CMS reconstruction improvement for the muon tracking by the RPC chambers

TL;DR

This paper demonstrates that incorporating Resistive Plate Chamber (RPC) data into muon reconstruction in CMS enhances efficiency by up to 3% for muons with pT above 7 GeV/c, validated through data and simulation.

Contribution

It introduces an improved muon reconstruction method that integrates RPC information, leading to increased efficiency in CMS detector performance.

Findings

RPC data inclusion improves muon reconstruction efficiency by up to 3%.

The measured efficiencies agree well with Monte Carlo simulations.

The method is effective for muons with pT above 7 GeV/c.

Abstract

The contribution of Resistive Plate Chamber (RPC) to muon reconstruction in CMS has been studied on a sample of muons collected in proton-proton collisions at sqrt(s) = 7 TeV at the LHC in 2011. Muon reconstruction is performed using the all-silicon inner tracker and with up to four stations of gas-ionization muon detectors. Drift Tubes and Cathode Strip Chambers detect muons in the barrel and endcap regions, respectively, and are complemented by the RPC system. Measured distributions of reconstructed hits in the RPCs crossed by muons from Z decays with a transverse momentum pT above 20 GeV/c are well reproduced by the Monte Carlo simulation. From the samples of J/psi and Z events, the efficiencies for muons with and without the inclusion of the RPC hits in the muon track reconstruction are measured and compared with the simulation. Using RPC information in track reconstruction improves up to about 3% of offline reconstruction efficiency for the muons in the region of pT above 7 GeV/c, in good agreement with simulation.