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Quantum effects on \(t\rightarrow H^{+}\,b\) in the MSSM: a window to “virtual” supersymmetry?

  • J.A. Coarasa
  • David Garcia
  • Jaume Guasch
  • Ricardo A. Jiménez
  • Joan Solà
Theoretical physics

Abstract.

We analyze the one-loop effects (strong and electroweak) on the unconventional top quark decay mode \(t\rightarrow H^{+}\, b\) within the MSSM. The results are presented in the on-shell renormalization scheme with a physically well motivated definition of \(\tan\beta\). The study of this process at the quantum level is useful to unravel the potential supersymmetric nature of the charged Higgs emerging from that decay. As compared with the standard mode \(t\rightarrow W^{+}\,b\), the corrections to \(t\rightarrow H^{+}\, b\) are large, slowly decoupling and persist at a sizeable level even for all sparticle masses well above the LEP 200 discovery range. As a matter of fact, the potential size of the SUSY effects, which amount to corrections of several ten percent, could counterbalance the standard QCD corrections and even make them to appear with the “wrong” sign. Therefore, if the charged Higgs decay of the top quark is kinematically allowed – a possibility which is not excluded by the existing measurements of the branching ratio \(BR(t\rightarrow W^{+}\,b)\) at the Tevatron – it could be an invaluable laboratory to search for “virtual” supersymmetry. While a first significant test of these effects could possibly be performed at the upgraded Tevatron, a more precise verification would most likely be carried out in future experiments at the LHC.

Keywords

Decay Mode Quantum Level Discovery Range Renormalization Scheme Higgs Decay 
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 1998

Authors and Affiliations

  • J.A. Coarasa
    • 1
  • David Garcia
    • 1
  • Jaume Guasch
    • 1
  • Ricardo A. Jiménez
    • 1
  • Joan Solà
    • 1
  1. 1. Grup de Física Teòrica, Institut de Física d'Altes Energies, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain ES

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