Details

Autor(en) / Beteiligte

• Aubert, J.J.
• Bassompierre, G.
• Becks, K.H.
• Best, C.
• Böhm, E.
• De Bouard, X.
• Brasse, F.W.
• Broll, C.
• Brown, S.
• Carr, J.
• Clifft, R.W.
• Cobb, J.H.
• Coignet, G.
• Combley, F.
• Crespo, J.M.
• D'Agostini, G.
• Dalpiaz, P.F.
• Dalpiaz, P.
• Dau, W.D.
• Davies, J.K.
• Declais, Y.
• Dobinson, R.W.
• Dosselli, U.
• Drees, J.
• Edwards, A.
• Edwards, M.
• Favier, J.
• Ferrero, M.I.
• Flauger, W.
• Gabathuler, E.
• Gamet, R.
• Gayler, J.
• Gerhardt, V.
• Gössling, C.
• Gregory, P.
• Haas, J.
• Hamacher, K.
• Hayman, P.
• Henckes, M.
• Korbel, V.
• Landgraf, U.
• Leenen, M.
• Maire, M.
• Massonnet, L.
• Minssieux, H.
• Mohr, W.
• Montgomery, H.E.
• Moser, K.
• Mount, R.P.
• Norton, P.R.
• McNicholas, J.
• Osborne, A.M.
• Payre, P.
• Peroni, C.
• Pessard, H.
• Pietrzyk, U.
• Rith, K.
• Schneegans, M.
• Sloan, T.
• Stier, H.E.
• Stockhausen, W.
• Thenard, J.M.
• Thompson, J.C.
• Urban, L.
• Villers, M.
• Wahlen, H.
• Whalley, M.
• Williams, D.
• Williams, W.S.C.
• Williamson, J.
• Wimpenny, S.J.

Titel

Production of charmonium in 250 GeV μ+-iron interactions

Ist Teil von

• Nuclear physics. B, 1983-01, Vol.213 (1), p.1-30

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

1983

Link zum Volltext

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• The production of J/ ϑ and ϑ′ has been measured in 250 GeV muon iron interactions. The measured total cross sections are σ( μN → μJ/ ϑX)=0.74±0.14 nb and σ( μN → μϑ′X)=0.16 ± 0.07 nb. An upper limit on the cross section times branching ratio for ϒ production of BR · σ ( μN → μϒX) < 5.2 × 10 −38 cm 2 (at 90% confidence level) is obtained. About half the J/ ϑ cross section is found to have Z ⩾ 0.95 (where Z= E(J/ ϑ/ ν). The first-order photon-gluon fusion model agrees well with the measured Q 2 and ν dependence of the J/ ϑ data and is used to extract the gluon momentum distribution. However, higher order QCD effects are needed to explain the Z distribution of the J/ ϑ and the observed broadening of the P t 2 distribution with decreasing Z. The decay angular distributions of the J/ ϑ are found to be flat in the s-channel frame, but there is evidence for polarisation in the t-channel frame.