factor
| Autor: | Nils Offen, Thomas Mannel, Alexander Khodjamirian |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Quantum chromodynamics
Physics Nuclear and High Energy Physics Particle physics Meson High Energy Physics::Lattice High Energy Physics::Phenomenology Momentum transfer Form factor (quantum field theory) High Energy Physics - Phenomenology Pion Amplitude High Energy Physics::Experiment B meson Sum rule in quantum mechanics |
| Zdroj: | Physics Letters B. 620:52-60 |
| ISSN: | 0370-2693 |
| Popis: | Employing the light-cone sum rule approach in QCD, we relate the $B$-meson distribution amplitude to the $B\to \pi$ form factor at zero momentum transfer. In leading order, the sum rule is converted into a simple expression for the inverse moment $\lambda_B$ of the distribution amplitude $\phi_{+}^B$. Using as an input the $B\to\pi$ form factor calculated from the light-cone sum rule in terms of pion distribution amplitudes, we obtain an estimate: $\lambda_B =460 \pm 160 $ MeV. We investigate how this result is modified by the $B$-meson three-particle distribution amplitudes. Comment: 11 pages, 1 figure, version to appear in Phys.Lett.B |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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