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High Energy Physics - Phenomenology

arXiv:hep-ph/9806455 (hep-ph)
[Submitted on 23 Jun 1998]

Title:Colour-Octet Effects in Radiative $Υ$ Decays

Authors:Fabio Maltoni, Andrea Petrelli
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Abstract: We investigate the effects of colour-octet contributions to the radiative $\Upsilon$ decay within the Bodwin, Braaten and Lepage NRQCD factorization framework. Photons coming both from the coupling to hard processes (`direct') and by collinear emission from light quarks (`fragmentation') are consistently included at next-to-leading order (NLO) in $\alpha_s$. An estimate for the non-perturbative matrix elements which enter in the final result is then obtained. By comparing the NRQCD prediction at NLO for total decay rates with the experimental data, it is found that the non-perturbative parameters must be smaller than expected from the na\"ıve scaling rules of NRQCD. Nevertheless, colour-octet contributions to the shape of the photon spectrum turn out to be significant.
Comments: 25 pages, Latex, 8 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: CERN-TH/98-152, ANL-HEP-PR-98-44
Cite as: arXiv:hep-ph/9806455
  (or arXiv:hep-ph/9806455v1 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/9806455
Journal reference: Phys.Rev.D59:074006,1999
Related DOI: https://doi.org/10.1103/PhysRevD.59.074006

Submission history

From: Andrea Petrelli [view email]
[v1] Tue, 23 Jun 1998 19:52:25 UTC (60 KB)
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