Relativistic and Binding Energy Corrections to Direct Photon Production In Upsilon Decay
arXiv:hep-ph/9608244 · doi:10.1103/PhysRevD.54.3345
Abstract
A systematic gauge-invariant method is used to calculate the rate for an upsilon 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(v^2) 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.
13 pages, LateX, One figure (to be published in Phys. Rev. D, Sept. 1, 1996)
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