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High Statistics Study of ($\sim$ 10$^6$ events) of $J/\psi$ Production and $\Upsilon$ Production in the energy range 150 to 280 GeV by $\pi^\pm$, $p^\pm$ incident particle

The Saclay-CERN-College de France-Ecole Poly-Orsay collaboration Badier, J. ; Boucrot, J. ; Bourotte, J. ; et al.

AIP Conf.Proc. 68 (1981) 201-204, 1981.

Inspire Record 154782 DOI 10.17182/hepdata.49656

We have performed in the NA3 experiment the study of high mass dimuon production by a hadronic unseparated beam on hydrogen and platinum targets. The comparison of the production cross‐section for proton and antiproton together with the differential cross‐section dσ/dx allows us to compare the data with a production mechanism involving quark‐antiquark and gluon‐gluon interactions. The cosΘ* distribution of the same J/ψ data have also been analysed and results will be presented. Finally we have observed T production from 150 GeV/c incident pions.

4 data tables

Table 1

No description provided.

Table 2

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Table 3

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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.

J / psi, psi-prime and muon pair production in p - W and S - U collisions

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

Nucl.Phys.A 566 (1994) 77C-85C, 1994.

Inspire Record 358346 DOI 10.17182/hepdata.36538

In this paper we present a study on the production of the J ψ and ψ′ resonances, decaying into muon pairs, in S-U collisions, at 200 GeV per incident nucleon. We find that the ratio between ψ′ and tJ ψ yields decreases as E T , the neutral transverse energy produced in the collision, increases. There is also a clear decrease of this ratio when going from p-W to S-U interactions. Assuming the high mass continuum to be Drell-Yan we discuss the possible understanding of the intermediate dimuon mass region as a superposition of Drell-Yan (extrapolated down in mass) and muon pairs from the semileptonic decays of charmed mesons. The p-W data is found to be explained by this procedure. However, the S-U data seems to be incompatible with a linear extrapolation from the proton-nucleus results.

4 data tables

Table 1

THE NEUTRAL TRANSVERSE ENERGY PRODUCED IN THE COLLISION > 15 GEV.

Table 2

THE NEUTRAL TRANSVERSE ENERGY PRODUCED IN THE COLLISION > 15 GEV.

Table 3

THE NEUTRAL TRANSVERSE ENERGY PRODUCED IN THE COLLISION > 15 GEV.

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