Exclusive decays of heavy and light mesons
| Autor: | Patrick J. O'Donnell, Humphrey K. K. Tung |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Semileptonic decay
Physics Particle physics Meson Branching fraction Computer Science::Information Retrieval High Energy Physics::Phenomenology Nuclear Theory Order (ring theory) Elementary particle Nuclear physics Particle decay High Energy Physics::Experiment B meson Connection (algebraic framework) |
| Zdroj: | Physical Review D. 44:741-750 |
| ISSN: | 0556-2821 |
| Popis: | In the exclusive decay of the {ital B} meson into a {ital K}{sup *} and a photon, the large recoil momentum creates a difficulty in making a connection between the quark level calculations and the meson states. In the quark model, depending on how the recoil momentum is handled, this can lead to differences of a factor of about 5 in the branching ratio. In order to explore this problem, we look at some other meson processes where there exist some experimental data. For the {pi} form factor we show that, by imposing current conservation together with relativistic meson and spinor normalizations within the quark model, it is possible to remove a parameter {kappa} which had previously been introduced to obtain agreement with the form-factor data. The data on the decay {omega}{r arrow}{pi}{sup 0}{mu}{sup +}{mu}{sup {minus}} and {omega}{r arrow}{pi}{sup 0}{gamma} also show the importance of retaining relativistic meson and spinor normalizations; however, we do not resolve the recoil problem. For the exclusive decays {ital B}{r arrow}{ital K}{sup *}{gamma} and {ital B}{r arrow}{ital K}{sup *}{ital e+}{ital e{minus}} we show the extent to which the heavy-quark symmetries determine these decays, even in regions of large recoil. |
| Databáze: | OpenAIRE |
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