A comparative study of small x Monte Carlos with and without QCD coherence effects

Abstract

We compare two Monte Carlo implementations of resummation schemes for the description of parton evolution at small values of Bjorken x. One of them is based on the Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution equation and generates fully differential parton distributions in momentum space making use of reggeized gluons. The other one is based on the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) partonic kernel where QCD coherence effects are introduced. It has been argued that both approaches agree with each other in the x -> 0 limit. We show that this is not the case for azimuthal angle dependent quantities since at high energies the BFKL approach is dominated by its zero conformal spin component while the CCFM gluon Green function receives contributions from all conformal spins even at very small x.

19 pages, 19 figures

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• The CCFM Monte Carlo generator CASCADE 2.2.0
• Mueller Navelet jets at LHC - complete NLL BFKL calculation
• Forward Jet Production at the Large Hadron Collider
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• The effect of NLO conformal spins in azimuthal angle decorrelation of jet pairs
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• Azimuthal decorrelation of forward jets in Deep Inelastic Scattering
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Cited by in corpus (28)

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• BFKL Azimuthal Imprints in Inclusive Three-jet Production at 7 and 13 TeV
• Dijet Production at Large Rapidity Separation in N=4 SYM
• Stability of Azimuthal-angle Observables under Higher Order Corrections in Inclusive Three-jet Production
• Scaling Patterns for QCD Jets
• Quark contribution to the gluon Regge trajectory at NLO from the high energy effective action
• The colour octet representation of the non-forward BFKL Green function
• Single bottom quark production in kT-factorisation
• A Monte Carlo study of double logarithms in the small x region
• The Dynamics of Particle-Particle Correlations and the Ridge Effect in Proton-Proton Collisions
• Bootstrap and momentum transfer dependence in small x evolution equations
• The next-to-leading order vertex for a forward jet plus a rapidity gap at high energies
• Inclusive three- and four-jet production in multi-Regge kinematics at the LHC
• Probing the BFKL dynamics in inclusive three jet production at the LHC
• The high-energy radiation pattern from BFKLex with double-log collinear contributions
• BFKL phenomenology: resummation of high-energy logs in semi-hard processes at LHC
• Multiperipheral final states in crowded twin-jet events at the LHC
• High-energy resummation in semi-hard processes at the LHC
• Open Spin Chains and Complexity in the High Energy Limit
• Estimation of saturation and coherence effects in the KGBJS equation - a non-linear CCFM equation
• Kinematical constraint effects in the evolution equations based on angular ordering
• A new Monte Carlo study of evolution equation with coherence
• The Forward Physics Facility at the High-Luminosity LHC
• Average minijet rapidity ratios in Mueller-Navelet jets
• Inclusive three jet production at the LHC as a new BFKL probe