Multi-parameter fits to the t-tbar threshold observables at a future e+e- linear collider

Details Multi-parameter fits to the t-tbar threshold observables at a future e+e- linear collider Multi-parameter fits to the t-tbar threshold observables at a future e+e- linear collider

2002-07-25

arxiv.org/abs/hep-ph/0207315v2

Eur.Phys.J.C27:49-55,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 7 figures. v2: Minor changes, mostly to style of figures

Scientific paper

10.1140/epjc/s2002-01094-1

A realistic study of the physics reach of a t-tbar threshold scan at a future e+e- linear collider is presented. The results obtained take into account experimental and, to a large extent, theoretical systematic errors, as well as beam effects. Because of the large correlations between the physical parameters that can be extracted from the threshold scan, a multi-parameter fit is seen as mandatory. It is shown that the top mass, the top width and alpha_s(M_Z) can be extracted simultaneously with uncertainties around 20 MeV, 30 MeV and 0.0012, respectively, while the top Yukawa coupling can be measured, with the previous three parameters, to an uncertainty of about 35%, after assuming an external prior on alpha_s of +/-0.001.

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