“…Constraints have previously been compiled 1 , on two quark and two lepton contact interactions [14,15,16,17,18,19,20,21,22,23,24,25] as could arise in strongly coupled models, and in other New Physics scenarios such as leptoquarks [26,27,28,29,30,31,32] and Z ′ s [24,33,34,35,36]. As reviewed in section 2, the most natural basis of four fermion operators depends somewhat on the New Physics scenario.…”