Charged particle multiplicities in nuclear collisions at 200-GeV/N

The NA35 collaboration Baechler, J. ; Bartke, J. ; Bialkowska, H. ; et al.
Z.Phys. C51 (1991) 157-162, 1991.
Inspire Record 320907 DOI 10.17182/hepdata.14983
0 data tables match query

Centrality dependence of kaon yields in Si + A and Au + Au collisions at the AGS

The E-802 & E-866 collaborations Ahle, L. ; Akiba, Y. ; Ashktorab, K. ; et al.
Phys.Rev. C60 (1999) 044904, 1999.
Inspire Record 496863 DOI 10.17182/hepdata.31369

Charged kaon production has been measured in Si+Al and Si+Au collisions at 14.6 A GeV/c, and Au+Au collisions at 11.1 A GeV/c by Experiments 859 and 866 (the E--802 Collaboration) at the BNL AGS. Invariant transverse mass spectra and rapidity distributions for both K+ and K- are presented. The centrality dependence of rapidity-integrated kaon yields is studied. Strangeness enhancement is observed as an increase in the slope of the kaon yield with the total number of participants as well as the yield per participant. The enhancement starts with peripheral Si+Al and Si+Au collisions (relative to N+N) and appears to saturate for a moderate number of participating nucleons in Si+Au collisions. It is also observed to increase slowly with centrality in Au+Au collisions, to a level in the most central Au+Au collisions that is greater than that found in central Si+A collisions. The enhancement factor for $K^+$ production are 3.0 +-0.2(stat.) +-0.4(syst.) and 4.0 +-0.3(stat.) +-0.5(syst.), respectively, for the most central 7% Si+Au collisions and the most central 4% Au+Au collisions relative to N+N at the correponding beam energy.

0 data tables match query

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

The NA38 collaboration Lourenco, Carlos ; Abreu, M.C. ; Baglin, C. ; et al.
Nucl.Phys. A566 (1994) 77C-85C, 1994.
Inspire Record 358346 DOI 10.17182/hepdata.36538
0 data tables match query

Multiplicity characteristics of particles produced in C-12 emulsion collisions at 4.5-A/GeV/c

Ahmad, M.S. ; Khan, M.Q.R. ; Siddique, K.A. ; et al.
Int.J.Mod.Phys. A10 (1995) 845-857, 1995.
Inspire Record 401127 DOI 10.17182/hepdata.40450
0 data tables match query

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

The NA50 collaboration Gonin, M. ; Abreu, M.C. ; Alexa, C. ; et al.
Nucl.Phys. A610 (1996) 404C-417C, 1996.
Inspire Record 432728 DOI 10.17182/hepdata.36494
0 data tables match query

Electron positron pair production in Coulomb collisions of ultrarelativistic sulphur ions with fixed targets

Vane, C.R. ; Datz, S. ; Dittner, P.F. ; et al.
Phys.Rev.Lett. 69 (1992) 1911-1914, 1992.
Inspire Record 343889 DOI 10.17182/hepdata.19818

Angular and momentum distributions have been measured for positrons from electron-positron pairs created in peripheral collisions of 6.4-TeV sulfur ions with fixed targets of Al, Pd, and Au. The data are compared with results of several theoretical treatments. Measured differential cross sections peak at low momentum (≤1 MeV/c), extend significantly to much higher momenta (>17 MeV/c), and concentrate sharply in the forward direction, along the ion-beam axis. Positron yields scale as the square of the target nuclear charge as predicted by theory.

0 data tables match query

Intermediate mass fragment emission in heavy ion collisions: Energy and system mass dependence

Sisan, D. ; Bauer, W. ; Bjarki, O. ; et al.
Phys.Rev. C63 (2001) 027602, 2001.
Inspire Record 552389 DOI 10.17182/hepdata.25393
0 data tables match query

Measurement of neutral and charged current cross-sections in positron proton collisions at large momentum transfer

The H1 collaboration Adloff, C. ; Andreev, V. ; Andrieu, B. ; et al.
Eur.Phys.J. C13 (2000) 609-639, 2000.
Inspire Record 506029 DOI 10.17182/hepdata.43872

The inclusive single and double differential cross-sections for neutral and charged current processes with four-momentum transfer squared Q^2 between 150 and 30,000 GeV2 and with Bjorken x between 0.0032 and 0.65 are measured in e^+ p collisions. The data were taken with the H1 detector at HERA between 1994 and 1997, and they correspond to an integrated luminosity of 35.6 pb^-1. The Q^2 evolution of the parton densities of the proton is tested, yielding no significant deviation from the prediction of perturbative QCD. The proton structure function F_2(x,Q^2) is determined. An extraction of the u and d quark distributions at high x is presented. At high Q^2 electroweak effects of the heavy bosons Z0 and W are observed and found to be consistent with Standard Model expectation.

0 data tables match query

Measurement of neutral and charged current cross-sections in electron - proton collisions at high $Q^{2}$

The H1 collaboration Adloff, C. ; Andreev, V. ; Andrieu, B. ; et al.
Eur.Phys.J. C19 (2001) 269-288, 2001.
Inspire Record 539088 DOI 10.17182/hepdata.46812

The inclusive e^-p single and double differential cross sections for neutral and charged current processes are measured with the H1 detector at HERA, in the range of four-momentum transfer squared Q^2 between 150 and 30000 GeV^2, and Bjorken x between 0.002 and 0.65. The data were taken in 1998 and 1999 with a centre-of-mass energy of 320 GeV and correspond to an integrated luminosity of 16.4 pb^(-1). The data are compared with recent measurements of the inclusive neutral and charged current e^+p cross sections. For Q^2>1000 GeV^2 clear evidence is observed for an asymmetry between e^+p and e^-p neutral current scattering and the generalised structure function xF_3 is extracted for the first time at HERA. A fit to the charged current data is used to extract a value for the W boson propagator mass. The data are found to be in good agreement with Standard Model predictions.

0 data tables match query

A Search for excited fermions in electron - proton collisions at HERA

The ZEUS collaboration Derrick, M. ; Krakauer, D. ; Magill, S. ; et al.
Z.Phys. C65 (1995) 627-648, 1995.
Inspire Record 378836 DOI 10.17182/hepdata.45049
0 data tables match query

Production of helium fragments in Au-197 emulsion collisions at 10.6-A/GeV

Singh, G. ; Jain, P.L. ;
Z.Phys. A348 (1994) 99-104, 1994.
Inspire Record 380467 DOI 10.17182/hepdata.16555
0 data tables match query

Kaon production in Au + Au collisions at 11.6-A-GeV/c

The E-802 collaboration Ahle, L. ; Akiba, Y. ; Ashktorab, K. ; et al.
Phys.Rev. C58 (1998) 3523-3538, 1998.
Inspire Record 483011 DOI 10.17182/hepdata.25644
0 data tables match query

On the Production of Helium Fragments in Ultrarelativistic Heavy Ion Collisions

Sengupta, K. ; Singh, G. ; Jain, P.L. ;
Phys.Lett. B222 (1989) 301-305, 1989.
Inspire Record 25611 DOI 10.17182/hepdata.29805

Partial production cross sections of projectile alpha fragments produced in high-energy interactions of 16 O and 32 S at 200 GeV/n and 16 O at 60 GeV/n in emulsion are studied. Evidence of multiplicity scaling of such produced fragments is presented in the energy range 2–200 GeV/n for various projectiles.

0 data tables match query

Multistep production of eta and hard pi0 mesons in subthreshold Au Au collisions

Wolf, A.R. ; Appenheimer, M. ; Averbeck, R. ; et al.
Phys.Rev.Lett. 80 (1998) 5281-5284, 1998.
Inspire Record 471975 DOI 10.17182/hepdata.41989
0 data tables match query

Simultaneous multiplicity and forward energy characterization of particle spectra in Au + Au collisions at 11.6-A-GeV/c

The E-802 collaboration Ahle, L. ; Akiba, Y. ; Ashktorab, K. ; et al.
Phys.Rev. C59 (1999) 2173-2188, 1999.
Inspire Record 501648 DOI 10.17182/hepdata.4988
0 data tables match query

Enhanced production of low mass electron pairs in 200-GeV/u S - Au collisions at the CERN SPS

The CERES collaboration Agakichiev, G. ; Baur, R. ; Breskin, A. ; et al.
Phys.Rev.Lett. 75 (1995) 1272-1275, 1995.
Inspire Record 393957 DOI 10.17182/hepdata.47988
0 data tables match query

Projectile stopping in nucleus nucleus and hadron nucleus collisions at 4.2-GeV/c and 10-GeV/c per nucleon

Wosinska, K. ; Miller, K. ; Pluta, J. ;
Z.Phys. C72 (1996) 613-617, 1996.
Inspire Record 432851 DOI 10.17182/hepdata.14315
0 data tables match query

Central Collisions of 14.6-{GeV}/nucleon, 60-{GeV}/nucleon, and 200-{GeV}/nucleon $^{16}$O Nuclei in Nuclear Emulsion

Barbier, L.M. ; Freier, P.S. ; Holynski, R. ; et al.
Phys.Rev.Lett. 60 (1988) 405-407, 1988.
Inspire Record 264260 DOI 10.17182/hepdata.2969

Central collisions of O16 nuclei with the Ag107 and Br80 nuclei in nuclear emulsion at 14.6, 60, and 200 GeV/nucleon are compared with proton-emulsion data at equivalent energies. The multiplicities of produced charged secondaries are consistent with the predictions of superposition models. At 200 GeV/nucleon the central particle pseudorapidity density is 58±2 for those events with multiplicities exceeding 200 particles.

0 data tables match query

Event-by-event fluctuations of average transverse momentum in central Pb + Pb collisions at 158-GeV per nucleon

The NA49 collaboration Appelshauser, H. ; Bachler, J. ; Bailey, S.J. ; et al.
Phys.Lett. B459 (1999) 679-686, 1999.
Inspire Record 498247 DOI 10.17182/hepdata.41648

We present first data on event-by-event fluctuations in the average transverse momentum of charged particles produced in Pb+Pb collisions at the CERN SPS. This measurement provides previously unavailable information allowing sensitive tests of microscopic and thermodynamic collision models and to search for fluctuations expected to occur in the vicinity of the predicted QCD phase transition. We find that the observed variance of the event-by-event average transverse momentum is consistent with independent particle production modified by the known two-particle correlations due to quantum statistics and final state interactions and folded with the resolution of the NA49 apparatus. For two specific models of non-statistical fluctuations in transverse momentum limits are derived in terms of fluctuation amplitude. We show that a significant part of the parameter space for a model of isospin fluctuations predicted as a consequence of chiral symmetry restoration in a non-equilibrium scenario is excluded by our measurement.

0 data tables match query

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. B270 (1991) 105-110, 1991.
Inspire Record 328409 DOI 10.17182/hepdata.29301
0 data tables match query

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. B262 (1991) 362-368, 1991.
Inspire Record 321322 DOI 10.17182/hepdata.29390
0 data tables match query


Anikina, M.Kh. ; Abdurakhimov, A.U. ; Avramenko, S.A. ; et al.
No Journal Information, 1989.
Inspire Record 282227 DOI 10.17182/hepdata.38295
0 data tables match query

Transverse momentum of J / psi, psi-prime 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. B423 (1998) 207-212, 1998.
Inspire Record 467276 DOI 10.17182/hepdata.40524
0 data tables match query

Charged particle multiplicity near mid-rapidity in central Au + Au collisions at $S^{(1/2)}$ = 56-A/GeV and 130-A/GeV

The PHOBOS collaboration Back, B.B. ; Baker, M.D. ; Barton, D.S. ; et al.
Phys.Rev.Lett. 85 (2000) 3100-3104, 2000.
Inspire Record 530501 DOI 10.17182/hepdata.41732

We present the first measurement of pseudorapidity densities of primary charged particles near mid-rapidity in Au+Au collisions at $\sqrt{s} =$ 56 and 130 AGeV. For the most central collisions, we find the charged particle pseudorapidity density to be $dN/d\eta |_{|\eta|<1} = 408 \pm 12 {(stat)} \pm 30 {(syst)}$ at 56 AGeV and $555 \pm 12 {(stat)} \pm 35 {(syst)}$ at 130 AGeV, values that are higher than any previously observed in nuclear collisions. Compared to proton-antiproton collisions, our data show an increase in the pseudorapidity density per participant by more than 40% at the higher energy.

0 data tables match query