"Pair production of scalar top quarks in e+e- collisions at ILC."

Abstract

We study the pair production of scalar top quarks in e+e- collisions with the subsequent decay of the top squarks into b-quarks and charginos. We simulate this process using PYTHIA6.4 for beam energies 2E_beam = 350, 400, 500, 800, 1000 GeV. Proposing a set of criteria we obtain a good separation of the signal stop events from top quark pair production which is the main background. The number of stop production events obtained with the proposed cuts for different energies is calculated for an integrated luminosity of 1000 1/fb. We propose a method to reconstruct the mass of the top squark, provided the mass of the lightest neutralino is known, and estimate the error of the mass determination for the case sqrt{s} = 500 GeV.Comment: 25 pages, 27 figures, ILC-NOTE-2008-042. v1 was presented by the 4-th author and published in the Proceedings of the 15-th International Seminar on High Energy Physics QUARKS-2008 (Institute for Nuclear Research of RAS, Sergiev Posad, Russia, 23-29 May 2008), V1, p.227-246, ISBN 978-5-94274-123-5. v2 - another set of cuts was chosen. v3 - some typos correcte