Probing scalar particle and unparticle couplings in e(+)e(-) -> t(t)over-bar with transversely polarized beams

作者：Groote S^*; Liivat H; Ots I; Sepp T

来源：European Physical Journal C, 2010, 66(1-2): 271-281.

DOI：10.1140/epjc/s10052-010-1237-2

In searching for indications of new-physics scalar particle and unparticle couplings in e(+)e(-). t (t) over bar, 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 (t) over bar polarization measured, including the anomalous coupling contributions. Thanks to the transversely polarized initial beams these contributions are first order anomalous coupling corrections to the StandardModel (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.

• 出版日期2010-3