Eur. Phys. J. C (2009) 61: 401-410
https://doi.org/10.1140/epjc/s10052-009-1001-7

Regular Article - Theoretical Physics

Asymmetry parameter of K ₁(1270,1400) by analyzing the transition form factors within QCD

Physics Department, Middle East Technical University, 06531, Ankara, Turkey

^* e-mail: mbayar@metu.edu.tr

Received: 14 November 2008
Revised: 10 January 2009
Published online: 8 April 2009

Abstract

Separating the mixture of the K ₁(1270) and K ₁(1400) states, the transition form factors are calculated in the three-point QCD sum rule approach. The longitudinal, transverse and total decay widths as well as the asymmetry parameter, characterizing the polarization of the axial K ₁(1270,1400) and the branching ratio for these decays, are evaluated.