Boldea, V.
P C --> J/PSI(1S) X
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Anomalous J / psi suppression in Pb - Pb interactions at 158 GeV/c per nucleon

The NA50 collaboration Abreu, M.C. ; Alessandro, B. ; Alexa, C. ; et al.
Phys.Lett.B 410 (1997) 337-343, 1997.
Inspire Record 459314 DOI 10.17182/hepdata.28260

The Drell-Yan and J ψ cross-sections measured in PbPb collisions are compared with the values extrapolated from the results obtained in proton and light ion induced reactions. While the Drell-Yan production exhibits the normal expected behaviour, the yield of J ψ in PbPb interactions is abnormally low, as it lies 9 standard deviations below the expected value. Moreover, the departure from the expected behaviour increases significantly from peripheral to central collisions.

2 data tables
Table 1

The results from other experiments are also presented.

Table 2

Different data are rescaled at 200 GeV.


Nuclear dependence of J / psi production by 800-GeV/c protons near x(F) = 0

Leitch, M.J. ; Boissevain, J. ; Brown, C.N. ; et al.
Phys.Rev.D 52 (1995) 4251-4253, 1995.
Inspire Record 394199 DOI 10.17182/hepdata.55727

The nuclear dependence for 800 GeV/c proton production of J/ψ’s has been measured near xF=0. $J/ psi—’s produced from beryllium, carbon, and tungsten targets were detected with the Fermilab E789 pair spectrometer. These data extend the results from E772 down to the range xF=-0.1 to 0.1 and indicate a gradually increasing suppression as xF falls below zero.

3 data tables