Fast simulation of detector effects in Rivet

TL;DR

This paper presents a fast, flexible method for simulating detector effects within Rivet, enabling more efficient analysis of physics data with customizable detector bias emulation.

Contribution

It introduces a C++ based detector-bias emulation framework in Rivet, including standard functions for LHC experiments and a tuned jet substructure smearing approach.

Findings

Accurately reproduces jet substructure biases observed by ATLAS.

Allows detector effects to be specified within analysis routines.

Provides standard detector functions for ATLAS and CMS data.

Abstract

We describe the design and implementation of detector-bias emulation in the Rivet MC event analysis system. Implemented using C++ efficiency and kinematic smearing functors, it allows detector effects to be specified within an analysis routine, customised to the exact phase-space and reconstruction working points of the analysis. A set of standard detector functions for the physics objects of Runs 1 and 2 of the ATLAS and CMS experiments is also provided. Finally, as jet substructure is an important class of physics observable usually considered to require an explicit detector simulation, we demonstrate that a smearing approach, tuned to available substructure data and implemented in Rivet, can accurately reproduce jet-structure biases observed by ATLAS.