Report of the 2005 Snowmass Top/QCD Working Group
Open Access Publications from the University of California

## Report of the 2005 Snowmass Top/QCD Working Group

• Author(s): Juste, A
• Kiyo, Y
• Petriello, F
• Teubner, T
• Agashe, K
• Batra, P
• Baur, U
• Berger, CF
• Cembranos, JAR
• Ridder, A Gehrmann-De
• Gehrmann, T
• Glover, EWN
• Godfrey, S
• Hoang, A
• Perelstein, M
• Sullivan, Z
• Tait, T
• Zhu, S
• et al.
Abstract

This report discusses several topics in both top quark physics and QCD at an International Linear Collider (ILC). Issues such as measurements at the $t\bar{t}$ threshold, including both theoretical and machine requirements, and the determination of electroweak top quark couplings, are reviewed. New results concerning the potential of a 500 GeV $e^+e^-$ collider for measuring $Wtb$ couplings and the top quark Yukawa coupling are presented. The status of higher order QCD corrections to jet production cross sections, heavy quark form factors, and longitudinal gauge boson scattering, needed for percent-level studies at the ILC, are reviewed. A new study of the measurement of the hadronic structure of the photon at a $\gamma\gamma$ collider is presented. The effects on top quark properties from several models of new physics, including composite models, Little Higgs theories, and CPT violation, are studied.

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