Infinite momentum frame calculation of semileptonic heavy {Lambda}{sub b}{r_arrow}{Lambda}{sub c} transitions including HQET improvements
- Institut fuer Physik, Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany)
- Rutherford Appleton Laboratory, Chilton, Didco, OX11 0QX (United Kingdom)
- Fachbereich Physik, Universitaet Wuppertal, D-42097 Wuppertal (Germany)
We calculate the transition form factors that occur in heavy {Lambda}-type baryon semileptonic decays such as, e.g., in {Lambda}{sub b}{r_arrow}{Lambda}{sub c}{sup +}+l{sup {minus}}+{bar {nu}}{sub l}. We use Bauer-Stech-Wirbel-type infinite momentum frame wave functions for the heavy {Lambda}-type baryons which we assume to consist of a heavy quark and a light spin-isospin zero diquark system. The form factors at q{sup 2}=0 are calculated from the overlap integrals of the initial and final {Lambda}-type baryon states. To leading order in the heavy mass scale the structure of the form factors agrees with the HQET predictions including the normalization at zero recoil. The leading order {omega} dependence of the form factors is extracted by scaling arguments. By comparing the model form factors with the HQET predictions at O(1/m{sub Q}) we obtain a consistent set of model form factors up to O(1/m{sub Q}). With our preferred choice of parameter values we find that the contribution of the nonleading form factor is practically negligible. We use our form factor predictions to compute rates, spectra, and various asymmetry parameters for the semileptonic decay {Lambda}{sub b}{r_arrow}{Lambda}{sub c}{sup +}+l{sup {minus}}+{bar {nu}}{sub l}. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 560589
- Journal Information:
- Physical Review, D, Vol. 56, Issue 7; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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