TESTING CONTACT INTERACTIONS OF QUARKS AND GLUONS AT FUTURE pp COLLIDERS

We calculate the contributions of the allowed qqqq, GGG, GGGG, qqG and qqGG contact interactions of the standard QCD quarks and gluons, at a common scale Λ, to jet cross sections at the future hadron colliders. Assuming that the two-jet normalized angular-distribution measurements will be consistent with QCD, to 95% CL we obtain bounds Λ>35–40 TeV at LHC or Λ>50–80 TeV at SSC. A similar analysis of the three-jet events would give Λ>13–15 TeV or Λ>10–25 TeV, respectively.