f(Q$_{0}$): ${{\boldsymbol t}}{{\overline{\boldsymbol t}}}$ Fraction of Events with a Veto on Additional Central Jet Activity in ${{\boldsymbol p}}{{\boldsymbol p}}$ Collisions at $\sqrt {s }$ = 7 TeV
INSPIRE search
Q$_{0}$ denotes the threshold of the additional jet $p_T$.