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

  • S. Moretti
Theoretical physics

Abstract.

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 \(\to\) 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.

Keywords

Matrix Element Selection Procedure Background Event High Momentum Helicity Amplitude 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • S. Moretti
    • 1
  1. 1.Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK (e-mail: moretti@v2.rl.ac.uk) GB

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