Weak Decays in the light--front Quark Model
| Autor: | Q. P. Xu, Humphrey K. K. Tung, Patrick J. O'Donnell |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1995 |
| Předmět: |
Quark
Semileptonic decay Physics Particle physics 010308 nuclear & particles physics Computer Science::Information Retrieval Quark model High Energy Physics::Phenomenology Zero (complex analysis) FOS: Physical sciences 01 natural sciences Pseudoscalar meson High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Light cone 0103 physical sciences B meson Vector meson 010306 general physics |
| Popis: | We study the form factors of heavy--to--heavy and heavy--to--light weak decays using the light--front relativistic quark model. For the heavy--to--heavy $B \ra D^{(\ast)}$ semileptonic decays we calculate the corresponding Isgur--Wise function for the whole kinematic region. For the heavy--to--light $B\ra P$ and $B\ra V$ semileptonic decays we calculate the form factors at $q^2 = 0$; in particular, we have derived the dependence of the form factors on the $b$--quark mass in the $m_b \ra \infty$ limit. This dependence can not be produced by extrapolating the scaling behavior of the form factors at $q^2_{max}$ using the single--pole assumption. This shows that the $q^2$ dependence of the form factors in regions far away from the zero--recoil could be much more complicated than that predicted by the single--pole assumption. 24 pages, Latex, Postscript figure included at the end |
| Databáze: | OpenAIRE |
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