A comparative study of the decays B to (K,K*) ell{sup +} ell{sup -} in standard model and supersymmetric theories
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 forward-backward (FB) asymmetry in the decays B ---> (K, K*)l{sup +}l{sup -} (l{sup {+-}} = e{sup {+-}}, tau{sup {+-}}) 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{sub s}gamma and the experimental upper limit on the branching ratio B(B ---> K* mu{sup +}mu{sup -}) provide interesting bounds on the coefficients of the underlying effective theory. We argue that the FB-asymmetry in B ---> K*l{sup +}l{sup -} constitutes a precision test of the SM and its measurement in forthcoming experiments may reveal new physics. In particular, the presently allowed large- tan beta solutions in SUGRA models, as well as more general flavor-violating SUSY models, yield FB-asymmetries which are characteristically different from the corresponding ones in the SM.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 15075
- Report Number(s):
- SLAC-PUB-8269; TRN: US0204533
- Resource Relation:
- Other Information: PBD: 7 Oct 1999
- Country of Publication:
- United States
- Language:
- English
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