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

Journal Article · Sun Sep 30 20:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.2171· OSTI ID:6227698

Petradza, M; Thun, R; Abrams, G; Amidei, D; Baden, A R; Barklow, T; Boyarski, A; Boyer, J; Burchat, P R; Burke, D L; Butler, F; Dorfan, J M; Feldman, G J; Gidal, G; Gladney, L; Gold, M S; Goldhaber, G; Haggerty, J; Jaros, J A; Kadyk, J A ; Karlen, D; Lankford, A J; Larsen, R R; LeClaire, B W; Levi, M E; Lockyer, N S; Lueth, V; Nelson, M E; Ong, R A; Perl, M L; Richter, B; Riles, K; Rowson, P C; Schaad, T; Schellman, H; Schmidke, W B; Sheldon, P D; Trilling, G H; Wood, D R; Yelton, J M ^[1]

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1. Lawrence Berkeley Laboratory, Berkeley, CA (USA) Department of Physics, University of California, Berkeley, CA (USA) Harvard University, Cambridge, MA (USA) University of Michigan, Ann Arbor, MI (USA) Stanford Linear Accelerator Center, Stanford University, Stanford, CA (USA)

We have tested QED to fourth order in the coupling constant {alpha} in the large-{ital Q}{sup 2} region by studying four-lepton final states in {ital e}{sup +}{ital e}{sup {minus}} interactions with the Mark II detector at the SLAC storage ring PEP ({radical}{ital 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{sup {minus}1}, we observed ten {ital e}{sup +}{ital e}{sup {minus}}{ital e+}{ital e}{sup {minus}}, ten {ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}}, and one {mu}{sup +}{mu}{sup {minus}}{mu}{sup +}{mu}{sup {minus}} events with opposite-charge pair masses greater than 1 GeV/{ital c}{sup 2}. These events show good agreement with the complete {alpha}{sup 4} QED calculation.

• DOE Contract Number: AC03-76SF00098; AC02-76ER03064; AC02-76ER01112; AC03-76SF00515
• OSTI ID: 6227698
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:7; ISSN 0556-2821; ISSN PRVDA
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BREMSSTRAHLUNG
COUPLING CONSTANTS
DIAGRAMS
DRIFT CHAMBERS
ELECTRODYNAMICS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FEYNMAN DIAGRAM
FIELD THEORIES
GEV RANGE
GEV RANGE 10-100
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MEASURING INSTRUMENTS
MONTE CARLO METHOD
MULTIWIRE PROPORTIONAL CHAMBERS
MUONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PEP STORAGE RINGS
PROPAGATOR
PROPORTIONAL COUNTERS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
RADIATION DETECTORS
RADIATIONS
STORAGE RINGS
TESTING