Phys. Rev. Lett. 84, 3256–3260 (2000)Measurement of Differences between J/ψ and ψ′ Suppression in p-A CollisionsReceived 9 September 1999; revised 17 December 1999; published in the issue dated 10 April 2000 Measurements of the suppression of the yield per nucleon of J/ψ and ψ′ production for 800 GeV/ c protons incident on heavy nuclear targets, relative to light nuclear targets, have been made with very broad coverage in xF and pT. The observed suppression is smallest at xF values of 0.25 and below, and increases at larger values of xF. It is also strongest at small pT. Substantial differences between ψ′ and J/ψ production are observed for the first time in p-A collisions. The suppression for ψ′ production is stronger than that for J/ψ for xF near zero, but becomes comparable to that for J/ψ for xF>0.6. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.3256
DOI:
10.1103/PhysRevLett.84.3256
PACS:
24.85.+p, 13.85.Qk, 14.40.Lb, 14.65.Dw
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