Radiative decay of Y into a scalar glueball
Journal
Physical Review D
Journal Volume
66
Journal Issue
7
Date Issued
2002
Author(s)
Abstract
We study the radiative decay of Y into a scalar glueball Y→γGs using QCD factorization. We find that for this process the nonperturbative effects can be factorized into a matrix element well defined in nonrelativistic QCD (NRQCD) and the gluon distribution amplitude. The same NRQCD matrix element appears also in the leptonic decay of Y and therefore can be determined from data. In the asymptotic limit the gluon distribution amplitude is known up to a normalization constant. Using a QCD sum-rule calculation for the normalization constant, we obtain Br(Y→γGs) to be in the range (1-2)×10-3. We also discuss some of the implications for Y→γfi decays. Near future data from CLEO-III can provide crucial information about scalar glueball properties. © 2002 The American Physical Society.
Type
journal article