Track finding in gamma conversions in CMS

TL;DR

This paper presents a new track finding algorithm in CMS that combines calorimeter and tracker data to improve the reconstruction of gamma conversion events, demonstrating efficiency and fake rate performance under high-luminosity conditions.

Contribution

It introduces a novel algorithm integrating calorimeter and tracker information for gamma conversion tracking in CMS, enhancing reconstruction accuracy.

Findings

High reconstruction efficiency for converted photons.

Effective discrimination between real and fake conversions.

Robust performance under high pile-up conditions.

Abstract

A track finding algorithm has been developed for reconstruction of e+e- pairs. It combines the information of the electromagnetic calorimeter with the information provided by the Tracker. Results on reconstruction efficiency of converted photons, as well as on fake rate are shown for single isolated photons and for photons from H->gamma gamma events with pile-up events at 10^33 cm^-2 s^-1 LHC luminosity.