Electroweak corrections to hadronic event shapes and jet production in e+e- annihilation

Details Electroweak corrections to hadronic event shapes and jet production in e+e- annihilation Electroweak corrections to hadronic event shapes and jet production in e+e- annihilation

2010-03-04

arxiv.org/abs/1003.0986v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

47 pages, 20 figures

Scientific paper

We present a complete calculation of the electroweak O(alpha^3 alpha_s) corrections to three-jet production and related event-shape observables at electron--positron colliders. The Z-boson resonance is described within the complex-mass scheme, rendering the calculation valid both in the resonance and off-shell regions. Higher-order initial-state radiation is included in the leading-logarithmic approximation. We properly account for the corrections to the total hadronic cross section and for the experimental photon isolation criteria. To this end we implement contributions of the quark-to-photon fragmentation function both in the slicing and subtraction formalism. The effects of the electroweak corrections on various event-shape distributions and on the three-jet rate are studied. They are typically at the few-per-cent level, and remnants of the radiative return are found even after inclusion of appropriate cuts.

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