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



ID: 544211.0, MPI für Physik / MPI für Physik
Next-to-leading-logarithmic QCD Corrections to the Cross Section sigma(e+e- to t bar t H) at 500 GeV
Authors:Farrell, C.; Hoang, A. H.
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:74
Start Page:014008
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We determine the next-to-leading logarithmic (NLL) QCD corrections to the cross section sigma(e+e- to t bar t H) for center-of-mass energies up to 500 GeV. The dynamics is dominated by nonrelativistic effects, and the summation of terms singular in the relative t bar t velocity is mandatory to all orders in the strong coupling constant alpha_s using an effective theory. The summations lead to an enhancement of the tree level predictions by about a factor of two and are important for the determination of the top Yukawa coupling. We also study the impact of polarization of the electron-positron beams and provide a fast approximation formula for the known O(alpha_s) QCD fixed-order prediction.
Classification / Thesaurus:Phenomenology of High Energy Physics
Comment of the Author/Creator:18 pages, 3 tables, 5 figures
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2006-36
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/hep-ph/0604166
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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