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QCD corrections to static heavy-quark form factors.
W Bernreuther1, R Bonciani, T Gehrmann
1Institut für Theoretische Physik, RWTH Aachen, Germany.
Physical Review Letters
|February 21, 2006
Summary
Interactions involving top quarks and electroweak gauge bosons are sensitive to new physics. We calculated second-order QCD corrections to static form factors, finding significant effects for new physics searches.
Area of Science:
- Particle physics
- Quantum chromodynamics
- Electroweak interactions
Background:
- Interactions of heavy quarks, especially top quarks, with electroweak gauge bosons probe new physics related to electroweak symmetry breaking.
- Static form factors, including anomalous magnetic moments and effective weak charges, describe these interactions.
Purpose of the Study:
- To compute the second-order Quantum Chromodynamics (QCD) corrections to heavy quark static form factors.
- To assess the impact of these corrections on searches for new physics effects and anomalous couplings.
Main Methods:
- Perturbative QCD calculations.
- Focus on second-order corrections to static form factors.
Main Results:
- The second-order QCD corrections to static form factors are calculated.
- These corrections are found to be sizable, indicating their importance.
Conclusions:
- The computed QCD corrections are essential for accurate interpretation of experimental data.
- These results must be considered in future searches for new anomalous coupling effects in top quark interactions.