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Search for R-parity violating supersymmetry in two-muon and four-jet topologies.

V M Abazov¹, B Abbott, A Abdesselam

¹Joint Institute for Nuclear Research, Dubna, Russia.

Physical Review Letters

|October 26, 2002

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Summary

Researchers searched for R-parity-violating decay of the lightest supersymmetric particle (neutralino chi01) into a muon and two jets. No events were observed, leading to new limits on supersymmetric particle masses.

Area of Science:

Particle Physics
Supersymmetry Searches

Background:

R-parity violation in supersymmetry models allows for lepton-number violating processes.
The neutralino (chi01) is a candidate for the lightest supersymmetric particle.

Purpose of the Study:

To search for the R-parity-violating decay of the neutralino chi01 into a muon and two jets.
To set limits on squark and gluino masses within the minimal low-energy supergravity-supersymmetry model.

Main Methods:

Analysis of 77.5+/-3.9 pb(-1) of data from pp collisions at sqrt[s]=1.8 TeV collected by the D0 experiment.
Searched for events consistent with the decay chi01 -> mu + jet + jet.

Main Results:

No candidate events were observed for the targeted decay channel.

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An expected background of 0.18+/-0.03+/-0.02 events was calculated.

Conclusions:

The absence of signal events allows for the exclusion of certain parameter space in supersymmetric models.
New limits are placed on squark and gluino masses based on the non-observation of the decay.