Quantum effects on t\rightarrow H^{+}\,b in the MSSM: a window to “virtual” supersymmetry? |
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Authors: | JA Coarasa David Garcia Jaume Guasch Ricardo A Jiménez Joan Solà |
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Institution: | (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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Abstract: | We analyze the one-loop effects (strong and electroweak) on the unconventional top quark decay mode within the MSSM. The results are presented in the on-shell renormalization scheme with a physically well motivated definition
of . 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 , the corrections to 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 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.
Received: 18 April 1997 / Revised version: 18 June 1997 |
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