Relativistic and Binding Energy Corrections to Direct Photon Production In Upsilon Decay

Details Relativistic and Binding Energy Corrections to Direct Photon Production In Upsilon Decay Relativistic and Binding Energy Corrections to Direct Photon Production In Upsilon Decay

1996-08-06

arxiv.org/abs/hep-ph/9608244v1

Phys.Rev. D54 (1996) 3345-3349

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, LateX, One figure (to be published in Phys. Rev. D, Sept. 1, 1996)

Scientific paper

10.1103/PhysRevD.54.3345

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.

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