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Study of electron pairs below the Z0 mass produced in pp collisions at √s = 540 GeV

Physics Letters B 154:4 (1985) 338-346

Authors:

P Bagnaia, M Banner, R Battiston, P Bloch, K Borer, M Borghini, J Bürger, P Cenci, JC Chollet, AG Clark, C Conta, P Darriulat, L Di Lella, J Dines-Hansen, R Engelmann, L Fayard, M Fraternali, D Froidevaux, JM Gaillard, O Gildemeister, VG Goggi, C Gössling, B Hahn, H Hänni, JR Hansen, P Hansen, N Harnew, T Himel, P Jenni, O Kofoed-Hansen, E Lancon, M Livan, S Loucatos, B Madsen, P Mani, B Mansoulie, GC Mantovani, L Mapelli, B Merkel, R Møllerud, C Onions, G Parrour, F Pastore, H Plothow-Besch, M Polverel, JP Repellin, A Rothenberg, A Roussarie, G Sauvage, J Schacher, JL Siegrist, G Stimpfl, F Stocker, M Swartz, J Teiger, S Tovey, V Vercesi, AR Weidberg, H Zaccone, JA Zakrzewski, W Zeller

Abstract:

From an integrated luminosity of ∫Ldt = 116 nb-1, 10events are found which contain an electron pair of mass in the range 12 < Mee < 26 GeV c2 and electron transverse momenta pTe > 5 GeV c. THe sample are described, as well as some featruyres of the The production characteristics of this sample are described, as well as some features of the estimated to be 2.2±0.6 events. The production characteristics of this sample are described, as well as some features of the associated event topology. Comparisons are made with the expectations for such electron pair production from the Drell-Yan mechanism and from the semi-leptonic decay of heavy flavours. © 1985.
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New results on the reaction e+e---> micro+ micro- at sqrt s =29 GeV.

Phys Rev D Part Fields 31:9 (1985) 2352-2355

Authors:

M Derrick, E Fernandez, R Fries, L Hyman, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, S Ahlen, G Baranko, P Baringer, D Blockus, B Brabson, M Daigo, GE Forden, SW Gray, J Guillaud, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, J Chapman, D Errede, N Harnew, P Kesten, S Kooijman, DI Meyer, D Nitz, D Rubin, AA Seidl, R Thun, T Trinko, M Willutzky, I Beltrami, R DeBonte, KK Gan, D Koltick, FJ Loeffler, U Mallik, RL McIlwain, DH Miller, CR Ng, PP Ong, LK Rangan, EI Shibata, R Stevens, RJ Wilson, B Cork, L Keller, J Va'vra
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Observation of tau -lepton decay to five charged particles.

Phys Rev Lett 54:16 (1985) 1775-1778

Authors:

I Beltrami, BG Bylsma, R DeBonte, KK Gan, D Koltick, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, PP Ong, LK Rangan, EI Shibata, RJ Wilson, M Derrick, E Fernandez, R Fries, L Hyman, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, G Baranko, P Baringer, D Blockus, B Brabson, GE Forden, 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, S Kooijman, DI Meyer, D Nitz, D Rubin, AA Seidl, R Thun, T Trinko, W Willutzky, B Cork, L Keller, J Va'Vra
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Measurement of the reaction e+e- → τ+τ- at √s = 29 GeV

Physics Letters B 153:1-2 (1985) 116-120

Authors:

KK Gan, I Beltrami, BG Bylsma, R Debonte, D Koltick, FJ Loeffler, EH Low, RL McIlwain, DH Miller, CR Ng, PP Ong, LK Rangan, EI Shibata, RJ Wilson, M Derrick, E Fernandez, R Fries, L Hyman, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, G Baranko, P Baringer, D Blockus, B Brabson, GE Forden, 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, S Kooijman, DI Meyer, D Nitz, D Rubin, AA Seidl, R Thun, T Trinko, M Willutzky, B Cork, L Keller, J Va'vra

Abstract:

The reaction e+e- → τ+τ- has been measured using the high resolution spectrometer at PEP. The angular distribution shows a forward-backward asymmetry of -(6.1±2.3±0.5)%, corresponding to an axial-vector coupling if gaτgae = 0.28 ±0.11± 0.03, in good agreement with the standard model of electroweak interactions. The measured cross section yields ifRττ = 1.10± 0.03±0.04, consistent with QED and giving QED cutoff parameters of Λ+>92 GeV and Λ->246 GeV at 95% C.L. © 1985.
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New results on the reaction e+e-→μ+μ- at s =29 GeV

Physical Review D 31:9 (1985) 2352-2355

Authors:

M Derrick, E Fernandez, R Fries, L Hyman, P Kooijman, JS Loos, B Musgrave, LE Price, J Schlereth, K Sugano, JM Weiss, DE Wood, S Ahlen, G Baranko, P Baringer, D Blockus, B Brabson, M Daigo, GE Forden, SW Gray, JP Guillaud, C Jung, H Neal, H Ogren, DR Rust, M Valdata-Nappi, C Akerlof, J Chapman, D Errede, N Harnew, P Kesten, S Kooijman, DI Meyer, D Nitz, D Rubin, AA Seidl, R Thun, T Trinko, M Willutzky, I Beltrami, R Debonte, KK Gan, D Koltick, FJ Loeffler, U Mallik, RL McIlwain, DH Miller, CR Ng, PP Ong, LK Rangan, EI Shibata, R Stevens, RJ Wilson, B Cork, L Keller, J Va'Vra

Abstract:

We have measured the process e+e-→μ+μ- at s =29 GeV using the High Resolution Spectrometer at SLAC PEP. The forward-backward charge asymmetry is Aμμ=-(4.9±1.5±0.5)% based on 5057 events. A subsample of 3488 μ+μ- events in the angular range cosθ<0.55 gives a cross-section ratio of Rμμ=0.990±0.017±0.030. The resulting couplings of the weak neutral current are gaegaμ=0.208±0.064± 0.021 and gvegvμ=0.027 ±0.051±0.089. The QED cutoff parameters are Λ+>170 GeV and Λ->146 GeV at 95% C.L. © 1985 The American Physical Society.
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