Surprises from Quarkonium Decay into Photons

Abstract

The perturbative QCD approach to quarkonium decay into a photon and hadrons is reconsidered. It is shown that a consistent treatment within perturbative QCD calls for the introduction of a fragmentation contribution which has been neglected so far. The ensuing phenomenological implications are discussed, and, in particular, the possibility of measuring the gluon fragmentation function of the photon is addressed. *To appear in the proceedings of the workshop QCD94, Montpellier, July '94.

4 pages + 3 figures, uuencoded postscript, Cambridge preprint Cavendish-HEP-94/09

References in corpus (1)

• Finite size vertex corrections to the three-gluon decay widths of $J/\psi$ and ${\rm Y}$ and a redetermination of ${\alpha }_s(\mu )$ at $\mu =m_c$ and $m_b$

Cited by in corpus (14)

• Effective field theories for heavy quarkonium
• A Phenomenological Analysis of Gluon Mass Effects in Inclusive Radiative Decays of the $J/\psi$ and $Υ
• Resumming the color-octet contribution to radiative Upsilon decay
• The Photon Spectrum in Upsilon Decays
• The Resummed Photon Spectrum in Radiative Upsilon Decays
• Measurement of the Direct Photon Momentum Spectrum in Upsilon(1S), Upsilon(2S), and Upsilon(3S) Decays
• Flavor-singlet light-cone amplitudes and radiative Upsilon decays in SCET
• Semi-inclusive radiative decays of Upsilon 1S
• Radiative decays and the nature of heavy quarkonia
• QCD Corrections to Radiative Upsilon Decays
• Kinematic Effects in Radiative Quarkonia Decays
• Cancellation of Sudakov Logarithms in Radiative Decays of Quarkonia
• The soft-energy region in the radiative decay of bound states
• The endpoint region in radiative quarkonia decays