AMY
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MEASUREMENTS OF THE CROSS-SECTION FOR e+ e- ---> gamma gamma at TRISTAN

The AMY collaboration Kim, H.J. ; Kang, J.S. ; Lee, M.H. ; et al.
KEK-Preprint-89-52, 1989.
Inspire Record 280029 DOI 10.17182/hepdata.38418

None

1 data table
Table 1

No description provided.


rivet Analysis
Charged hadron multiplicities in e+ e- annihilations at s**(1/2) = 50-GeV - 61.4-GeV

The AMY collaboration Zheng, H.W. ; Perez, P. ; Auchincloss, Priscilla S. ; et al.
Phys.Rev.D 42 (1990) 737-747, 1990.
Inspire Record 295160 DOI 10.17182/hepdata.22922

We present the charged-particle multiplicity distributions for e+e− annihilation at center-of-mass energies from 50 to 61.4 GeV. The results are based on a data sample corresponding to a total integrated luminosity of 30 pb−1 obtained with the AMY detector at the KEK storage ring TRISTAN. The charged-particle multiplicity distributions deviate significantly from the modified Poisson and pair Poisson distributions, but follow Koba-Nielsen-Olesen scaling and are well reproduced by the LUND parton-shower model.

2 data tables
Table 1

Fully corrected charged particle multiplicity distributions. Errors for n=2 and 4 are systematic only since these were derived using the LUND 6.3 Monte Carlo normalized to the observations at higher n values.

Table 2

No description provided.


rivet Analysis
MEASUREMENTS OF R FOR e+ e- ANNIHILATION AT TRISTAN

The AMY collaboration Kumita, T. ; Sagawa, H. ; Auchincloss, Priscilla S. ; et al.
Phys.Rev.D 42 (1990) 1339-1349, 1990.
Inspire Record 294525 DOI 10.17182/hepdata.22908

The ratio R of the total cross section for e+e− annihilation into hadrons to the lowest-order QED cross section for e+e−→μ+μ− has been measured for center-of-mass energies ranging from 50 to 61.4 GeV. If we allow for an overall shift of —4.9%, about 1.5 times our estimated normalization error, the results are consistent with the standard-model predictions.

1 data table
Table 1

Error quoted contains point-to-point systematics. There is also an additional 3.2 pct systematic error.