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Test of QED to fourth order by study of four-lepton final states in e+e- interactions at 29 GeV with the Mark II detector.

  • Author(s): Petradza, M;
  • Thun, R;
  • Abrams, G;
  • Amidei, D;
  • Baden, AR;
  • Barklow, T;
  • Boyarski, A;
  • Boyer, J;
  • Burchat, PR;
  • Burke, DL;
  • Butler, F;
  • Dorfan, JM;
  • Feldman, GJ;
  • Gidal, G;
  • Gladney, L;
  • Gold, MS;
  • Goldhaber, G;
  • Haggerty, J;
  • Jaros, JA;
  • Kadyk, JA;
  • Karlen, D;
  • Lankford, AJ;
  • Larsen, RR;
  • LeClaire, BW;
  • Levi, ME;
  • Lockyer, NS;
  • Lüth, V;
  • Nelson, ME;
  • Ong, RA;
  • Perl, ML;
  • Richter, B;
  • Riles, K;
  • Rowson, PC;
  • Schaad, T;
  • Schellman, H;
  • Schmidke, WB;
  • Sheldon, PD;
  • Trilling, GH;
  • Wood, DR;
  • Yelton, JM
  • et al.
Abstract

We have tested QED to fourth order in the coupling constant in the large-Q2 region by studying four-lepton final states in e+e- interactions with the Mark II detector at the SLAC storage ring PEP (s=29 GeV). All four final-state particles were detected at large angles with respect to the beam axis. For an integrated luminosity of 205 pb-1, we observed ten e+e-e+e-, ten e+e-+-, and one events with opposite-charge pair masses greater than 1 GeV/c2. These events show good agreement with the complete 4 QED calculation. © 1990 The American Physical Society.

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