Excluding light gluinos using four-jet LEP events: a next-to-leading order result

Abstract

Based upon a next-to-leading order perturbative calculation of the four-jet production rate in electron-positron annihilation and assuming 8 % for the theoretical error emerging from hadronization effects in the $0.002\le \ycut \le 0.004$ range for the Durham clustering algorithm, we exclude the existence of the light gluinos at the 95 % confidence level.

Figures (3)

• Figure 1: Group independent kinematical functions $C_i$ for QCD and QCD + light gluino theory.
• Figure 2: Full next-to-leading order and resummed-matched four-jet rate in QCD + ${N_{\rm lg}} = 0,1$ compared to ALEPH data.
• Figure 3: Renormalization scale dependence of the next-to-leading order prediction for the four-jet rate at $y_{\rm cut}=0.002$. The grey band indicates the value measured by ALEPH, corrected to hadron level.