Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-14
Eur.Phys.J.C66:271-281,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages in LaTeX, including 7 encapsulated PostScript figures, published version
Scientific paper
10.1140/epjc/s10052-010-1237-2
In searching for indications of new physics scalar particle and unparticle couplings in e^+ e^- \to t\bar t, we consider the role of transversely polarized initial beams at e^+ e^- colliders. By using a general relativistic spin density matrix formalism for describing the particles spin states, we find analytical expressions for the squared amplitude of the process with t or \bar t polarization measured, including the anomalous coupling contributions. Thanks to the transversely polarized initial beams these contributions are first order anomalous coupling corrections to the Standard Model (SM) contributions. We present and analyse the main features of the SM and anomalous coupling contributions. We show how differences between SM and anomalous coupling contributions provide means to search for anomalous coupling manifestations at future e^+ e^- linear colliders.
Groote Stefan
Liivat H.
Ots I.
Sepp T.
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