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Corrections to Angular Ordering in Multiple

One of the key ideas in describing the multiparticle production at high energies in the perturbative QCD is the angular ordering in successive soft-gluon emission. We analyse the angular distribution of particles in a jet, and investigate the corrections to the angular ordering. At a small angle from the jet direction, the angular ordering is exact at the next-to-leading order. At a large angle, the angular ordering overestimates the angular particle density by a factor (1 − γ ln cos(θ/2)), where γ is the anomalous dimension of the multiplicity. The O(γ) correction restores the boost invariance of the cross section.