Comparative study of the decays B>(K,K^{*})l^{+}l^{} in the standard model and supersymmetric theories
Abstract
Using improved theoretical calculations of the decay form factors in the light cone QCD sum rule approach, we investigate the decay rates, dilepton invariant mass spectra and the forwardbackward (FB) asymmetry in the decays B>(K,K^{*})l^{+}l^{} (l^{+/}=e^{+/},μ^{+/},τ^{+/}) in the standard model (SM) and a number of popular variants of the supersymmetric (SUSY) models. Theoretical precision on the differential decay rates and FB asymmetry is estimated in these theories taking into account various parametric uncertainties. We show that existing data on B>X_{s}γ and the experimental upper limit on the branching ratio B(B>K^{*}μ^{+}μ^{}) provide interesting bounds on the coefficients of the underlying effective theory. We argue that the FB asymmetry in B>K^{*}l^{+}l^{} constitutes a precision test of the SM and its measurement in forthcoming experiments may reveal new physics. In particular, the presently allowed largetan β solutions in SUGRA models, as well as more general flavorviolating SUSY models, yield FB asymmetries which are characteristically different from the corresponding ones in the SM.
 Publication:

Physical Review D
 Pub Date:
 April 2000
 DOI:
 10.1103/PhysRevD.61.074024
 arXiv:
 arXiv:hepph/9910221
 Bibcode:
 2000PhRvD..61g4024A
 Keywords:

 13.20.He;
 13.25.Hw;
 Decays of bottom mesons;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 36 pages, 12 figures (require epsfig.sty), 8 Tables, LaTeX2e