A study of photon production in hadronice + e ? annihilation

Autor: Alexander Finch, C. K. Bowdery, R. G. Glasser, H. Takeda, E. Elsen, F. K. Loebinger, S. Komamiya, D. Schmidt, B. Sechi-Zorn, J. Spitzer, H. Rieseberg, F. Foster, H. Krehbiel, H. Matsumura, L. Becker, R. Meinke, T. Greenshaw, Stephen Robert Wagner, M. Kuhlen, A. H. Ball, R. Felst, P. Laurikainen, P. Lennert, J. von Krogh, R. Ramcke, R. Marshall, G. Heinzelmann, Tetsuro Mashimo, Tohru Takeshita, J. T.M. Chrin, A. A. Macbeth, G. Knies, H. E. Mills, K. Stephens, K. Ambrus, T. Kawamoto, B. Naroska, J. B. Whittaker, T. Nozaki, T. Kobayashi, G. T. Zorn, P. Hill, Shoichi Yamada, P. G. Murphy, A. Petersen, D. Clarke, G. Weber, J. E. Olsson, John Allison, Claus Kleinwort, D. Haidt, J. Heintze, D. Cords, K. Kawagoe, S. Bethke, S. L. Cartwright, Makoto Minowa, Gareth Hughes, U. Schneekloth, K. H. Hellenbrand, Robin Middleton, H. Junge, Roger Barlow, P. Warming, K. Meier, H. Kado, W. Bartel, A. Dieckmann, J. Hagemann, A. Wagner, I. P. Duerdoth, J. A.J. Skard, J. M. Nye, P. Steffen, G. Dietrich
Rok vydání: 1985
Předmět:
Zdroj: Zeitschrift f�r Physik C Particles and Fields. 28:343-356
ISSN: 1434-6052
0170-9739
Popis: The production of photons ine+e−→γ+hadrons is investigated at three centre of mass energies around 14, 22 and 34 GeV. On average, photons carry 25% of the total available energy, with a multiplicity similar to the charged multiplicity. The inclusive photon spectra are found to scale with the centre of mass energy as a function of the Feynman variablex. π0 and η mesons are reconstructed from their decay photons. The slopes of the spectra are similar to that for charged pions and approximate scaling is observed for π0 production. The mean π0 and η multiplicities are given. The observed photon yield can be fully accounted for by hadron decays and initial state radiation. However, up to one extra photon per event from other sources cannot be excluded.
Databáze: OpenAIRE
Externí odkaz: