X(2175) as a resonant state of the phi K(K)overbar system

作者：Martinez Torres A; Khemchandani K P; Geng L S; Napsuciale M; Oset E

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, 78(7): 074031.

DOI：10.1103/PhysRevD.78.074031

We perform a Faddeev calculation for the three-meson system phi K(K)overbar, taking the interaction between two pseudoscalar mesons and between a vector and a pseudoscalar meson from the chiral unitary approach. We obtain a neat resonance peak around a total mass of 2150 MeV and an invariant mass for the K(K)overbar system around 970 MeV, very close to the f(0)(980) mass. The state appears in I=0 and qualifies as a phi f(0)(980) resonance. We enlarge the space of states including phi pi pi, since pi pi and K(K)overbar build up the f(0)(980), and find moderate changes that serve to quantify theoretical uncertainties. No state is seen in I=1. This finding provides a natural explanation for the recent state found at BABAR and BES, the X(2175), which decays into phi f(0)(980).

• 出版日期2008-10