APS » PROLA » Phys. Rev. D » Volume 55 » Issue 7

Phys. Rev. D 55, 3927 - 3932 (1997)

Differential cross sections of J/ψ and ψ′ in 800 GeV/c p-Si interactions

Download: PDF (127 kB) or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

T. Alexopoulos et al.
Show All Authors/Affiliations

Received 30 July 1996

We present the xF and pT differential cross sections of J/ψ and ψ′, respectively, in the ranges -0.05<xF<0.25 and pT<3.5 GeV/c. The data samples are constituted by about 12 000 J/ψ and 200 ψ′ produced in proton-silicon interactions at 800 GeV/c and decaying into opposite sign muons. The xF and pT distributions are compared with recent results from experiments E789 at the same energy and to leading order QCD predictions using the MRS D0 parametrization for the parton structure function. The measured shapes of the differential cross sections, except for the dσ/dxF at small xF, agree very well with the prediction, even though their value is quite a bit larger than the prediction. We also present the cosθ differential cross section of the J/ψ which indicates unpolarized production in contrast with color octet models predictions.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRD/v55/p3927
DOI: 10.1103/PhysRevD.55.3927
PACS: 13.85.Ni, 13.60.Le

[ Abstract  |  Previous article  |  Next article  |  Issue 7 ]