Examining whether the volume dependence of spectral weights can
distinguish between a resonance and a scattering state
Presenter: Constantia Alexandrou
C. Alexandrou and A. Tsapalis
Abstract: To distinguish, on the lattice, a pentaquark resonance from a KN scattering state, a criterion used is the volume dependence of the spectral
weight of the state. We test this approach by evaluating the two-pion state in
the I=2 channel using local operators. We find that the volume dependence
of the spectral weights is a delicate issue requiring accurate evaluation of the
correlator at large time separations. We discuss the implications of this result
on the analysis of the pentaquark system.
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