A measurement of muon pair production in e+e- annihilation at centre of mass energies 35.0≤ {Mathematical expression}≤46.8 GeV
- Braunschweig, W
- Gerhards, R
- Kirschfink, FJ
- Martyn, H-U
- Bock, B
- Fischer, HM
- Hartmann, H
- Hartmann, J
- Hilger, E
- Jocksch, A
- Wedemeyer, R
- Foster, B
- Martin, AJ
- Sephton, AJ
- Bernardi, E
- Chwastowski, J
- Eskreys, A
- Gather, K
- Genser, K
- Hultschig, H
- Joos, P
- Kowalski, H
- Ladage, A
- Löhr, B
- Lüke, D
- Mättig, P
- Notz, D
- Pawlak, JM
- Pösnecker, K-U
- Ros, E
- Trines, D
- Walczak, R
- Wolf, G
- Kolanoski, H
- Kracht, T
- Krüger, J
- Lohrmann, E
- Poelz, G
- Zeuner, W
- Hassard, J
- Shulman, J
- Su, D
- Barreiro, F
- Hervas, L
- Leites, A
- del Peso, J
- Traseira, M
- Balkwill, C
- Bowler, MG
- Burrows, PN
- Cashmore, RJ
- Hawkes, CM
- Heath, GP
- Ratoff, PN
- Silvester, IM
- Tomalin, IR
- Veitch, ME
- Forden, GE
- Hart, JC
- Saxon, DH
- Brandt, S
- Holder, M
- Labarga, L
- Duchovni, E
- Eisenberg, Y
- Karshon, U
- Mikenberg, G
- Montag, A
- Revel, D
- Ronat, E
- Wainer, AN
- Yekutieli, G
- Muller, D
- Ritz, S
- Strom, D
- Takashima, M
- Wu, SL
- Zobernig, G
DOIAbstract
The reaction e+e-→μ+μ- has been studied at centre of mass energies between 35.0 and 46.8 GeV using the TASSO detector at PETRA. We present measurements of the forward-backward charge asymmetry (Aμμ) and cross section σμμ for this reaction at three energies. At 35.0 GeV we obtain a cross section relative to the QED prediction of Rμμ=σμμ/σo=0.932±0.018±0.044 and Aμμ=(-10.6-2.3+2.2±0.5)%. At 38.3 GeV we find Rμμ=0.951±0.072-0.057+0.063 and Aμμ=(+1.7-8.6+8.5±0.5)%. At 43.6 GeV we measure Rμμ=0.921±0.037±0.055 and Aμμ=(-17.6-4.3+4.4±0.5)%. Our results are in good agreement with the predictions of the standard model. Including previous TASSO data we present improved determinations of muonic electroweak parameters. We also report on lower limits o...