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in creator/contributor: "Zanderighi, G."  
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Towards pair production near threshold with unstable particle effective theory

Description: We illustrate the use of effective theory techniques to describe processes involving unstable particles close to resonance. First, we present the main ideas in the context of a scalar resonance in an Abelian gauge-Yukawa model. We then outline the necessary modifications to describe W-pair production close to threshold in electron-positron collisions.
Date: October 1, 2004
Creator: Beneke, M.; Kauer, N.; Signer, A. & Zanderighi, G.
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Partner: UNT Libraries Government Documents Department
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Semi-numerical evaluation of one-loop corrections

Description: We present a semi-numerical algorithm to calculate one-loop virtual corrections to scattering amplitudes. The divergences of the loop amplitudes are regulated using dimensional regularization. We treat in detail the case of amplitudes with up to five external legs and massless internal lines, although the method is more generally applicable. Tensor integrals are reduced to generalized scalar integrals, which in turn are reduced to a set of known basis integrals using recursion relations. The re… more
Date: August 1, 2005
Creator: Ellis, R. K.; Giele, W. T. & Zanderighi, G.
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Partner: UNT Libraries Government Documents Department
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Resummation

Description: We review the work discussed and developed under the topic ''Resummation'' at Working Group 2 ''Multijet final states and energy flow'', of the HERALHC Workshop. We emphasize the role played by HERA observables in the development of resummation tools via, for instance, the discovery and resummation of non-global logarithms. We describe the event-shapes subsequently developed for hadron colliders and present resummed predictions for the same using the automated resummation program CAESAR. We als… more
Date: August 1, 2005
Creator: Banfi, A.; Corcella, G.; Dasgupta, M.; Delenda, Y.; Salam, G. P. & Zanderighi, G.
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Partner: UNT Libraries Government Documents Department
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The QCD/SM working group: Summary report

Description: Among the many physics processes at TeV hadron colliders, we look most eagerly for those that display signs of the Higgs boson or of new physics. We do so however amid an abundance of processes that proceed via Standard Model (SM) and in particular Quantum Chromodynamics (QCD) interactions, and that are interesting in their own right. Good knowledge of these processes is required to help us distinguish the new from the known. Their theoretical and experimental study teaches us at the same time … more
Date: April 9, 2004
Creator: Dobbs, Matt; Frixione, S.; Laenen, E.; De Roeck, A.; Tollefson, K.; Andersen, J. et al.
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Partner: UNT Libraries Government Documents Department
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