Searches for scalar top and scalar bottom quarks in e+e- interactions at 161 GeV ≤ √s ≤ 183 GeV

• Autores: Dova, María Teresa; L3 Collaboration
• Año de publicación: 1999
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; Física; quarks in e+e-; L3 detector; minimal supersymmetric extension
• Institución: Universidad Nacional de La Plata

Searches for scalar top and scalar bottom quarks have been performed at center-of-mass energies between 161 GeV and 183 GeV using the L3 detector at LEP. No signal is observed. Model-independent limits on production cross sections are determined for the two decay channels $\text{t}\text{̃}{}_1$→c$\text{χ}\text{̃}{}_1{}^0$ and $\text{b}\text{̃}{}_1$→b$\text{χ}\text{̃}{}_1{}^0$. Within the framework of the Minimal Supersymmetric extension of the Standard Model mass limits are derived. For mass differences between $\text{t}\text{̃}{}_1$ and $\text{χ}\text{̃}{}_1{}^0$ greater than 10 GeV a 95% C.L. limit of 81.5 GeV is set on the mass of the Supersymmetric partner of the left-handed top. A supersymmetric partner of the left-handed bottom with a mass below 80 GeV is excluded at 95% C.L. if the mass difference between $\text{b}\text{̃}{}_1$ and $\text{χ}\text{̃}{}_1{}^0$ is greater than 20 GeV.
Facultad de Ciencias Exactas