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<b>Abstract</b>— <p>The Compact Muon Solenoid (CMS) experiment has an extensive physics program in the proton–proton collision mode, which provides for both verification of the Standard Model using a new energy scale starting from 1 TeV, and searching for new physics objects and phenomena beyond it. Inside the dilepton channel where the search for new physics is currently underway, the established limits on invariant masses of dileptons can reach several TeV. At high energies, one of the problems of searching for new heavy resonances <i>Z</i> ' deals with presence of background processes generating muons. The photon-induced background is one of these processes that occurs in addition to the main Drell–Yan background process. Dimuons produced from these muons can be misinterpreted as candidates for heavy resonances making the task of eliminating the backgrounds even more urgent. We address this issue by analyzing processes of selecting and reducing backgrounds. The approach is described below together with results of estimating cross sections of background processes in the scope of analysis to search for heavy neutral resonances <i>Z</i> ′ using the Monte Carlo simulation method involving FEWZ generator.</p>

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Selecting and Modeling Background Events in the Dimuon Channel in the CMS Experiment

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • I. Zhizhin,
  • A. Lanev,
  • S. Shmatov

摘要

Abstract—

The Compact Muon Solenoid (CMS) experiment has an extensive physics program in the proton–proton collision mode, which provides for both verification of the Standard Model using a new energy scale starting from 1 TeV, and searching for new physics objects and phenomena beyond it. Inside the dilepton channel where the search for new physics is currently underway, the established limits on invariant masses of dileptons can reach several TeV. At high energies, one of the problems of searching for new heavy resonances Z ' deals with presence of background processes generating muons. The photon-induced background is one of these processes that occurs in addition to the main Drell–Yan background process. Dimuons produced from these muons can be misinterpreted as candidates for heavy resonances making the task of eliminating the backgrounds even more urgent. We address this issue by analyzing processes of selecting and reducing backgrounds. The approach is described below together with results of estimating cross sections of background processes in the scope of analysis to search for heavy neutral resonances Z ′ using the Monte Carlo simulation method involving FEWZ generator.