Search for squark production in events with jets, hadronically decaying tau leptons and missing transverse energy at sqrt(s)=1.96 TeV

TL;DR

This study searches for supersymmetric squark production in proton-antiproton collisions, focusing on events with jets, hadronic tau decays, and missing energy, setting new mass limits without finding evidence of new physics.

Contribution

It provides the first combined analysis of multijet events with tau leptons and missing energy at the Tevatron, setting new limits on squark and gaugino masses in specific SUSY models.

Findings

No evidence of supersymmetry was observed.

Lower mass limits for squarks up to 410 GeV were established.

Gaugino masses below 172 GeV are excluded.

Abstract

A search for supersymmetric partners of quarks is performed in the topology of multijet events accompanied by at least one tau lepton decaying hadronically and large missing transverse energy. Approximately 1 fb-1 of ppbar collision data from the Fermilab Tevatron Collider at a center of mass energy of 1.96 TeV recorded by the D0 detector is analyzed. Results are combined with the previously published D0 inclusive search for squarks and gluinos. No evidence of physics beyond the standard model is found and lower limits on the squark mass up to 410 GeV are derived in the framework of minimal supergravity with tan(beta)=15, A_0=-2m_0 and mu<0, in the region where decays to tau leptons dominate. Gaugino masses m_1/2 are excluded up to 172 GeV.