π0 production by e +e − annihilation at 14 and 34 GeV c.m. energy

• Published in: Physics letters. B Vol. 108; no. 1; pp. 71 - 76
• Main Authors: Brandelik, R., Braunschweig, W., Gather, K., Kirschfink, F.J., Lübelsmeyer, K., Martyn, H.-U., Peise, G., Rimkus, J., Sander, H.G., Schmitz, D., von Dratzig, A.Schultz, Trines, D., Wallraff, W., Boerner, H., Fischer, H.M., Hartmann, H., Hilger, E., Hillen, W., Knop, G., Köpke, L., Kolanoski, H., Leu, P., Wedemeyer, R., Wermes, N., Wollstadt, M., Burkhardt, H., Cooper, S., Heyland, D., Hultschig, H., Joos, P., Koch, W., Kötz, U., Kowalski, H., Ladage, A., Lüke, D., Lynch, H.L., Mättig, P., Mess, K.H., Notz, D., Pyrlik, J., Quarrie, D.R., Riethmüller, R., Shapira, A., Söding, P., Wiik, B.H., Wolf, G., Fohrmann, R., Holder, M., Krasemann, H.L., Poelz, G., Römer, O., Schmüser, P., Al-Agil, I., Beuselinck, R., Binnie, D.M., Campbell, A.J., Dornan, P.J., Garbutt, D.A., Jones, T.D., Jones, W.G., Lloyd, S.L., Pandoulas, D., Sedgbeer, J.K., Stern, R.A., Yarker, S., Bowler, M.G., Brock, I.C., Cashmore, R.J., Devenish, R., Grossmann, P., Illingworth, J., Ogg, M., Salmon, G.L., Thomas, J., Wyatt, T.R., Youngman, C., Bell, K.W., Foster, B., Hart, J.C., Proudfoot, J., Saxon, D.H., Woodworth, P.L., Duchovni, E., Eisenberg, Y., Karshon, U., Mikenberg, G., Revel, D., Ronat, E., Barklow, T., Freeman, J., Meyer, T., Rudolph, G., Wicklund, E., Wu, S.L., Zobernig, G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1982
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(82)91145-5

The process e +e −→ π 0 + anything has been measured at c.m. energies of 14 and 34 GeV for π 0 energies between 0.5 and 4 GeV. The ratio of π 0 to π ± production for π momenta between 0.5 and 1.5 GeV/ c is measured to be 2 σ( π 0)/ [ σ( π +) + σ( π −)] = 1.3 ± 0.4 (1.2 ± 0.4) at 14 (34) GeV. The scaled cross section ( s/ μ)d σ/d x when compared with lower energy (4.9–7.4 GeV) π 0 data indicates a substantial scaling violation.