GollumFit: An IceCube Open-Source Framework for Binned-Likelihood Neutrino Telescope Analyses

TL;DR

GollumFit is an open-source software framework that enables efficient binned-likelihood analyses of neutrino telescope data, specifically tailored for IceCube, supporting complex parameter fitting and likelihood minimization.

Contribution

It introduces a novel, time-efficient framework that incorporates neutrino telescope-specific model parameters for likelihood analyses, enhancing analysis capabilities.

Findings

Supports fitting over tens of nuisance parameters

Demonstrates efficient likelihood minimization

Provides user-friendly examples for analysis tasks

Abstract

We present GollumFit, a framework designed for performing binned-likelihood analyses on neutrino telescope data. GollumFit incorporates model parameters common to any neutrino telescope and also model parameters specific to the IceCube Neutrino Observatory. We provide a high-level overview of its key features and how the code is organized. We then discuss the performance of the fitting in a typical analysis scenario, highlighting the ability to fit over tens of nuisance parameters. We present some examples showing how to use the package for likelihood minimization tasks. This framework uniquely incorporates the particular model parameters necessary for neutrino telescopes, and solves an associated likelihood problem in a time-efficient manner.