Forward-backward asymmetries in (Lambda_b -> Lambda l^+ l^-) decay beyond the standard model

Details Forward-backward asymmetries in (Lambda_b -> Lambda l^+ l^-) decay beyond the standard model Forward-backward asymmetries in (Lambda_b -> Lambda l^+ l^-) decay beyond the standard model

2004-07-19

arxiv.org/abs/hep-ph/0407217v2

Nucl.Phys. B709 (2005) 115-140

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 17 figures, LaTeX formatted

Scientific paper

10.1016/j.nuclphysb.2004.12.012

We study the doubly-polarized lepton pair forward-backward asymmetries in (Lambda_b -> Lambda l^+ l^-) decay using a general, model independent form of the effective Hamiltonian. We present the general expression for nine double-polarization forward-backward asymmetries. It is observed that, the study of the forward-backward asymmetries of the doubly-polarized lepton pair is a very useful tool for establishing new physics beyond the standard model. Moreover, the correlation between forward-backward asymmetry and branching ratio is investigated. It is shown that there exist certain certain regions of the new Wilson coefficients where new physics can be established by measuring the polarized forward-backward asymmetry only.

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