Abstract
Since glueballs are singlets, they should couple equally to , , and quarks, so that equal coupling strengths to and are expected. However, we show that chiral symmetry implies the scalar-glueball amplitude for is proportional to the quark mass, so that mixing with mesons is enhanced and decays to are favored over . Together with evidence from lattice calculations and experiment, this supports the hypothesis that is the ground state scalar glueball.
- Received 13 June 2005
DOI:https://doi.org/10.1103/PhysRevLett.95.172001
©2005 American Physical Society