Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

A Program for Baryon Generation and Its Applications to Baryon Fragmentation in DIS

Patrik Eden

TL;DR

The paper presents a practical manual for implementing the Modified Popcorn Scenarium (MOPS) in Lund string fragmentation, extending the popcorn baryon production mechanism to diquark-containing strings and detailing its integration with JETSET for applications in baryon fragmentation in DIS. It introduces new suppression physics and parameters, discusses the theoretical and phenomenological implications, and provides initial DIS-related testing and guidance for users. The work offers a concrete, code-level framework with explicit parameter controls, but notes limitations at low energies and several unimplemented aspects (e.g., closed strings, tensor mesons, junction strings) that require user care. Overall, it equips practitioners with a reproducible tool for refining baryon production spectra in hadronization, and demonstrates improved alignment with certain baryon observables while highlighting areas for future development.

Abstract

In an earlier paper, we discuss the ``popcorn'' model for baryon production in quark and gluon jets, and present an improved model (which we call Modified Popcorn Scenarium, MOPS). In this paper we give a manual to the MC program based on MOPS, and also discuss the application of the model to baryon fragmentation, i.e. fragmentation of strings originally contaning a diquark. Model predictions for baryon production in DIS are compared with data.

A Program for Baryon Generation and Its Applications to Baryon Fragmentation in DIS

TL;DR

The paper presents a practical manual for implementing the Modified Popcorn Scenarium (MOPS) in Lund string fragmentation, extending the popcorn baryon production mechanism to diquark-containing strings and detailing its integration with JETSET for applications in baryon fragmentation in DIS. It introduces new suppression physics and parameters, discusses the theoretical and phenomenological implications, and provides initial DIS-related testing and guidance for users. The work offers a concrete, code-level framework with explicit parameter controls, but notes limitations at low energies and several unimplemented aspects (e.g., closed strings, tensor mesons, junction strings) that require user care. Overall, it equips practitioners with a reproducible tool for refining baryon production spectra in hadronization, and demonstrates improved alignment with certain baryon observables while highlighting areas for future development.

Abstract

In an earlier paper, we discuss the ``popcorn'' model for baryon production in quark and gluon jets, and present an improved model (which we call Modified Popcorn Scenarium, MOPS). In this paper we give a manual to the MC program based on MOPS, and also discuss the application of the model to baryon fragmentation, i.e. fragmentation of strings originally contaning a diquark. Model predictions for baryon production in DIS are compared with data.

Paper Structure

This paper contains 6 sections, 2 equations, 3 figures, 1 table.

Table of Contents

  1. Introduction
  2. Baryon Production
  3. Diquark Jet Fragmentation
  4. The MOPS Program
  5. Subroutines
  6. Parameters and Switches

Figures (3)

  • Figure 1: A string with an original diquark can be assumed to have similar properties as a string remainder after an effective diquark break-up.
  • Figure 2: Two string segments A and B, causally connected by a common colour fluctuation quark pair.
  • Figure 3: Normalized Feynman-$x$ distribution of $\Lambda$ and $\Delta^{++}$ in $\pi^+$ p collisions at $\sim$20GeV cms energy. The meson is moving in the positive direction. Data from exp are compared to simulations with FRITIOF7.02 combined with JETSET default (solid lines) and modified with $\beta=0.6$GeV$^{-1}$ (dashed lines).