Colour rearrangement for dipole showers

Area of Science:

• High-Energy Physics
• Quantum Chromodynamics (QCD)
• Particle Physics

Background:

• Accurate simulation of particle showers is crucial for interpreting experimental data in high-energy physics.
• Dipole shower algorithms are widely used but require precise handling of colour evolution.
• Existing methods may introduce approximations in colour amplitude calculations.

Purpose of the Study:

• To introduce a novel algorithm for rearranging colour chains in dipole showers.
• To improve the accuracy of parton shower simulations by aligning them with matrix element colour structures.
• To provide a more precise tool for theoretical predictions in quantum chromodynamics.

Main Methods:

• Developed an algorithm to reorder colour chains within the dipole shower framework.
• Implemented the algorithm within the Herwig event generator's dipole shower.
• Utilized simple matrix elements to define the target colour configurations.

Main Results:

• The algorithm successfully rearranges colour chains according to matrix element colour amplitudes.
• Comparisons between the modified Herwig dipole shower and experimental data show improved agreement.
• The procedure enhances the fidelity of parton shower simulations.

Conclusions:

• The presented algorithm offers a significant improvement in the simulation of colour evolution in parton showers.
• This method provides more accurate theoretical predictions for high-energy physics experiments.
• The implementation in Herwig demonstrates the practical applicability and effectiveness of the approach.