Color coherence in multi-jet final states

Abstract

We discuss coherent QCD radiation from space-like parton branching and its effects on multi-jet final states at high-energy hadron colliders. Coherence effects for small longitudinal momentum fractions x are not included in the branching algorithms of standard shower Monte Carlo event generators. On the other hand, they are taken into account only partially in perturbative next-to-leading-order calculations for multi-jets. Such effects are present to all orders in alpha_s and can become logarithmically enhanced with \sqrt{s} / E_T, where E_T is the hardest jet transverse energy. We present results of summing coherence effects to all orders by parton-branching Monte Carlo methods based on transverse-momentum dependent matrix elements.

References in corpus (14)

• High-Energy Factorization and Small-X Deep Inelastic Scattering Beyond Leading Order
• The CCFM Monte Carlo generator CASCADE
• Infrared divergences and non-lightlike eikonal lines in Sudakov processes
• Measurement of Dijet Azimuthal Decorrelations at Central Rapidities in pp-bar Collisions at sqrt(s)=1.96 TeV
• Heavy top limit and double-logarithmic contributions to Higgs production at m_H^2 / s << 1
• Endpoint singularities in unintegrated parton distributions
• Azimuthal decorrelations between QCD jets at all orders
• kt - factorization and CCFM - the solution for describing the hadronic final states - everywhere ?
• Angular correlations in multi-jet final states from kt-dependent parton showers
• Gluon Distribution Functions in the kT-factorization Approach
• Multijet production at low $x_{\mathrm{Bj}}$ in deep inelastic scattering at HERA
• Uncertainties on Central Exclusive Scalar Luminosities from the unintegrated gluon distributions
• Cancellation of Sudakov Logarithms in Radiative Decays of Quarkonia
• The Qt distribution of the Breit current hemisphere in DIS as a probe of small-x broadening effects