# SpecBit, DecayBit and PrecisionBit: GAMBIT modules for computing mass spectra, particle decay rates and precision observables

## TL;DR

This paper introduces GAMBIT modules SpecBit, DecayBit, and PrecisionBit, which enable seamless integration of spectrum generators, decay codes, and precision observable calculations for comprehensive particle physics analyses.

## Contribution

The paper presents a modular framework that links various computational tools for particle physics, allowing flexible, consistent, and automated calculations within GAMBIT.

## Key findings

- Modules enable automatic combination of existing codes
- Results are presented in a unified, accessible format
- The framework supports comprehensive global fits in particle physics

## Abstract

We present the GAMBIT modules SpecBit, DecayBit and PrecisionBit. Together they provide a new framework for linking publicly available spectrum generators, decay codes and other precision observable calculations in a physically and statistically consistent manner. This allows users to automatically run various combinations of existing codes as if they are a single package. The modular design allows software packages fulfilling the same role to be exchanged freely at runtime, with the results presented in a common format that can be easily passed to downstream dark matter, collider and flavour codes. These modules constitute an essential part of the broader GAMBIT framework, a major new software package for performing global fits. In this paper we present the observable calculations, data, and likelihood functions implemented in the three modules, as well as the conventions and assumptions used in interfacing them with external codes. We also present 3-BIT-HIT, a command-line utility for computing mass spectra, couplings, decays and precision observables in the MSSM, which shows how the three modules can be easily used independently of GAMBIT.