Abstract
We present results from a study of hadronic event structure in high energy e+e− interactions using the L3 detector at LEP. A new class of event shape distributions are measured at and above the Z boson pole for light quark (u, d, s, c) flavours. Energy flow correlations are studied for all hadronic events. Next-to-leading-log QCD calculations and QCD models with improved leading-log approximations are compared to data and good agreement is found at the Z-pole whereas some discrepancies are observed at higher centre-of-mass energies.
Highlights
Total √s δ91.2 30◦ Detector 45◦ Detector 60◦ Detector 75◦ Detector197.0 30◦ Detector√s = 91.2 GeV τa (1/σ) · 0.0300−0.0400 0.0400−0.0500 0.0500−0.0600
Recently-proposed using 650 pb−1 of event data shape distributions collected by the L3 at √s = detector at LEP
These new event shape distributions are well described by different parton shower
Summary
The particle flow in hadronic e+e− annihilation events, with a nearly back-to-back configuration, is considered in two complementary regions Ω and Ωas shown in figure 1. The ‘angularity’ parameter τa defines a new type of event shape variable [13]. In order to obtain well-defined QCD predictions at the next-to-leading logarithmic levels for τa, only the range 1 > a > −1 is considered in Reference [13] and the present work. Within this range, variation of a controls the widths of the jets 1 and 2 in figure 1. The leading logarithmic contributions arise from radiation by the primary quarks of the e+e− annihilation process
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