Angular distribution of muons pair-produced in pp collisions

Abstract

We study the angular distribution of muons in pp→μ⁺μ⁻+anything in a model based on quantum chromodynamics proposed recently to explain the high transverse momentum of the lepton pairs. The coefficients A, B, and C, which occur in the distribution 1+Acos²θ +Bsin2θcosφ+Csin²θcos2φ in the μ⁺μ⁻ center-of-mass frame, are calculated as functions of τ=m²/s (m is the μ⁺μ⁻ invariant mass, √s is the hadron center-of-mass energy) and r_τ=q_τ/√s (q_τ is the μ⁺μ⁻ transverse momentum in the hadron center-of-mass frame). It is found that on integration over r_τ, the distribution is not significantly different from that in the Drell-Yan model, i.e., 1+cos²θ. However, as functions of r_τ, A, B, and C show striking variations, an experiment verification of which would be a test of the model.