Direct electron-pair production in. pi. /sup + -/p interactions at 18 GeV/c

Journal Article · Mon Oct 30 04:00:00 EST 1978 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.41.1207· OSTI ID:6578061

Ballam, J; Bouchez, J; Carroll, J T; Chadwick, G B; Chaloupka, V; Field, R C; Freytag, D R; Lewis, R A; Moffeit, K C; Stevens, R A; Band, H; Fortney, L R; Glanzman, T; Loos, J S; Robertson, W J; Walker, W D; Baker, P A; Dornan, P J; Gibbs, D J; Hall, G ; White, A P; Virdee, T S

With use of the Stanford Linear Accelerator Center hybride facility 1-m bubble chamber fitted with tantalum plates, a measurement was made of direct unexplained e/sup +/e/sup -/ pair production in 18-GeV/c ..pi../sup + -/p interactions. Limits are set in ..pi../sup +/p processes. In ..pi../sup -/p a signal is observed which cannot be caused by eta, ..omega.., or rho decay, and for masses > m/sub ..pi../0, e/sup + -/ /..pi../sup + -/ = (0.87 +- 0.25) x 10/sup -4/. Some properties of the events are discussed.

• Research Organization: Stanford Linear Accelerator Center, Stanford, California 94305
• OSTI ID: 6578061
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 41:18; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BUBBLE CHAMBERS
CROSS SECTIONS
DECAY
ELECTRON PAIRS
ENERGY RANGE
GAMMA SPECTRA
GAS TRACK DETECTORS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
INTERACTIONS
LINEAR ACCELERATORS
MASS SPECTRA
MEASURING INSTRUMENTS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MULTIPLICITY
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE INTERACTIONS
PION MINUS-PROTON INTERACTIONS
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
RADIATION DETECTORS
SPECTRA