MSSM corrections to the top-antitop quark forward-backward asymmetry at the Tevatron

We study the effects of the complete supersymmetric QCD and electroweak one-loop corrections to the tt̄ forward-backward asymmetry at the Fermilab Tevatron pp̄ collider. We work in the complex Minimal Supersymmetric Standard Model (MSSM), only restricted by the condition of minimal flavor violation (MFV). We perform a comprehensive scan over the relevant parameter space of the complex MFV-MSSM and determine the maximal possible contributions of these MSSM loop corrections to the forward-backward asymmetry in the tt̄ center-of-mass frame. We find that the SUSY loop-induced asymmetry at the Tevatron with M_tt̄ >450 GeV can be at most +2 % for very light SUSY particles, i. e. for m_t̃1 <100 GeV and m_min = Min{m_g̃, m_ũ,1,2, md_d̃1,2} <100 GeV, which reduces to 0. 1 % for gluino and squark masses in the range 850 GeV-1000 GeV and a light top squark of m_t̃1 = 200 GeV.