The European Physical Journal C

, Volume 66, Issue 1, pp 271–281

Probing scalar particle and unparticle couplings in \(e^{+}e^{-}\to t\bar{t}\) with transversely polarized beams

Regular Article - Theoretical Physics

DOI: 10.1140/epjc/s10052-010-1237-2

Cite this article as:
Groote, S., Liivat, H., Ots, I. et al. Eur. Phys. J. C (2010) 66: 271. doi: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 differential cross section 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 analyze 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.

Copyright information

© Springer-Verlag / Società Italiana di Fisica 2010

Authors and Affiliations

  1. 1.Loodus- ja Tehnoloogiateaduskond, Füüsika InstituutTartu ÜlikoolTartuEstonia
  2. 2.Institut für Physik der Johannes-Gutenberg-UniversitätMainzGermany