Publication : t98/083

QCD corrections to e^+e^- -> 4 jets

Weinzierl S. (CEA, DSM, SPhT (Service de Physique Thorique), F-91191 Gif-sur-Yvette, FRANCE)
Abstract:
This thesis deals with perturbative QCD-corrections to four-jet production in electron-positron annihilation. The one-loop corrections to the subprocess e^+e^- -> q bar{q} Q bar{Q} are calculated, using modern techniques in order to calculate the one-loop amplitudes efficiently. These techniques include colour decomposition, the spinor helicity method and decompositions inspired by supersymmetry. The cut technique and the factorization in collinear limits are used to constrain the analytic form of the amplitudes. In a second step the virtual corrections from e^+e^- -> q \bar{q} Q \bar{Q} and e^+e^- -> q g g \bar{q} are implemented together with the corresponding real emission parts into a numerical program. The cancelation of the infrared singularities is based on the dipole formalism. Numerical values are given for the total cross-section, the D-parameter and the jet broadening variable.
Année de publication : 1998
Thse
Soutenance de thse : Universit Paris XI ; 1998-09-08
Lien : http://theses-EN-ligne.in2p3.fr/documents/archives0/00/00/08/14/
Keywords : Perturbative QCD, spinor helicity method, cut technique, four-jet production in e^+e^--annihilation, phase space slicing, dipole formalism, global event shape variables and jet shape variables.
Langue : Anglais
Editeurs : Kosower D.A.

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