Asymmetry effects of supersymmetric QCD in dilepton production

A Callan-Gross-type relation between the structure functions determining dilepton production, which is satisfied by the basic O(1) and O(α/sub s/) subprocesses of conventional QCD, is investigated in supersymmetric QCD (SQCD). It is found that SQCD subprocesses, mainly due to the presence of scalar quarks, strongly violate this relation, thus leading to sizable asymmetry effects in the angular distribution of dileptons. As an illustration, calculations are carried for p-barp→l+l-+X at CERN collider and Fermilab Tevatron energies (√s = 540 and 1600 GeV, respectively) and for pp→l+l-+X at Tevatron energy; with scalar quarks of mass 20 GeV and light gluinos, asymmetries in the range of 20%--5% are found. The significance of the effects as a test of the short-distance structure of SQCD (valence part of the scalar-quark distribution) is discussed