Phys. Rev. D 62, 032006 (2000) [4 pages]Hadroproduction of the χ1 and χ2 states of charmonium in 800-GeV/c proton-silicon interactionsReceived 20 July 1999; published 11 July 2000 The cross sections for the hadroproduction of the χ1 and χ2 states of charmonium in proton-silicon collisions at √s=38.8 GeV have been measured in Fermilab fixed target experiment 771. The χ states were observed via their radiative decay to J/ψγ, where the photon converted to e+e- in the material of the spectrometer. The estimated values for the χ1 and χ2 cross sections for xF>0 are 263±69(stat)±32(syst) and 498±143(stat)±67(syst) nb per nucleon, respectively. The resulting σ(χ1)/σ(χ2) ratio of 0.53±0.20(stat)±0.07(syst), although somewhat larger than most theoretical expectations, can be accommodated by the latest theoretical estimates. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.62.032006
DOI:
10.1103/PhysRevD.62.032006
PACS:
13.85.Ni, 13.85.Qk, 14.40.Gx, 25.40.Ve
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