The small K pi component in the K* wave functions


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Xiao C. W. , Aceti F., Bayar M.

EUROPEAN PHYSICAL JOURNAL A, vol.49, no.2, 2013 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 49 Issue: 2
  • Publication Date: 2013
  • Doi Number: 10.1140/epja/i2013-13022-y
  • Title of Journal : EUROPEAN PHYSICAL JOURNAL A

Abstract

We use a recently developed formalism which generalizes Weinberg's compositeness condition to partial waves higher than s-wave in order to determine the probability of having a K pi component in the K* wave function. A fit is made to the K pi phase shifts in p-wave, from where the coupling of K* to K pi and the K pi loop function are determined. These ingredients allow us to determine that the K* is a genuine state, different from a K pi component, in a proportion of about 80%.