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Lambda production in e+e- annihilations at 29 GeV: Comparison with Lund-model predictions.

Phys Rev Lett 56:13 (1986) 1346-1349

Authors:

P Baringer, S Abachi, C Akerlof, I Beltrami, D Blockus, G Bonvicini, B Brabson, JM Brom, BG Bylsma, J Chapman, B Cork, R DeBonte, M Derrick, M Daigo, D Errede, KK Gan, SW Gray, J Guillaud, N Harnew, C Jung, P Kesten, D Koltick, P Kooijman, FJ Loeffler, JS Loos, EH Low, RL McIlwain, DI Meyer, DH Miller, B Musgrave, H Neal, D Nitz, CR Ng, H Ogren, LE Price, LK Rangan, DR Rust, J Schlereth, AA Seidl, EI Shibata, K Sugano, R Thun, T Trinko, M Valdata-Nappi, JM Weiss, M Willutzky, DE Wood
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Upper limit on the tau-neutrino mass.

Phys Rev Lett 56:10 (1986) 1039-1042

Authors:

S Abachi, C Akerlof, P Baringer, I Beltrami, D Blockus, G Bonvicini, B Brabson, BG Bylsma, J Chapman, B Cork, R DeBonte, M Derrick, D Errede, KK Gan, SW Gray, N Harnew, C Jung, P Kesten, D Koltick, P Kooijman, FJ Loeffler, JS Loos, EH Low, RL McIlwain, DI Meyer, DH Miller, B Musgrave, H Neal, D Nitz, CR Ng, H Ogren, LE Price, LK Rangan, DR Rust, J Schlereth, AA Seidl, EI Shibata, K Sugano, R Thun, T Trinko, M Valdata-Nappi, JM Weiss, M Willutzky, DE Wood
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Rapidity dependence of the charged particle multiplicity distributions in e+e- annihilation at 29 GeV

Physics Letters B 168:3 (1986) 299-304

Authors:

M Derrick, KK Gan, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, D Blockus, B Brabson, SW Gray, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, G Bonvicini, J Chapman, D Errede, N Harnew, P Kesten, DI Meyer, D Nitz, AA Seidl, R Thun, T Trinko, M Willutzky, S Abachi, P Baringer, I Beltrami, BG Bylsma, R Debonte, D Koltick, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, LK Rangan, EI Shibata, B Cork

Abstract:

The charged particle multiplicity distribution for e+e- annihilations at s = 29 GeV has been measured using the High Resolution Spectrometer at PEP. The multiplicity distribution, expressed as a function of the mean, shows KNO scaling when compared to e+e- data at other energies. Multiplicity distributions for particles selected in different central rapidity spans are presented. All of these are well presented by the Negative binomial distribution. As the rapidity span is narrowed, the distributions become broader and approach a constant value of the parameter k. © 1986.
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New results from Bhabha scattering at 29 GeV

Physics Letters B 166:4 (1986) 463-467

Authors:

M Derrick, KK Gan, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, D Blockus, B Brabson, SW Gray, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, G Bonvicini, J Chapman, D Errede, N Harnew, P Kesten, DI Meyer, D Nitz, AA Seidl, R Thun, T Trinko, M Willutzky, S Abachi, P Baringer, I Beltrami, BG Bylsma, R Debonte, D Koltick, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, LK Rangan, EI Shibata, B Cork

Abstract:

Results are reported on a high statistics study of Bhabha scattering at 29 GeV in the polar angle region, |cos θ| < 0.55. The data are consistent with the standard model, and measure vector and axial-vector coupling constants of gv2 = 0.03 ± 0.09 and ga2 = 0.46±0.14. Limits on the QED-cutoff parameters are Λ+ > 154 GeV and Λ- > 220 GeV. Lower limits on scale parameters of composite models are in the range 0.9-2.8 TeV. The partial width of a hypothetical spin-zero boson decaying to e+e- has an upper limit which varies from 6 to 57 MeV corresponding to a boson mass in the range 45-80 GeV/c2. © 1986.
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Precision test of QED by direct comparison of e+e- → γγ and e+e- → e+e- at 29 GeV

Physics Letters B 166:4 (1986) 468-472

Authors:

M Derrick, KK Gan, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, D Blockus, B Brabson, SW Gray, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, G Bonvicini, J Chapman, D Errede, N Harnew, P Kesten, DI Meyer, D Nitz, AA Seidl, R Thun, T Trinko, M Willutzky, S Abachi, P Baringer, I Beltrami, BG Bylsma, R Debonte, D Koltick, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, LK Rangan, EI Shibata, B Cork

Abstract:

The ratio of differential cross sections for the reactions e+e- → γγ and e+e- → e+e- is measured at s = 29 GeV in the central polar angle region, |cos θ| < 0.55, and compared to the same ratio calculated by QED to order α3. The ratio of these ratios, integrated over this angular region, is 1.007±0.009±0.008, demonstrating excellent agreement between theory and experiment. The 95% confidence limits on the QED cut-off parameters for the γγ final state are Λ+ > 59 GeV and Λ- > 59 GeV. © 1986.
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