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arXiv · 0805.1049

Angular correlations in multi-jet final states from kt-dependent parton showers

F. Hautmann·H. Jung
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Abstract

We investigate parton-branching methods based on transverse-momentum dependent (TMD) parton distributions and matrix elements for the Monte Carlo simulation of multi-particle final states at high-energy colliders. We observe that recently measured angular correlations in ep final states with multiple hadronic jets probe QCD coherence effects in the space-like branching, associated with finite-angle gluon radiation from partons carrying small longitudinal momenta, and not included in standard shower generators. We present Monte Carlo calculations for azimuthal two-jet and three-jet distributions, for jet multiplicities and for correlations in the transverse-momentum imbalance between the leading jets. We discuss comparisons with current experimental multi-jet data, and implications of corrections to collinear-ordered showers for LHC final states.

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F. Hautmann, H. Jung. 2008-09-24. Angular correlations in multi-jet final states from kt-dependent parton showers. https://doi.org/10.1088/1126-6708%2F2008%2F10%2F113

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