The Flavour-Changing Neutral Currents Decay t-->Hq at ATLAS Experiment
Abstract
The sensitivity of the ATLAS experiment to the top-quark rare decay via flavour-changing neutral currents t --> Hq (q represents c and u quarks) has been studied at sqrt{s} = 14 TeV in the decay mode of ttbar --> HqWb --> WW*q,Wb -->l \nu l \nu j, l^{\pm} \nu b, (l=e, \mu). The Standard Model backgrounds ttbar, ttbar H, WZ and WH have been analysed. The signal and backgrounds were generated via PYTHIA 5.7 and simulated and analysed using ATLFAST 2.51. A branching ratio for t --> Hq -->WW*q as low as 2.0x10^{-3} for m_H=150 GeV and 2.1x10^{-3} for m_H=160 GeV could be discovered at the 5 \sigma level with an integrated luminosity of 100 fb^{-1}.
Cite
@article{arxiv.hep-ex/0505079,
title = {The Flavour-Changing Neutral Currents Decay t-->Hq at ATLAS Experiment},
author = {L. Chikovani and T. Djobava and T. Grigalashvili},
journal= {arXiv preprint arXiv:hep-ex/0505079},
year = {2007}
}
Comments
14 pages, 6 figures, Int. Workshop and School "Future Collider Physics", Tbilisi, 29 Sept-4 Oct, Georgia; CGSWHP, 30 Aug-4 Sept, 2004