Searches for Rare Light Meson Decays at CMS: Data Scouting Method

Shelby, Arlee

Undergraduate Honors Thesis

Searches for Rare Light Meson Decays at CMS: Data Scouting Method Public Deposited

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Citeable URL: https://scholar.colorado.edu/concern/undergraduate_honors_theses/pn89d8208

Abstract

The Compact Muon Solenoid (CMS), located at the Large Hadron Collider (LHC), aims to investigate particle phenomena in order to resolve experimental and theoretical discrepancies of the standard model at relativistic energies. The LHC is designed to reach collision energies above 13 TeV with rates of about 40 MHz. CMS employs a trigger system that reduces the event acceptance rate to less than 100 Hz, maximally restricted by storage capabilities. This reduction is ineffective in low energy QCD investigations of light mesons. The data scouting method is a proposed addition to the data acquisition system that reduces event selection requirements and stores reconstructed data, rather than raw data, in order to retain low energy light meson decays. It is proposed as a part of the L1 trigger upgrade, scheduled for 2029, which will include a tracker trigger. In this paper, the data scouting method is analyzed using two well known light meson decays from pile up and signal data sets. The analysis uses from position and momentum information from the tracker system at CMS, which will be available in conjunction with the L1 trigger upgrade. The method was found to be effective in background reduction, providing the method to be sensitive the particular rare light meson decays of interest. However, data used in this analysis only contain events of interest to each particular decay analyzed. In reality, data from CMS will have a much larger background contribution due to the large number of physics events observed at the LHC. Thus, the method was found to be inefficient from tracker data alone, but could be extended to use information from other parts of the CMS detector that have particle identification components.

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