Formation lengths of hadrons in lepto-production

TL;DR

This paper investigates the formation lengths of hadrons produced in deep inelastic scattering, revealing charge-dependent differences and the impact of resonance decay, within the framework of the symmetric Lund model.

Contribution

It provides a detailed analysis of how hadron formation lengths depend on electric charge and production mechanism in lepto-production, using the symmetric Lund model.

Findings

Positively charged hadrons have longer formation lengths in electro- and CC neutrino-production.

Resonance decay reduces the formation lengths of pions.

Charge-dependent differences are observed between neutrino and antineutrino production.

Abstract

The average formation lengths of the hadrons produced during the deep inelastic scattering (DIS) of leptons on protons are studied in the framework of the symmetric Lund model. It is shown that these formation lengths essentially depend on the electric charges of the hadron. For electro-production and charged current (CC) neutrino-production, the average formation lengths of positively charged particles are larger than those of negatively charged antiparticles. This situation is reversed for CC antineutrino-production. In all the mentioned cases, the main mechanism is the direct production of hadrons. The additional mechanism of hadron production, through the decay of resonances, is essential only for pions and leads to a decrease in the average formation lengths.