Search for resonant second generation slepton production at the Fermilab Tevatron

Area of Science:

• Particle Physics
• Supersymmetry Searches
• High-Energy Physics

Background:

• Supersymmetry (SUSY) is a theoretical extension of the Standard Model.
• R-parity violation (RPV) provides a mechanism for SUSY particle interactions and decays.
• Smuons and sneutrinos are hypothetical SUSY partners of the muon and muon neutrino.

Purpose of the Study:

• To search for R-parity violating resonant production and decay of smuons and muon sneutrinos.
• To probe SUSY parameter space not accessible by previous experiments.
• To set limits on SUSY couplings and masses.

Main Methods:

• Analysis of 0.38 fb(-1) of integrated luminosity data collected by the D0 detector at the Fermilab Tevatron Collider.
• Searched for specific decay channels: smuon to neutralino plus muon, and sneutrino to charginos plus muon.
• Calculated 95% confidence level (C.L.) limits on slepton production cross-sections and branching fractions.

Main Results:

• Observed number of events is consistent with Standard Model background predictions.
• Established 95% C.L. limits on the product of slepton production cross-section and branching fraction to gaugino plus muon.
• Set limits on the RPV coupling parameter lambda(211)(') within the minimal supergravity framework.

Conclusions:

• The search found no evidence for R-parity violating supersymmetry in the studied channels.
• The results significantly extend previous limits from Run I of the Tevatron and the CERN LEP collider.
• Constrains specific SUSY models and provides guidance for future searches.