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Finite Lifetime Effects in Top Quark Pair Production at Threshold

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Finite Lifetime Effects in Top Quark Pair Production at Threshold

Christoph Reißer (Author)

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ISBN-13 (Printausgabe) 3867276072
ISBN-13 (Hard Copy) 9783867276078
ISBN-13 (eBook) 9783736926073
Language English
Page Number 152
Edition 1 Aufl.
Volume 0
Publication Place Göttingen
Place of Dissertation München
Publication Date 2008-06-10
General Categorization Dissertation
Departments Physics
Keywords Non-relativistic QCD, top quark decay, absorptive Wilson coefficients.
Description

In this work electroweak effects to the e+e− top pair production cross section at threshold are determined that are associated to the finite top lifetime. A new effective theory approach is developed that involves complex Wilson coefficients and anomalous dimensions and that allows to treat these effects systematically at NNLL order in a non-relativistic expansion. The imaginary parts are associated to experimental cuts that are imposed to define the cross section in analogy to the optical theory in an absorptive medium. In addition electroweak effects at NNLL order not related to instability are computed. The results are important for an extraction of Standard Model parameters at a future Linear Collider.