K^L_{mu3} decay: A Stringent Test of Right-Handed Quark Currents

Details K^L_{mu3} decay: A Stringent Test of Right-Handed Quark Currents K^L_{mu3} decay: A Stringent Test of Right-Handed Quark Currents

2006-03-24

arxiv.org/abs/hep-ph/0603202v2

Phys.Lett.B638:480-486,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pp, 3 eps figs, Comment on the charged Kaon mode and few refs added

Scientific paper

10.1016/j.physletb.2006.05.079

Clean tests of a small admixture of right-handed quark currents directly coupled to the standard W are still lacking. We show that such non-standard couplings can be significantly constrained measuring the value of the scalar Kpi form factor at the Callan-Treiman point to a few percent. A realistic prospect of such a measurement in K^L_{mu3} decay based on an accurate dispersive representation of the scalar form factor is presented. The inadequacy of the currently used linear parametrisation is explained and illustrated using recent KTeV data. We briefly comment on the charged Kaon mode.

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