MC Event Generation

MC Event Generation#

Monte Carlo (MC) event generators are software libraries that simulate high-energy particle physics events.

Parton Showers#

Definition: The perturbative evolution of high-energy partons through successive splittings, governed by Quantum Chromodynamics (QCD), producing a cascade of quarks and gluons.

Approaches:

  • \(p_T\)-ordered parton shower: Splittings are ordered based on transverse momentum (\(p_T\)) of emissions.

  • Angular-ordered parton shower: Emissions are ordered by angles to account for QCD coherence and interference effects.

  • Dipole parton shower: Emissions are modeled as radiation off color-connected dipoles, improving soft and collinear emission descriptions.

Hadronization#

Definition: The non-perturbative process where partons transition into color-neutral hadrons, ensuring confinement as required by QCD.

Approaches:

  • String-based hadronization: Color-connected partons are treated as strings that fragment into hadrons based on string tension.

  • Cluster-based hadronization: Color-singlet partons are grouped into clusters, which decay into hadrons based on their mass and phase space.

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