Colour-octet effects in radiative {upsilon} decays.
Journal Article
·
· Phys. Rev. D
OSTI ID:938404
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}{sub 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 nai ve scaling rules of NRQCD. Nevertheless, colour-octet contributions to the shape of the photon spectrum turn out to be significant.
- Research Organization:
- Argonne National Laboratory (ANL)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 938404
- Report Number(s):
- ANL-HEP-PR-98-44
- Journal Information:
- Phys. Rev. D, Journal Name: Phys. Rev. D Journal Issue: 7 ; Apr. 1999 Vol. 5907; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- ENGLISH
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