Eur. Phys. J. C (2006) 48: 579-588
https://doi.org/10.1140/epjc/s10052-006-0040-6

Theoretical Physics

Regge-cascade hadronisation

Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, 11529, P.R. China

^* e-mail: odagirik@phys.sinica.edu.tw

Received: 29 June 2006
Published online: 24 October 2006

Abstract

We argue that the evolution of coloured partons into colour-singlet hadrons has an approximate factorisation into an extended parton-shower phase and a colour-singlet resonance-pole phase. The amplitude for the conversion of colour-connected partons into hadrons necessarily resembles Regge-pole amplitudes since qq̄ resonance amplitudes and Regge-pole amplitudes are related by duality. The ‘Regge-cascade’ factorisation property of the N-point Veneziano amplitude provides further justification of this protocol. This latter factorisation property, in turn, allows for the construction of general multi-hadron amplitudes in amplitude-squared factorized form from (1→2) link amplitudes. We suggest an algorithm with cascade-decay configuration, ordered in the transverse momentum, suitable for Monte Carlo simulation. We make a simple implementation of this procedure in Herwig++, obtaining some improvement to the description of the event-shape distributions at LEP.