On two-body decays of a scalar glueball |
| |
Authors: | KT Chao Xiao-Gang He JP Ma |
| |
Institution: | (1) Department of Physics, Peking University, Beijing, P.R. China;(2) Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan;(3) Institute for Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing, P.R. China |
| |
Abstract: | We study two-body decays of a scalar glueball. We show that in QCD a spin-0 pure glueball (a state with only gluons) cannot
decay into a pair of light quarks if chiral symmetry holds exactly, i.e., the decay amplitude is chirally suppressed. However,
this chiral suppression does not materialize itself at the hadron level such as in decays into π+π- and K+K-. We show this explicitly in the two cases with the glueball much lighter and much heavier than the QCD scale using low-energy
theorems and perturbative QCD. For a heavy glueball, using QCD factorization based on an effective Lagrangian, we find that
the hadronization into ππ and KK leads to a large difference between Br(π+π-) and Br(K+K-); even the decay amplitude is not chirally suppressed. Our results can provide some understanding of the partonic contents
if Br(ππ) or Br(KK̄) is measured reliably. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|