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The Evolution of cross-section ratio psi-prime / J / psi from p A to S U interactions: Direct photon emission in correlation with Phi and J / psi

The NA38 collaboration Abreu, M.C. ; Baglin, C. ; Baldit, A. ; et al.

Nucl.Phys.A 590 (1995) 117C-126C, 1995.

Inspire Record 407649 DOI 10.17182/hepdata.42431

J ψ and ψ′ production cross sections are studied for several proton induced reactions and in SU collisions, in the NA38 experiment, by measuring the resonances' decays in the muon pair channel. Whereas in p-A interactions the ψ ′/ J / ψ ratio remains constantin going from p-p and p-d collisions to p-W and p-U, with a mean value of 1.76% ± 0.04%, in the SU data it exhibits half of this value and decreases as centrality of the collision increases. Also studied are the differences between the γ π 0 ratio yields correlated with the J ψ mass range and other dimuon masses; no significant effect is seen.

3 data tables

Table 1

DATA IN THE COLLINS-SOPPER FRAME, OF -0.5<COS(THETA)<0.5.

Table 2

DATA IN THE COLLINS-SOPPER FRAME, OF -0.5<COS(THETA)<0.5.

Table 3

No description provided.

psi-Prime and J / psi production in p W, p U and S U interactions at 200-GeV/nucleon

The NA38 collaboration Baglin, C. ; Bussière, A. ; Guillaud, J.P. ; et al.

Phys.Lett.B 345 (1995) 617-621, 1995.

Inspire Record 387018 DOI 10.17182/hepdata.36562

Ψ′ and J/Ψ yields are compared in p-W, p-U and S-U interactions at 200 GeV/nucleon. Their ratio decreases from proton-t to sulphur-induced reactions. It also decreases in sulphur-induced reactions from peripheral to central collisions. This result could indicate that the Ψ′ and J/Ψ suppression mechanisms have different origins in p- and S-induced reactions.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.