Stringent constraints on the scalar K pi form factor from analyticity, unitarity and low-energy theorems

Abbas, G and Ananthanarayan, B and Caprini, I and Imsong, IS and Ramanan, S (2010) Stringent constraints on the scalar K pi form factor from analyticity, unitarity and low-energy theorems. In: European Physical Journal A (EPJ A), The - Hadrons and Nuclei, 44 (2). pp. 175-179.

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Abstract

We investigate the scalar K pi form factor at low energies by the method of unitarity bounds adapted so as to include information on the phase and modulus along the elastic region of the unitarity cut. Using at input the values of the form factor at t = 0 and the Callan-Treiman point, we obtain stringent constraints on the slope and curvature parameters of the Taylor expansion at the origin. Also, we predict a quite narrow range for the higher-order ChPT corrections at the second Callan-Treiman point.

Item Type:	Editorials/Short Communications
Publication:	European Physical Journal A (EPJ A), The - Hadrons and Nuclei
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	13 Jul 2010 07:07
Last Modified:	22 Feb 2012 06:32
URI:	http://eprints.iisc.ac.in/id/eprint/29122

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