The Kπ form factors from analyticity and unitarity

Abbas, Gauhar and Ananthanarayan, B and Caprini, I and Imsong, Sentitemsu I (2012) The Kπ form factors from analyticity and unitarity. In: Journal of Physics: Conference Series, 374 .

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Abstract

Analyticity and unitarity techniques are employed to obtain bounds on the shape parameters of the scalar and vector form factors of semileptonic K l3 decays. For this purpose we use vector and scalar correlators evaluated in pQCD, a low energy theorem for scalar form factor, lattice results for the ratio of kaon and pion decay constants, chiral perturbation theory calculations for the scalar form factor at the Callan-Treiman point and experimental information on the phase and modulus of Kπ form factors up to an energy t in = 1GeV 2. We further derive regions on the real axis and in the complex-energy plane where the form factors cannot have zeros.

Item Type:	Journal Article
Publication:	Journal of Physics: Conference Series
Publisher:	Institute of Physics
Additional Information:	Copyright for this article belongs to the IOP Science
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	13 Sep 2012 05:09
Last Modified:	13 Sep 2012 05:11
URI:	http://eprints.iisc.ac.in/id/eprint/45042

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