A measurement of muon pair production in $e^+e^-$ annihilation at centre of mass energies 35$\leq$ $\sqrt s$ $\leq$ 46.8 GeV

  • Braunschweig, W.
  • Gerhards, R.
  • Wedemeyer, R.
  • Foster, B.
  • Martin, A. J.
  • Sephton, A. J.
  • Bernardi, E.
  • Chwastowski, J.
  • Eskreys, A.
  • Gather, K.
  • Genser, K.
  • Hultschig, H.
  • Kirschfink, F. J.
  • Joos, P.
  • Kowalski, H.
  • Ladage, A.
  • L�hr, B.
  • L�ke, D.
  • M�ttig, P.
  • Notz, D.
  • Pawlak, J. M.
  • P�snecker, K. -U.
  • Ros, E.
  • Martyn, H. -U.
  • Trines, D.
  • Walczak, R.
  • Wolf, G.
  • Kolanoski, H.
  • Kracht, T.
  • Kr�ger, J.
  • Lohrmann, E.
  • Poelz, G.
  • Zeuner, W.
  • Hassard, J.
  • Bock, B.
  • Shulman, J.
  • Su, D.
  • Barreiro, F.
  • Hervas, L.
  • Leites, A.
  • Peso, J.
  • Traseira, M.
  • Balkwill, C.
  • Bowler, M. G.
  • Burrows, P. N.
  • Fischer, H. M.
  • Cashmore, R. J.
  • Hawkes, C. M.
  • Heath, G. P.
  • Ratoff, P. N.
  • Silvester, I. M.
  • Tomalin, I. R.
  • Veitch, M. E.
  • Forden, G. E.
  • Hart, J. C.
  • Saxon, D. H.
  • Hartmann, H.
  • Brandt, S.
  • Holder, M.
  • Labarga, L.
  • Duchovni, E.
  • Eisenberg, Y.
  • Karshon, U.
  • Mikenberg, G.
  • Montag, A.
  • Revel, D.
  • Ronat, E.
  • Hartmann, J.
  • Wainer, A. N.
  • Yekutieli, G.
  • Muller, D.
  • Ritz, S.
  • Strom, D.
  • Takashima, M.
  • Wu, Sau Lan
  • Zobernig, G.
  • TASSO Collaboration
  • Hilger, E.
  • Jocksch, A.
Publication date
January 1988
Publisher
Springer

Abstract

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 (A$_{μμ}$) and cross section σ$^{μμ}$ for this reaction at three energies. At 35.0 GeV we obtain a cross section relative to the QED prediction of R$_{μμ}$=σ$^{μμ}$/σ$^o$=0.932±0.018±0.044 and A$_{μμ}$=(−10.6−2.3+2.2±0.5)%. At 38.3 GeV we findRμμ=0.951±0.072$_{−0.057}$$^{+0.063}$ and A$_{μμ}$=(+1.7$_{−8.6}$$^{+8.5}$±0.5)%. At 43.6 GeV we measureRμμ=0.921±0.037±0.055 andAμμ=(−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 m...

Extracted data

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