Abstract
We present data on energy-energy correlations (EEC) and their related asymmetry (AEEC) ine + e − annihilation in the centre of mass energy range 12<W≦46.8 GeV. The energy and angular dependence of the EEC in the central region is well described byOα 2 s QCD plus a fragmentation term proportional to\({1 \mathord{\left/ {\vphantom {1 {\sqrt s }}} \right. \kern-\nulldelimiterspace} {\sqrt s }}\). BareO(α) 2 s QCD reproduces our data for the large angle region of the AEEC. Nonperturbative effects for the latter are estimated with the help of fragmentation models. From various analyses using different approximations, we find that values for\(\Lambda _{\overline {MS} } \) in the range 0.1–0.3 GeV give a good description of the data. We also compare analytical calculations in QCD for the EEC in the back-to-back region to our data. The theoretical predictions describe well both the angular and energy dependence of the data in the back-to-back region.
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Supported by the Alexander von Humboldt Stiftung
Supported by Bundesministerium für Forschung und Technologie
Supported by UK Science and Engineering Research Council
Supported by CAICYT
Supported by the Minerva Gesellschaft für Forschung GmbH
Supported by US Dept. of Energy, contract DE-AC02-76ER000881 and by US Nat. Sci. Foundation Grant no INT-8313994 for travel
Supported by a Research Grant from the Ministry of Science and Research of Northrhine-Westphalia
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The TASSO Collaboration., Braunschweig, W., Gerhards, R. et al. A study of energy-energy correlations between 12 and 46.8 GeV c.m. energies. Z. Phys. C - Particles and Fields 36, 349–361 (1987). https://doi.org/10.1007/BF01573928
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DOI: https://doi.org/10.1007/BF01573928