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CIRCE Version 1.0: Beam Spectra for Linear Collider Physics

Thorsten Ohl

TL;DR

The paper addresses the challenge of incorporating beamstrahlung-induced beam spectra into linear-collider simulations by introducing CIRCE, a fast, reproducible parameterization framework. It proposes a factorized Beta-distribution model for $e^±$ and $\gamma$ beams, with endpoint-mapping techniques to handle integrable singularities, and provides a Fortran77 library (circe, circee, circeg, circgg) plus random-variate generators (girce and wrappers) for easy integration with MC event generators. Validation is anchored to full Guinea-Pig simulations and accelerator designs (S-Band, TESLA, X-Band) at representative energies like $\sqrt{s} = 500$ GeV and $1$ TeV, enabling quick cross-section and event-level studies while preserving physical constraints. The paper emphasizes reproducibility, portability, and practical usability, making the beam spectra readily accessible for simulations and benchmarking. Overall, CIRCE enables accurate, efficient inclusion of beamstrahlung effects in collider phenomenology without resorting to computationally expensive microscopic beam-dynamics runs.

Abstract

I describe parameterizations of realistic $e^\pm$- and $γ$-beam spectra at future linear $e^+e^-$-colliders. Emphasis is put on simplicity and reproducibility of the parameterizations, supporting reproducible physics simulations. The parameterizations are implemented in a library of distribution functions and event generators.

CIRCE Version 1.0: Beam Spectra for Linear Collider Physics

TL;DR

The paper addresses the challenge of incorporating beamstrahlung-induced beam spectra into linear-collider simulations by introducing CIRCE, a fast, reproducible parameterization framework. It proposes a factorized Beta-distribution model for and beams, with endpoint-mapping techniques to handle integrable singularities, and provides a Fortran77 library (circe, circee, circeg, circgg) plus random-variate generators (girce and wrappers) for easy integration with MC event generators. Validation is anchored to full Guinea-Pig simulations and accelerator designs (S-Band, TESLA, X-Band) at representative energies like GeV and TeV, enabling quick cross-section and event-level studies while preserving physical constraints. The paper emphasizes reproducibility, portability, and practical usability, making the beam spectra readily accessible for simulations and benchmarking. Overall, CIRCE enables accurate, efficient inclusion of beamstrahlung effects in collider phenomenology without resorting to computationally expensive microscopic beam-dynamics runs.

Abstract

I describe parameterizations of realistic - and -beam spectra at future linear -colliders. Emphasis is put on simplicity and reproducibility of the parameterizations, supporting reproducible physics simulations. The parameterizations are implemented in a library of distribution functions and event generators.

Paper Structure

This paper contains 5 sections, 11 equations, 2 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Parameters
  3. Usage
  4. Distributions
  5. Example

Figures (2)

  • Figure 1: Version 1, revision 1996 07 11 of the factorized $e^\pm$- and $\gamma$-distributions at $\sqrt s = 500\text{GeV}$ and $\sqrt s = 1\text{TeV}$ in a doubly logarithmic plot. The accelerator parameters are taken from table \ref{['tab:acc_param']}.
  • Figure 2: Version 1, revision 1996 07 11 of the factorized $e^\pm$- and $\gamma$-distributions for Tesla in a doubly logarithmic plot. The accelerator parameters are taken from table \ref{['tab:acc_param/Tesla']}.