Performance of e/$\gamma$-based Triggers at the CMS High Level Trigger

TL;DR

This paper evaluates the performance of electron/photon triggers at the CMS High Level Trigger, detailing algorithms, their efficiency, and planned improvements to optimize physics analysis without increasing false triggers.

Contribution

It presents the algorithms used for online e/$\gamma$ reconstruction at CMS HLT and assesses their performance and future enhancements.

Findings

Algorithms achieve high efficiency in electron/photon detection

Performance metrics meet CMS physics requirements

Planned improvements aim to enhance trigger accuracy

Abstract

The CMS experiment has been designed with a two-level trigger system: the Level 1 (L1) Trigger, implemented on custom-designed electronics, and the High Level Trigger (HLT), a streamlined version of the CMS reconstruction and analysis software running on a computer farm. In order to achieve a good rate reduction with as little as possible impact on the physics efficiency, the algorithms used at HLT are designed to follow as closely as possible the ones used in the offline reconstruction. Here, we will present the algorithms used for the online reconstruction of electrons and photons (e/$\gamma$), both at L1 and HLT, and their performance and the planned improvements of these HLT objects.