Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-11
JHEP 0301 (2003) 074
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, LaTeX with 6 figures, added references
Scientific paper
10.1088/1126-6708/2003/01/074
We discuss two dedicated observables in exclusive B -> K* l+ l- decay that can be used to study effects of physics beyond the standard model, namely the forward-backward asymmetry in the lepton spectrum and the isospin-asymmetry between decays of charged and neutral B mesons. We consider the region of large recoil-energy (i.e. small invariant mass of the lepton pair), and employ the QCD factorization approach to exclusive B meson decays. Sub-leading effects in the heavy quark mass expansion have been taken into account for the calculation of the isospin-asymmetry. We give predictions for decay asymmetries in the standard model, and its supersymmetric extension with minimal flavor violation, using parameter values allowed by current experimental constraints on B->X_s gamma decay.
Feldmann Thorsten
Matias Joaquim
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