QCDINS 2.0 - A Monte Carlo generator for instanton-induced processes in deep-inelastic scattering

TL;DR

This paper introduces QCDINS 2.0, a Monte Carlo generator for simulating instanton-induced processes in deep-inelastic scattering, integrating theoretical predictions with existing event simulation tools for detailed modeling.

Contribution

It presents an updated Monte Carlo generator that models instanton-induced events in deep-inelastic scattering, incorporating theoretical features and interfacing with HERWIG and JETSET.

Findings

Incorporates theoretically predicted instanton production rates.

Models flavor democratic and isotropic final states.

Generates high multiplicity partonic events with Poisson distribution.

Abstract

We describe a Monte Carlo event generator for the simulation of QCD-instanton induced processes in deep-inelastic scattering (HERA). The QCDINS package is designed as an ``add-on'' hard process generator interfaced to the general hadronic event simulation package HERWIG. It incorporates the theoretically predicted production rate for instanton-induced events as well as the essential characteristics that have been derived theoretically for the partonic final state of instanton-induced processes: notably, the flavour democratic and isotropic production of the partonic final state, energy weight factors different for gluons and quarks, and a high average multiplicity O(10) of produced partons with a Poisson distribution of the gluon multiplicity. While the subsequent perturbative evolution of the generated partons is always handled by the HERWIG package, the final hadronization step may optionally be performed also by means of the general hadronic event simulation package JETSET.