Observation of a tensor glueball in the reactions p(p)over-bar ->pi pi, eta eta, eta eta '

摘要

Partial wave analysis of the reactions p (p) over bar --> pi pi, eta eta, eta eta' in the region of invariant masses 1900 - 2400 MeV indicates the existence of four relatively narrow tensor-isoscalar resonances f(2)( 1920), f(2)( 2020), f(2)( 2240), f(2)( 2300), as well as the broad state f(2)( 2000). The determined decay couplings of the broad resonance f(2)( 2000) --> pi(0)pi(0), eta eta, eta eta' satisfy the relations appropriate to those of a tensor glueball, while the couplings of other tensor states do not, thus verifying the glueball nature of f(2)( 2000). (C) 2005 Pleiades Publishing, Inc.