PT Journal
AU Xiao, CW
   Aceti, F
   Bayar, M
TI The small K pi component in the K* wave functions
SO European Physical Journal A
JI Eur. Phys. J. A
PY 2013
BP 22
EP 5pp
VL 49
IS 2
DI 10.1140/epja/i2013-13022-y
LA English
AB 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%.
ER