Elsevier

Physics Letters B

Volume 83, Issue 2, 7 May 1979, Pages 261-266
Physics Letters B

Properties of hadron final states in e+e− annihilation at 13 GeV and 17 GeV center of mass energies

https://doi.org/10.1016/0370-2693(79)90699-3Get rights and content

Abstract

We have observed e+e− hadrons at C.M. energies of 13 GeV and 17 GeV at PETRA using the TASSO detector. We find R(13 GeV) = 5.6 ± 0.7 and R(17 GeV) = 4.0 ± 0.7. The additional systematic uncertainty is 20%. Comparing inclusive charged hadron spectra we observe scaling between 5 GeV and 17 GeV for x = p/pbeam > 0.2; however the 13 GeV cross section is above the 17 GeV cross section for smaller x. This may be due to copious bb̄ production. The events become increasingly jet like at high energies as evidenced by a shrinking sphericity distribution with increasing energy.

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Cited by (0)

2

Supported by the Deutsches Bundesministerium für Forschung und Technologie.

1

Now at University Bochum, Germany.

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