Abstract
The design of the CMS detector is optimized for muon measurements. The muon system consists of gas ionization detector technologies. Cathode Strip Chambers (CSC) with both tracking and triggering capabilities are installed in the forward region. The first stage of muon reconstruction uses information from individual muon chambers and is thus called local reconstruction, in contrast to a subsequent global reconstruction where the information from all detectors is combined. First, 2-dimensional spatial points (rechits) describing where a muon crosses the CSC layers are built from the electrical signals induced by the charged particle traversing the chamber. Next, from the reconstructed hits, straight-line track segments are built within each chamber. Local reconstruction becomes particularly challenging at high instantaneous luminosities, which are expected at the HL-LHC. The high rate of particles traversing the detectors leads to increased rate of spurious rechits and segments thus increasing the combinatorial backgrounds. In this respect, work on improving the current and developing new algorithms is essential and is in progress. This document presents the existing local reconstruction algorithms used in the CMS cathode strip chambers. Their performance as well as ongoing efforts towards HL-LHC improvements are discussed.
Highlights
The Cathode Strip Chambers (CSC) provide precise tracking and triggering of muons in the forward region of CMS and constitute an essential part of the CMS muon measurements [1]
4.2 CSC spatial resolution For the measurement of the CSC spatial resolution, a data sample enriched in Z → μ+μ− events is used, and segments associated with reconstructed muons are selected
4.4 Segment properties and resolution Simulated data samples are used to study the properties and resolution of the segments reconstructed with the two algorithms
Summary
The Cathode Strip Chambers (CSC) provide precise tracking and triggering of muons in the forward region (endcap) of CMS and constitute an essential part of the CMS muon measurements [1]. An individual CSC consists of six layers of cathode strips and anode wires (Figure 2, left), each layer measuring the muon position in two coordinates, r-φ. A charged particle passing through the chamber and ionizing the gas volume, induces charges on the strips and wires (Figure 2, right). Local reconstruction takes place at the level of individual chambers and denotes the sequence of steps leading from raw data to the first-level reconstructed objects (rechits and segments), which serve as input to the muon track reconstruction [2]. Low CPU time per event and operational code robustnesss;itu with 36 chambers
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