Dimuon production in collisions of proton, oxygen and sulfur ions on heavy targets at 200 GeV/nucleon; $J/\psi$ production, $\pi$ and $K$ distributions

The NA38 collaboration Grossiord, J.Y. ; Abreu, M.C. ; Alimi, M. ; et al.
Nucl.Phys.A 498 (1989) 249-260, 1989.
Inspire Record 1392869 DOI 10.17182/hepdata.36947

The dimuon production in 200 GeV/nucleon O-U, O-Cu, S-U and p-U reactions is studied in function of transverse energy E T produced by the collision. The J / ψ production relative to continuum events is suppressed for heavy ion induced reactions when E T increases. This suppression is enhanced at low transverse momentum. The π and K meson distributions extracted from the data, have, for each reaction, a similar average transverse momentum which increases only slightly with the transverse energy.

3 data tables

No description provided.

No description provided.

No description provided.


Dimuon and charm production in nucleus nucleus collisions at the CERN-SPS.

The NA38 & NA50 collaborations Abreu, M.C. ; Alessandro, B. ; Alexa, C. ; et al.
Eur.Phys.J.C 14 (2000) 443-455, 2000.
Inspire Record 524686 DOI 10.17182/hepdata.57421

Muon pair production in p-A, S-U and Pb-Pb collisions has been studied by the NA38 and NA50 collaborations at the CERN SPS. In this paper we present an analysis of the dimuon invariant mass region bet

1 data table

CHARM-CHARMBAR cross section Need to divide by 2 to consider only the XF>0 hemisphere.


Charmonia production in 450-GeV/c proton induced reactions.

The NA38 collaboration Abreu, M.C. ; Baglin, C. ; Baldit, A. ; et al.
Phys.Lett.B 444 (1998) 516-522, 1998.
Inspire Record 478387 DOI 10.17182/hepdata.49294

Absolute J/ ψ and ψ ′ production cross sections have been measured at the CERN SPS, with 450 GeV/ c protons incident on a set of C, Al, Cu and W targets. Complementing these values with the results obtained by experiment NA51, which used the same beam and detector with H and D targets, we establish a coherent picture of charmonia production in proton-induced reactions at SPS energies. In particular, we show that the scaling of the J/ ψ cross section with the mass number of the target, A, is well described as A α , with α ψ =0.919±0.015. The ratio between the J/ ψ and ψ ′ yields, in our kinematical window, is found to be independent of A, with α ψ ′ − α ψ =0.014±0.011.

5 data tables

The ratio of the production cross sections, in the di-muon channel. Note that there are wo set of CU and WT data with targets of different lengths. An average values is also given for these.

The J/PSI absolute cross sections, times the BR to di-muons.

The PSI(3685) absolute cross sections, times the BR to di-muons.

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J/psi, psi' and Drell-Yan production in S U interactions at 200-GeV per nucleon.

The NA38 collaboration Abreu, M.C. ; Astruc, J. ; Baglin, C. ; et al.
Phys.Lett.B 449 (1999) 128-136, 1999.
Inspire Record 482405 DOI 10.17182/hepdata.49239

A detailed study of J/ ψ , ψ ′ and Drell-Yan production in S-U collisions has been performed by experiment NA38 at the CERN SPS. This paper presents production cross sections and their centrality dependence, based on the largest sample of S-U events collected by the experiment.

2 data tables

Cross sections (times decay BR into di-muons) and ratios.

Centrality dependence of the rations of J/PSI/DY and PSI(3685)/J/PSI production.


Transverse momentum of J/psi, psi' and mass continuum muon pairs produced in S-32 U collisions at 200-GeV/c per nucleon.

The NA38 collaboration Abreu, M.C ; Astruc, J ; Baglin, C ; et al.
Phys.Lett.B 423 (1998) 207-212, 1998.
Inspire Record 467276 DOI 10.17182/hepdata.40524

We have studied the production of J/ ψ , ψ ′ and prompt muon pairs in the mass continuum from a sample of sulfur-uranium interactions at 200 GeV/c per nucleon. We report, in this letter, results obtained for the transverse momentum distributions and their dependence on the transverse energy released in the collision, used as an estimator of the centrality of the nucleus-nucleus interaction.

11 data tables

No description provided.

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Transverse momentum of J / psi produced in oxygen uranium collisions at 200-GeV per nucleon.

The NA38 collaboration Baglin, C. ; Baldisseri, A. ; Bussiere, A. ; et al.
Phys.Lett.B 251 (1990) 465-471, 1990.
Inspire Record 306053 DOI 10.17182/hepdata.29526

The study of the J ψ transverse momentum distribution in oxygen-uranium reactions at 200 GeV/nucleon shows that 〈 P T 〉 and 〈 P T 2 〉 increase with the transverse energy of the reaction. Muon pairs in the mass continuum do not exhibit the same behaviour. The comparison of the J ψ production rates in central and peripheral collisions shows a significant diminution for low P T central events.

4 data tables

Two parametrization of the D(SIG)/D(PT) are used: first is : PT*exp(-SLOPE*PT**CONST(C=PT)) and second is : PT*exp(-2*MT/CONST(C=MT)).

D(SIG)/D(PT) is parameterized as PT*exp(-SLOPE*PT**CONST).

D(SIG)/D(PT) is parameterized as PT*exp(-SLOPE*PT**CONST).

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Phi, rho, and omega production in p U, O U and S U reactions at 200-GeV per nucleon

The NA38 collaboration Baglin, C. ; Baldisseri, A. ; Bussiere, A. ; et al.
Phys.Lett.B 272 (1991) 449-454, 1991.
Inspire Record 325656 DOI 10.17182/hepdata.29289

Low mass muon pair production at high P T and low X F studied in pU, OU and SU 200 GeV per nucleon react ions. When energy density or projectile mass are increased, φ production is enhanced as compared with the yield of muon pairs in the mass continuum (1.7< M μμ < 2.4 GeV/ c 2 ), whereas the production of ω and ϱ, experimentally unresolved, remains approximately constant. This φ enhancement is in agreement with predictions based on quark-gluon plasma formation and, together with the previously reported J/Ψ suppression, puts severe constraints on a purely hadronic description of nucleus-nucleus collisions.

1 data table

The cross sections are parametrized as A**POWER.


Muon pair and vector meson cross-sections in p W and S U collisions at 200-GeV/nucleon

The NA38 collaboration Abreu, M.C. ; Baglin, C. ; Baldisseri, A. ; et al.
Phys.Lett.B 368 (1996) 230-238, 1996.
Inspire Record 428066 DOI 10.17182/hepdata.28422

Muon pair production is studied in p - W and S  U collisions at 200 GeV per nucleon, as a function of transverse momentum P Tμμ . The inclusive ϱ + ω and Φ differential cross-sections dσ dP T are measured in the dimuon decay channel, for P T ≥ 0.6 GeV/c, in the central rapidity region, 3.0≤ y ≤ 4.0. Assuming the power law A-dependence σ = σ 0 ( A beam · A target ) α , the study of the integrated cross-sections for p - W and S  U collisions leads to α ϱ + ω = 1.00±0.02±0.07 and α Φ = 1.23±0.03±0.05, showing clear evidence of Φ enhancement in S  U interactions as compared to p - W collisions.

4 data tables

Statistical errors only.

Statistical errors only.

Statistical errors only.

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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

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

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

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

No description provided.

No description provided.

No description provided.