Multichannel calculation of excited vector phi resonances and the phi(2170)

作者：Coito Susana^*; Rupp George; van Beveren Eef

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, 80(9): 094011.

DOI：10.1103/PhysRevD.80.094011

A multichannel calculation of excited J(PC)=1(--)phi states is carried out within a generalization of the resonance-spectrum expansion, which may shed light on the classification of the phi(2170) resonance, discovered by BABAR and originally denoted X(2175). In this framework, a complete spectrum of bare ss states is coupled to those Okubo-Zweig-Iizuka-allowed decay channels that should be most relevant for the considered energy range. The included S- and P-wave two-meson channels comprise the lowest pseudoscalar, vector, scalar, and axial-vector mesons, while in the qq sector both the S-3(1) and D-3(1) states are coupled. The only two free parameters are tuned so as to reproduce mass and width of the phi(1020), but come out reasonably close to previously used values. Among the model's T-matrix poles, there are good candidates for observed resonances, as well as other ones that should exist according to the quark model. Besides the expected resonances as unitarized confinement states, a dynamical resonance pole is found at (2186-i246) MeV. The huge width makes its interpretation as the phi(2170) somewhat dubious, but further improvements of the model may change this conclusion.

• 出版日期2009-11