• QCD corrections to decay-lepton polar and azimuthal angular distributions in e+et$$\overline t $$ in the soft-gluon approximationin the soft-gluon approximation

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      https://www.ias.ac.in/article/fulltext/pram/058/04/0575-0590

    • Keywords

       

      Top quark; electron-positron annihilation; QCD corrections

    • Abstract

       

      QCD corrections to order αs in the soft-gluon approximation to angular distributions of decay charged leptons in the process e+et$$\overline t $$, followed by semileptonic decay of t$$\overline t $$, are obtained in the esu− e centre-of-mass frame. As compared to distributions in the top rest frame, these have the advantage that they would allow direct comparison with experiment without the need to reconstruct the top rest frame. The results also do not depend on the choice of a spin quantization axis for t or t. Analytic expression for the triple distribution in the polar angle of t and polar and azimuthal angles of the lepton is obtained. Analytic expression is also derived for the distribution in the charged-lepton polar angle. Numerical values are discussed for √s=400, 800 and 1500 GeV.

    • Author Affiliations

       

      Saurabh D Rindani1

      1. Theory Group, Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, India
    • Dates

       
  • Pramana – Journal of Physics | News

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