Nonperturbative effects in the energy energy correlation
May, 1999
42 pages
Published in:
- JHEP 07 (1999) 012
e-Print:
- hep-ph/9905339 [hep-ph]
Report number:
- BICOCCA-FT-99-01,
- CAVENDISH-HEP-99-01
View in:
Citations per year
Abstract: (arXiv)
The fully resummed next-to-leading-order perturbative calculation of the energy-energy correlation in annihilation is extended to include the leading non-perturbative power-behaved contributions computed using the ``dispersive method'' applied earlier to event shape variables. The correlation between a leading (anti)quark and a gluon produces a non-perturbative 1/Q contribution, while non-perturbative effects in the quark-antiquark correlation give rise to a smaller contribution . In the back-to-back region, the power-suppressed contributions actually decrease much more slowly, as small non-integer powers of 1/Q, as a result of the interplay with perturbative effects. The hypothesis of a universal low-energy form for the strong coupling relates the coefficients of these contributions to those measured for other observables.Note:
- 41 pages, LaTeX, 4 figures, uses JHEP.cls
- electron positron: annihilation
- jet: electroproduction
- quantum chromodynamics
- perturbation theory: higher-order
- correlation: energy
- effect: nonperturbative
- quark gluon: correlation
- quark antiquark: correlation
- kinematics
- gluon: radiation
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