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T: Teilchenphysik

T 304: Neue Ph
änomene III

T 304.2: Talk

Tuesday, March 11, 2003, 16:15–16:30, SFO3

Search for scalar quarks in e⁺e⁻ interactions — •Serge Sushkov and Thomas Hebbeker — Humboldt University, Berlin / III. Phys. Inst. A, RWTH Aachen

Final results of the search for scalar quarks in e⁺e⁻ interactions using the L3 experiment at the LEP Collider at CERN are presented. Data collected at center-of-mass energies from 202 up to 208 GeV are analysed. The squark production processes e⁺e⁻→ t_1 t_1 and e⁺e⁻→ b_1 b_1, followed by the decays t_1→ c χ₁⁰, t_1→ b l ν, t_1→ b τ ν, b_1→ b χ₁⁰ and t_1→ b W χ^0_1 are considered. No signal is observed and model-independent upper limits on the squark production cross sections are derived and interpreted as mass exclusion limits within the framework of the MSSM with conserved R-parity.