Irreducible QCD backgrounds to top searches in semi-leptonic final states at the Next Linear Collider

Details Irreducible QCD backgrounds to top searches in semi-leptonic final states at the Next Linear Collider Irreducible QCD backgrounds to top searches in semi-leptonic final states at the Next Linear Collider

1999-01-28

arxiv.org/abs/hep-ph/9901438v1

Eur.Phys.J.C9:229-234,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, latex, epsfig, 8 figures

Scientific paper

10.1007/s100529900066

At future electron-positron colliders, one of the largest irreducible backgrounds to top searches in the channel `4 jets + lepton + missing energy' comes from QCD events of order $\alpha_s^2$. We compute here such processes exactly at the parton level by resorting to 2 -> 6 matrix elements exploiting helicity amplitude techniques. We adopt a typical selection procedure based on the tagging of a high momentum and separated lepton. We finally outline kinematic differences between signal and background events that can be exploited to further reduce such a QCD noise.

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