Search for New Physics in Rare D Decays

Details Search for New Physics in Rare D Decays Search for New Physics in Rare D Decays

2006-10-03

arxiv.org/abs/hep-ph/0610032v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures, talk presented by S. Fajfer at International Conference On High Energy Physics (ICHEP 06), 26 Jul-2 Aug 20

Scientific paper

In many extensions of the standard model an additional up-like heavy quark appears. Its appearance induces flavour changing neutral current transition in the up-quark region at the tree level. We investigate possible effects of these models in the c->u l+ l- transitions. First we determine impact of new physics on the relevant Wilson coefficients and then we reevaluate the standard model long-distance contributions. We calculate differential branching ratio for the D+ -> pi+ l+ l- and D0 -> rho0 l+ l- decays. Among all D decay modes these two are the simplest ones for the experimental studies. We also determine the forward-backward asymmetry for the D0 -> rho0 l+ l- decay and we comment on the effects of the Littlest Higgs model in both decay modes.

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