Kinematic and vertex fitting package for the CMD-3 experiment

TL;DR

This paper introduces a new kinematic and vertex fitting software package designed for the CMD-3 experiment, with potential applicability to other e+e- experiments, including future projects like the Super Charm-Tau factory.

Contribution

The paper presents a detailed fitting algorithm, parametrization methods, and validation results, advancing the development of a versatile fitting package for particle physics experiments.

Findings

Successful testing with Monte Carlo simulated events

Validation using Gaussian simulation examples

Potential for adaptation to other e+e- experiments

Abstract

In this article, we discuss a new software package of kinematic and vertex fitting for the CMD-3 experiment at the VEPP-2000 electron-positron collider. The authors describe in detail the fitting algorithm, parametrization of four-momenta and trajectories of various particles and present the results of testing the fitting package using events of Monte Carlo simulation of various $e^+e^-$ annihilation processes. The authors also provide several examples of the fitting package validation using Gaussian simulation. Although the package discussed in this article is intended for the CMD-3 experiment, it can also be used in other experiments. The authors consider the described package as their first step towards a more universal and rigrous kinematic and vertex fitting package that can be used in future $e^+e^-$ experiments, such as the Super Charm-Tau factory.