Excess of continuum dimuon production at masses between threshold and the J/psi in S W interactions at 200-GeV/c/nucleon.

The HELIOS/3 collaboration Angelis, A.L.S. ; Antos, J. ; Beaulieu, M. ; et al.
Eur.Phys.J.C 13 (2000) 433-452, 2000.
Inspire Record 472127 DOI 10.17182/hepdata.49491

Results are presented on dimuon production for invariant masses ranging from the dimuon threshold up to the $J/\Psi$ meson. Proton-tungsten and sulphur-tungsten int

8 data tables

No description provided.

No description provided.

No description provided.

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Observation of a threshold effect in the anomalous J/psi suppression.

The NA50 collaboration Abreu, M.C ; Alessandro, B ; Alexa, C ; et al.
Phys.Lett.B 450 (1999) 456-466, 1999.
Inspire Record 499915 DOI 10.17182/hepdata.49189

We report on a search for a phase transition from ordinary nuclear matter to a state of deconfined quarks and gluons as predicted by lattice QCD calculations. A new measurement of charmonium production in Pb-Pb interactions at 158 GeV/ c per nucleon agrees with our previous results and confirms the anomalous J/ ψ suppression we had already observed on a significantly smaller data sample. New event selection and analysis techniques show that, for peripheral collisions, the J/ ψ cross-section per nucleon-nucleon collision agrees with the precise suppression pattern inferred from a wide range of measurements extending from p-p up to S-U collisions. As the collisions become more central, the Pb-Pb cross-section exhibits a clear departure from this normal behaviour. The onset of the anomalous J/ ψ suppression reported here is the first clear observation of a threshold effect in heavy ion collisions and can be considered as a strong indication of the production of a deconfined quark-gluon phase in central Pb-Pb collisions.

2 data tables

The J/PSI cross section is the cross section for decay to muon pairs.

The J/PSI cross section is the cross section for decay to muon pairs. The ratios in this taBLE Are obtained from the minimum bias sample of events. See text if article for details.


J / psi and Drell-Yan cross-sections 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) 327-336, 1997.
Inspire Record 459315 DOI 10.17182/hepdata.5631

First results are reported on J ψ and Drell-Yan cross-sections in PbPb reactions at 158 GeV/ c per nucleon. The ratio of cross-sections σ J/ψ /σ DY is studied as a function of the impact parameter of the collision estimated from the measured transverse energy.

5 data tables

No description provided.

No description provided.

The Drell-Yan cross sections are taken in the mass interval 2.9 to 4.5 GeV. SIG/SIG ratio are free from most systematic errors.

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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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Anomalous J / psi suppression in Pb + Pb collisions at 158-A-GeV/c

The NA50 collaboration Gonin, Michel ; Abreu, M.C. ; Alexa, C. ; et al.
Nucl.Phys.A 610 (1996) 404C-417C, 1996.
Inspire Record 432728 DOI 10.17182/hepdata.36494

Cross sections for J ψ,ψ′ and Drell-Yan production in Pb+Pb collisions at 158×A GeV/c are presented and compared with results obtained by the NA38 and NA51 collaborations. The Pb+Pb data have been collected by the NA50 collaboration using the NA38 dimuon spectrometer. The Drell-Yan mechanism is found to scale as (A projectile · B target ) in p+B target and A projectile + B target collisions including Pb+Pb collisions. Regarding J ψ , an anomalous suppression is observed in Pb+Pb collisions with respect to the suppression observed in p+B target , O+B target and S+U collisions. The cross section ratios ψ′ ( J ψ ) are similar in Pb+Pb and S+U collisions.

2 data tables

No description provided.

No description provided.


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.


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

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

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

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

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Transverse momentum of J / psi produced in p Cu, p U, O-16 Cu, O-16 U and S-32 U collisions at 200-GeV per nucleon.

The NA38 collaboration Baglin, C. ; Baldisseri, A. ; Bussiere, A. ; et al.
Phys.Lett.B 262 (1991) 362-368, 1991.
Inspire Record 321322 DOI 10.17182/hepdata.29390

None

8 data tables

No description provided.

CONTINUUM MUONS ORIGINATE MAINLY FROM VECTOR MESON DECAYS, SEMI-LEPTONIC DECAYS OF D DBAR PAIRS AND FROM DRELL-YAN MECHANISM.

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{$J/\psi$} and muon-pair cross-sections in proton-nucleus and nucleus-nucleus collisions at 200 GeV per nucleon

Baglin, C. ; Baldisseri, A. ; Bussiere, A. ; et al.
Phys.Lett.B 270 (1991) 105-110, 1991.
Inspire Record 328409 DOI 10.17182/hepdata.29301

Muon-pair production has been measured in pCu, pU, OCu, OU and SU collisions at 200 GeV per nucleon. The cross sections are compatible with the atomic number dependence ( A proj. A targ. ) α where α =0.91±0.04 for the J/ψ resonance and α =1.01±0.04 for muon pairs produced in the mass continuum between 1.7 and 2.7 GeV/ c 2 .

10 data tables

Cross sections fitted with SIG0*(A(P=1)*A(P=2))** ALPHA. ALPHA is coded here as POWER(N=A*A,YN=SIG).

Cross sections fitted with SIG0*(A(P=1)*A(P=2))** ALPHA. ALPHA is coded here as POWER(N=A*A,YN=SIG).

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