Direct photon production in e/sup +/e/sup -/ annihilation

Journal Article · Mon Jan 14 00:00:00 EST 1985 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.54.95· OSTI ID:6148523

Fernandez, E; Ford, W T; Qi, N; Read, Jr, A L; Smith, J G; Camporesi, T; De Sangro, R; Marini, A; Peruzzi, I; Piccolo, M; Ronga, F; Blume, H T; Hurst, R B; Sleeman, J C; Venuti, J P; Wald, H B; Weinstein, R; Band, H R; Gettner, M W; Goderre, G P ; Meyer, O A; Moromisato, J H; Shambroom, W D; von Goeler, E; Ash, W W; Chadwick, G B; Clearwater, S H; Coombes, R W; Kaye, H S; Lau, K H; Leedy, R E; Lynch, H L; Messner, R L; Moss, L J; Muller, F; Nelson, H N; Ritson, D M; Rosenberg, L J; Wiser, D E; Zdarko, R W; Groom, D E; Lee, H Y; Delfino, M C; Heltsley, B K; Johnson, J R; Lavine, T L; Maruyama, T; Prepost, R

Direct photon production in hadronic events from e/sup +/e/sup -/ annihilation has been studied at ..sqrt..s = 29 GeV with use of the MAC detector at the PEP storage ring. A charge asymmetry A = (-12.3 +- 3.5)% is observed in the final-state jets. The cross section and the charge asymmetry are in good agreement with the predictions of the fractionally charged quark-parton model. Both the charge asymmetry and total yield have been used to determine values of quark charges. Limits have been established for anomalous sources of direct photons.

• Research Organization: Department of Physics, University of Colorado, Boulder, Colorado 80309
• DOE Contract Number: AC02-81ER40025; AC03-76SF00515; AC02-76ER00881
• OSTI ID: 6148523
• Journal Information: Phys. Rev. Lett.; (United States), Vol. 54:2
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
PHOTONS
PARTICLE PRODUCTION
ASYMMETRY
CROSS SECTIONS
ENERGY SPECTRA
JET MODEL
MONTE CARLO METHOD
PARTON MODEL
PEP STORAGE RINGS
QUARK MODEL
BASIC INTERACTIONS
COMPOSITE MODELS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTICLE INTERACTIONS
PARTICLE MODELS
SPECTRA
STORAGE RINGS
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties