Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-05-24
Eur.Phys.J.direct C4:18,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 12 figures
Scientific paper
10.1007/s1010502c0018
We study the exclusive rare decay B -> K l(bar) l. We calculate the relevant form factors within a relativistic constituent quark model, for the first time without employing the impulse approximation. The calculated form factors are used to evaluate differential decay rates and polarization observables. We present results on the q2-dependence of a set of observables with and without long-distance contributions. A similar analysis is done for the exclusive rare decays B_c -> D (D*) l(bar) l with special emphasis on the cascade decay B_c -> D* (-> D pi) l(bar) l. We derive a four-fold angular decay distribution for this process in terms of helicity amplitudes including lepton mass effects. The four-fold angular decay distribution allows to define a number of physical observables which are amenable to measurement. We compare our results with the results of other studies.
Faessler Amand
Gutsche Th.
Ivanov Michael A.
Körner Juergen G.
Lyubovitskij Valery E.
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