2002/09/17 by A. Salim Safir, Safir, A. Salim
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0209191
6 pages; 5 figures (requires epsfig, psfrag). Talk presented at the $10^{th}$ International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY02), Hamburg, Germany, 10-23 June 2002
arxiv created 2002/09/17 · arxiv updated 2009/11/30
We calculate the independent helicity amplitudes in the decays B → K^* ℓ+ ℓ- and B → ρℓ ν_ℓ in the so-called Large-Energy-Effective-Theory (LEET). Taking into account the dominant O(αs) and SU(3) symmetry-breaking effects, we calculate various single (and total) distributions in these decays making use of the presently available data and decay form factors calculated in the QCD sum rule approach. Differential decay rates in the dilepton invariant mass and the Forward-Backward asymmetry in B → K^* ℓ+ ℓ- are worked out. Measurements of the ratios Ri(s) ≡ d ΓHi(s)(B → K^* ℓ+ ℓ-)/ d ΓHi(s)(B → ρℓ ν_ℓ), involving the helicity amplitudes Hi(s), i=0,+1, -1, as precision tests of the standard model in semileptonic rare B-decays are emphasized. We argue that R0(s) and R-(s) can be used to determine the CKM ratio | Vub|/| Vts | and search for new physics, where the later is illustrated by supersymmetry.