Performance of the CMS Hadron Calorimeter with Cosmic Ray Muons and LHC Beam Data

TL;DR

This paper reports on the commissioning and performance evaluation of the CMS Hadron Calorimeter using cosmic ray muons and LHC beam data, including calibration and energy response assessments.

Contribution

It provides a comprehensive analysis of the CMS HCAL performance with cosmic rays and beam data, validating calibration and energy response post-installation.

Findings

Calibration parameters successfully extracted

Energy response consistent with test beam data

HCAL performance verified underground and during beam runs

Abstract

The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and the energy response of the HCAL determined from test beam data has been checked.