Abstract

We report results of a search for the pair production of the lightest supersymmetric partner of the top quark, t˜1, using a data set corresponding to an integrated luminosity of 1 fb−1 collected by the DØ detector at a pp¯ center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider. Both scalar top quarks are assumed to decay into a b quark, a charged lepton and a scalar neutrino. The search is performed in the electron plus muon and dielectron final states. The signal topology consists of two isolated leptons, missing transverse energy, and jets. We find no evidence for this process and exclude regions of parameter space in the framework of the minimal supersymmetric standard model.

Highlights

  • Background contributions Z /γ ∗ → τ +τ − tt Diboson Instrumental Signal A Signal BThe integrated luminosity [18] of the eμ data sample is 1100 ± 67 pb−1

  • We find no evidence for this process and exclude regions of parameter space in the framework of the minimal supersymmetric standard model

  • In this Letter we present a search for scalar top pair production in a data sample corresponding to an integrated luminosity of 1 fb−1 collected at a center-of-mass energy of 1.96 TeV with the DØ detector during Run II of the Fermilab Tevatron p pcollider

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Summary

DØ Collaboration

We report results of a search for the pair production of the lightest supersymmetric partner of the top quark, t1, using a data set corresponding to an integrated luminosity of 1 fb−1 collected by the DØ detector at a p pcenter-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider. Data samples dominated by instrumental background are selected by inverting the muon isolation requirements or the electron-likelihood cut (eμ channel) or both electronlikelihood criteria (ee channel). An exponential fit is performed to the /E T distribution in the range /E T < 35 GeV, after subtraction of the MC estimates of the noninstrumental backgrounds, in events containing one electron and one muon.

The rapidity y is defined as y
Findings
Signal B
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