Abstract
The Cascade3 Monte Carlo event generator based on Transverse Momentum Dependent (TMD) parton densities is described. Hard processes which are generated in collinear factorization with LO multileg or NLO parton level generators are extended by adding transverse momenta to the initial partons according to TMD densities and applying dedicated TMD parton showers and hadronization. Processes with off-shell kinematics within k_{{t}}-factorization, either internally implemented or from external packages via LHE files, can be processed for parton showering and hadronization. The initial state parton shower is tied to the TMD parton distribution, with all parameters fixed by the TMD distribution.
Highlights
The simulation of processes for high energy hadron colliders has been improved significantly in the past years by automation of next-to-leading order (NLO) calculations and matching of the hard processes to parton shower Monte Carlo event generators which include a simulation of hadronization
While the approaches of matching and merging matrix element calculations and parton showers are very successful, two ingredients important for high energy collisions are not treated: the matrix elements are calculated with collinear dynamics and the inclusion of initial state parton showers results in a net transverse momentum of the hard process; the special treatment of high energy effects is not included
The Cascade Monte Carlo event generator, developed originally for small x processes based on high-energy factorization [14] and the CCFM [15,16,17,18] evolution equation, has been extended to cover the full kinematic range by applying the Parton Branching (PB) method and the corresponding PB Transverse Momentum Dependent (TMD) parton densities [19,20]
Summary
The simulation of processes for high energy hadron colliders has been improved significantly in the past years by automation of next-to-leading order (NLO) calculations and matching of the hard processes to parton shower Monte Carlo event generators which include a simulation of hadronization. Among those automated tools are the MadGraph5_amc@nlo [1] generator based on the mc@nlo [2,3,4,5] method or the Powheg [6,7] generator for the calculation of the hard process. We mention features of the small-x mode of Cascade
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