Eur. Phys. J. A (2005) 24: 411-418
https://doi.org/10.1140/epja/i2005-10013-7

Original Article

Electroweak properties of the π, K and K^*(892) in the three forms of relativistic kinematics

¹ CCAST (World Lab), P.O. Box 8730, 100080, Beijing, PRC
² Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918-4, 100049, Beijing, PRC
³ Graduate School of the Chinese Academy of Sciences, 100049, Beijing, PRC
⁴ Department of Physics and Astronomy, University of Pittsburgh, PA 15260, USA
⁵ Helsinki Institute of Physics and Department of Physical Sciences, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland

Received: 18 January 2005
Accepted: 28 March 2005
Published online: 24 May 2005

Abstract

The electromagnetic form factors, charge radii and decay constants of π, K and K ^*(892) are calculated using the three forms of relativistic kinematics: instant form, point form and (light) front form. Simple representations of the mass operator together with single-quark currents are employed with all the forms. Making use of previously fixed parameters, together with the constituent-quark mass for the strange quark, a reasonable reproduction of the available data for form factors, charge radii and decay constants of π, ρ, K and K ^*(892) is obtained in front form. With the instant form a similar description, but with a systematic underestimation of the vector meson decay constants is obtained using two different sets of parameters, one for π and ρ and another one for K and K ^*(892). The point form produces a poor description of the data.