Model-independent analysis of the rareBdecayB→Xsl+

Abstract

The most general model-independent analysis of the rare B decay B→X s l ϩ l Ϫ is presented. There are ten independent local four-Fermi interactions which may contribute to this process. The branching ratio, the forward-backward asymmetry, and the double differential rate are written as functions of the Wilson coefficients of the ten operators. We also study the correlation between the branching ratio and the forwardbackward asymmetry by changing each coefficient. This procedure tells us which types of operator contribute to the process, and it will be very useful to pin down new physics systematically, once we have the experimental data with high statistics and the deviation from the standard model is found. ͓S0556-2821͑99͒01605-7͔

Exclusive Λb→Λℓ+ℓ− decay beyond standard model

“…The decay amplitude for the b → sℓ + ℓ − transition in a general model independent form can be written in the following way (see [21], [25,26])…”

“…In general, new physics effects manifest themselves in rare decays either through new contributions to the Wilson coefficients existing in the SM or by introducing new structures in the effective Hamiltonian which are absent in the SM (see for example [21], [25]- [27] and the references therein). At this point we would like to remind that, the sensitivity of the physical observables to the new physics effects in the "heavy pseudoscalar meson → light pseudoscalar (vector) meson" transitions, like B → K(K * )ℓ + ℓ − are studied systematically in [21,27,28], using the most general form of the effective Hamiltonian.…”

Possible supersymmetric effects on angular distributions inB→K*(→Kπ)Kim1, Kim2, Lü3 2001Phys. Rev. DSelf Cite281390View full textAdd to dashboardCite

“…The decay b → sℓ + ℓ − suffers from severe backgrounds of J/ψ and ψ ′ resonance contributions in the measurement of branching fraction, and so it may not be easy to uncover new physics cleanly [3]. However, a number of methods have been discussed to detect new physics through the details of the decay process, such as differential distributions or polarization effects [4][5][6].…”

Longitudinal polarization asymmetry of leptons in pure leptonicBdecays

“…We have shown that this observable would provide a direct measurement of the physics of scalar and pseudoscalar type interactions. We also note that more information about these new interactions can be obtained by combining the present analysis with the other observables from B → X q ℓ + ℓ − [18].…”