Measurements of the <math><mtext>b</mtext><mtext>b</mtext><mtext>̄</mtext></math> production cross section and forward–backward asymmetry at centre-of-mass energies above the Z pol...

• Autores: Dova, María Teresa; L3 Collaboration
• Año de publicación: 2000
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; bb production; forward-backward asymmetry; centre-of-mass energies; Física
• Institución: Universidad Nacional de La Plata

The measurements of $\text{R}{}_{\mathrm{<mtext>b</mtext>}}\text{=σ(}\text{e}{}^{\mathrm{+}}\text{e}{}^{\mathrm{-}}\text{→}\text{b}\text{b}\text{̄}\text{)/σ(}\text{e}{}^{\mathrm{+}}\text{e}{}^{\mathrm{-}}\text{→}\text{q}\text{q}\text{̄}\text{)}$ and of the b quark forward–backward charge asymmetry, Abfb, at centre-of-mass energies above the Z pole are described. The measurement of Rb is performed at 's between 130 and 189 GeV using a b-tagging method that exploits the relatively large decay length of b-hadrons. The measurement of Ab is fb performed using the large statistics event sample collected at 's s189 GeV with a lepton-tag analysis based on the selection ' b of prompt muons and electrons. The results at s =189 GeV are $\text{R}{}_{\mathrm{<mtext>b</mtext>}}\text{=0.163±0.013}\text{(stat.)}\text{±0.005}\text{(syst.)}$, $\text{A}{}_{\mathrm{<mtext>fb</mtext>}}{}^{\mathrm{<mtext>b</mtext>}}\text{=0.61±0.18}\text{(stat.)}\text{±0.09}\text{(syst.)}$
Facultad de Ciencias Exactas