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

作者：Berge Stefan^*; Wackeroth Doreen; Wiebusch Martin

来源：European Physical Journal C, 2012, 72(8): 2114.

DOI：10.1140/epjc/s10052-012-2114-y

We study the effects of the complete supersymmetric QCD and electroweak one-loop corrections to the t (t) over bar forward-backward asymmetry at the Fermilab Tevatron p (p) over bar 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 t (t) over bar center-of-mass frame. We find that the SUSY loop-induced asymmetry at the Tevatron with M-t (t) over bar %26gt; 450 GeV can be at most + 2 % for very light SUSY particles, i.e. for m((t) over tilde1) %26lt; 100 GeV and m(min) = Min{m(%26lt;(g)over tilde%26gt;), m((u) over tilde1,2), m((d) over tilde1,2)} %26lt; 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(%26lt;(t)over tilde%26gt;1) = 200 GeV.

• 出版日期2012-8