Search for New Physics in Jet Multiplicity Patterns of Multilepton Events at sqrt[s]=13  TeV

Area of Science:

• High Energy Physics
• Particle Physics
• Beyond Standard Model Physics

Background:

• The Standard Model (SM) of particle physics describes fundamental particles and forces.
• Searches for physics beyond the SM are crucial for understanding the universe's fundamental constituents.
• Multilepton events provide a rich signature for exploring new physics phenomena.

Purpose of the Study:

• To conduct a first search for physics beyond the Standard Model (BSM) using jet multiplicity patterns in multilepton events.
• To probe potential enhancements in jet production rates predicted by certain BSM theories, particularly those involving supersymmetry.
• To set limits on new physics scenarios by comparing observed data with SM predictions.

Main Methods:

• Analysis of a large dataset (138 fb⁻¹) of 13 TeV proton-proton collisions from the CMS detector at the LHC.
• Examination of jet multiplicity distributions in events with one, two, and four leptons.
• Focus on three-lepton events, with and without bottom quarks, to search for BSM signatures.
• Interpretation of results within the framework of supersymmetric models with R-parity violation.

Main Results:

• Observed jet multiplicity distributions in multilepton events are consistent with Standard Model expectations.
• No significant evidence for new physics beyond the Standard Model was found in this search.
• The data place constraints on supersymmetric scenarios involving electroweak chargino-neutralino superpartners and R-parity violating interactions.

Conclusions:

• The current data from the CMS experiment do not support the presence of the specific BSM physics searched for.
• The results exclude a portion of the parameter space for supersymmetric models with R-parity violating decays.
• Further searches with increased luminosity and refined analysis techniques are needed to explore other BSM scenarios.