A study of photon production in hadronic events from e+e- annihilation
Creators
- Pitzl, D.D.1
- Greenshaw, T.1
- Hagemann, J.1
- Heinzelmann, G.1
- Kleinwort, C.1
- Kuhlen, M.1
- Ould-Saada, F.1
- Schneekloth, U.1
- Weber, G.1
- Allison, J.2
- Barlow, R.J.2
- Chrin, J.2
- Duerdoth, I.P.2
- Loebinger, F.K.2
- Macbeth, A.A.2
- Murphy, P.G.2
- Stephens, K.2
- Ambrus, K.3
- Bethke, S.3
- Dieckmann, A.3
- Eckerlin, G.3
- Elsen, E.3
- Heintze, J.3
- Hellenbrand, K.H.3
- Komamiya, S.3
- Krogh, J. von3
- Rieseberg, H.3
- Smolik, L.3
- Spitzer, J.3
- Wagner, A.3
- Zimmer, M.3
- Bartel, W.4
- Felst, R.4
- Haidt, D.4
- Kado, H.4
- Knies, G.4
- Krehbiel, H.4
- Magnussen, N.4
- Meinke, R.4
- Naroska, B.4
- Olsson, J.4
- Ramcke, R.4
- Schmidt, D.4
- Steffen, P.4
- Bowdery, C.K.5
- Finch, A.J.5
- Foster, F.5
- Hughes, G.5
- Nye, J.M.5
- Walker, I.W.5
- Cartwright, S.L.6
- Clarke, D.6
- Marshall, R.6
- Middleton, R.P.6
- Hill, P.7
- Skard, J.A.J.7
- Zorn, G.T.7
- Kawagoe, K.8
- Kobayashi, T.8
- Minowa, H.8
- JADE Collaboration
- 1. Hamburg Univ. (Germany, F.R.). 2. Inst. fuer Experimentalphysik
- 2. Manchester Univ. (UK)
- 3. Heidelberg Univ. (Germany, F.R.). Physikalisches Inst.
- 4. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)
- 5. Lancaster Univ. (UK)
- 6. Rutherford Appleton Lab., Chilton (UK)
- 7. Maryland Univ., College Park (USA)
- 8. Tokyo Univ. (Japan). Lab. of International Collaboration on Elementary Particle Physics
Description
Results are presented on an investigation of photons produced in multihadronic final states from e+e- annihilation at 35 GeV and 44 GeV center of mass energies. Scaling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π0 spectra with charged pion spectra it is found that the average π0 multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be =0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, of A=-0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time. (orig.)
Additional details
Publishing Information
- Journal Title
- Zeitschrift fuer Physik, C
- Journal Volume
- 46
- Journal Issue
- 1
- Series
- Z. Phys., C.
- Journal Page Range
- 1-7
- ISSN
- 0170-9739
- CODEN
- ZPCFD
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 21030062
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANGULAR CORRELATION; ANGULAR DISTRIBUTION; ANNIHILATION; ASYMMETRY; BREMSSTRAHLUNG; CHARGED PARTICLES; DIFFERENTIAL CROSS SECTIONS; EFFECTIVE MASS; ELECTROMAGNETIC PARTICLE DECAY; ELECTRON-POSITRON INTERACTIONS; ETA MESONS; EXPERIMENTAL DATA; GAMMA SPECTRA; GEV RANGE 10-100; INCLUSIVE INTERACTIONS; INTERFERENCE; ISOSPIN; JET MODEL; MASS SPECTRA; MULTIPLE PRODUCTION; MULTIPLICITY; PAIR PRODUCTION; PHOTONS; PIONS MINUS; PIONS NEUTRAL; PIONS PLUS; QUARKS; SCALE INVARIANCE; SYMMETRY BREAKING; WEAK HADRONIC DECAY
- Descriptors DEC
- BOSONS; CORRELATIONS; CROSS SECTIONS; DATA; DECAY; DISTRIBUTION; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; INVARIANCE PRINCIPLES; LEPTON-LEPTON INTERACTIONS; MASS; MASSLESS PARTICLES; MATHEMATICAL MODELS; MESONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PIONS; POSTULATED PARTICLES; PSEUDOSCALAR MESONS; RADIATIONS; SPECTRA; WEAK PARTICLE DECAY
Optional Information
- Collaborations
- JADE Collaboration.