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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.

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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