Chiral Suppression of Scalar Glueball Decay
Abstract
Because glueballs are SU(3)Flavor singlets, they are expected to couple equally to u,d, and s quarks, so that equal coupling strengths to π+π- and K+K- are predicted. However, we show that chiral symmetry implies the scalar glueball amplitude for G0 is proportional to the quark mass, so that mixing with mesons is enhanced and decays to K+K- are favored over π+π-. Together with evidence from lattice calculations and from experiment, this supports the hypothesis that f0(1710) is the ground state scalar glueball.
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