Electromagnetic secondaries and punch-through effects in the CMS ME1/1

I Belotelov ,K P Moissenz,V V Khabarov,V Palichik ,S Khabarov ,A Golunov ,A Kamenev ,S Movchan ,P Moissenz ,D Smolin ,S Shmatov ,V Karjavin ,N Gorbunov ,I Golutvin ,V Perelygin ,Yu.t Kiryushin ,G Mescheryakov ,A Zarubin

doi:10.1134/s1547477107040097

I Belotelov , K P Moissenz + Show 16 more

Open Access

https://doi.org/10.1134/s1547477107040097

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Abstract

The aim of this work is to estimate the shower leakage from the CMS Endcap Hadron calorimeter (HE) due to electromagnetic secondaries and punch-through in the region of the ME1/1 Forward Muon Station. Two configurations are considered: with and without the CMS Endcap Electromagnetic calorimeter (EE). The experimental data have been taken during the combined beam test of CMS subdetectors (HE, ME, RPC, DT) at the CERN H2 beam facility in 2004. Serial CSC chambers (ready for installation in CMS) fully equipped with readout electronics have been exposed. Simulation of a beam test setup has been performed using the GEANT4-based simulation software package OSCAR.

Highlights

The cathode strip chambers (CSCs) are devoted to the measurement of muon spatial coordinates in the Endcap muon stations of the CMS experiment [1]
In this note an estimate of the shower leakage in the ME1/1 region of the CMS detector is done analysing experimental data taken in the combined beam test of ME1/1 and Hadron calorimeter (HE) at the CERN H2 beam facility in 2004
This study provided the fraction of events corresponding to the two configurations

Summary

Introduction

The cathode strip chambers (CSCs) are devoted to the measurement of muon spatial coordinates in the Endcap muon stations of the CMS experiment [1]. In order to achieve the required momentum resolution the CSCs of the Forward Muon Station ME1/1 should provide high spatial resolution (~150 μm per layer). The ME1/1 station is located behind the electromagnetic and hadron calorimeters (EE+HE). High energy muons and pions passing through calorimeters produce a significant number of the secondary particles in the region of ME1/1 which can lower spatial resolution [4] and track reconstruction efficiency [5] of detectors. To study the punch-through effect two experimental configurations were considered – with and without the EE (as possible startup scenario for the CMS Endcap) located in front of the HE. This study provided the fraction of events corresponding to the two configurations

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Conclusion