Relativistic and binding energy corrections to direct photon production in Υ decay
Abstract
A systematic gauge-invariant method, which starts directly from QCD, is used to calculate the rate for an Υ meson to decay inclusively into a prompt photon. An expansion is made in the quark relative velocity v, which is a small natural parameter for heavy quark systems. Inclusion of these O(v2) corrections tends to increase the photon rate in the middle z range and to lower it for larger z, a feature supported by the data.
- Publication:
-
Physical Review D
- Pub Date:
- September 1996
- DOI:
- 10.1103/PhysRevD.54.3345
- arXiv:
- arXiv:hep-ph/9608244
- Bibcode:
- 1996PhRvD..54.3345Y
- Keywords:
-
- 13.20.Gd;
- 12.38.Bx;
- Decays of J/psi Upsilon and other quarkonia;
- Perturbative calculations;
- High Energy Physics - Phenomenology
- E-Print:
- 13 pages, LateX, One figure (to be published in Phys. Rev. D, Sept. 1, 1996)