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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 544929.0, MPI für Physik / MPI für Physik
Complete electroweak O(alpha) corrections to charged-current e+e- --> 4fermion processes
Authors:Denner, A.; Dittmaier, S.; Roth, M.; Wieders, L. H.
Date of Publication (YYYY-MM-DD):2005
Title of Journal:Physics Letters B
Journal Abbrev.:Phys.Lett.B
Issue / Number:612
Start Page:223
End Page:232
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:The complete electroweak O(alpha) corrections are calculated for the charged-current four-fermion production processes e+e- --> nu_tau tau+ mu- anti-nu_mu, u anti-d mu- anti-nu_mu, and u anti-d s anti-c. The calculation is performed using complex gauge-boson masses, supplemented by complex couplings to restore gauge invariance. The evaluation of the occurring one-loop tensor integrals, which include 5- and 6-point functions, requires new techniques. Explicit numerical results are presented for total cross sections in the energy range from the W-pair-production threshold region up to a scattering energy of 2TeV. A comparison with the predictions based on the ``double-pole approximation'' (DPA) provided by the generator RacoonWW reveals corrections beyond DPA of < 0.5% in the energy range 170-300GeV, in agreement with previous estimates for the intrinsic DPA uncertainty. The difference to the DPA increases to 1-2% for sqrt{s} = 1-2TeV. At threshold, where the DPA becomes unreliable, the full O(alpha) calculation corrects an improved Born approximation (IBA) by about 1.6%, also consistent with an error estimate of the IBA.
Classification / Thesaurus:Phenomenology of High Energy Physics
Comment of the Author/Creator:14 pages, latex, 4 postscript figures
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2005-8
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/hep-ph/0502063
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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