학술논문
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.
Document Type
article
Author
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
Source
Physical review. D, Particles and fields. 42(7)
Subject
Language
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.