Evidence for direct photons from quarks in electron-positron annihilation

Autor: Braunschweig, W., Gerhards, R., Kirschfink, F. J., Martyn, H. -U., Bock, B., Fischer, H. M., Hartmann, H., Hartmann, J., Hilger, E., Jocksch, A., Wedemeyer, R., Foster, B., Martin, A. J., Sephton, A. J., Barreiro, F., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Tymieniecka, T., Walczak, R., Wolf, G., Kolanoski, H., Gerhardt, W., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Rehders, P., Tysarczyk, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Heath, G. P., Ratoff, P., Silvester, I., Tomalin, I. R., Veitch, M. E., Forden, G. E., Hart, J. C., Saxon, D. H., Brandt, S., Holder, M., Labarga, L., Eisenberg, Y., Karshon, U., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Shapira, A., Wainer, N., Yekutieli, G., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, Zobernig, G.
Zdroj: Zeitschrift für Physik C Particles and Fields; September 1988, Vol. 41 Issue: 3 p385-393, 9p
Abstrakt: Hadronic events frome+e--annihilations with a high energy isolated photon have been investigated at C.M. energies between 14 GeV and 44 GeV. A forward-backward asymmetryA? of the positively charged jet with respect to the incident positron direction has been found:A??=-0.32±0.07, providing evidence for photon bremsstrahlung from quarks. The forward-backward asymmetry of all hadronic events at C.M. energies between 30 GeV and 36 GeV has been measured. The value, corrected for the limited polar angle acceptance of the detector, is:A=+0.021±0.005.
Databáze: Supplemental Index
Externí odkaz: