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The NA44 Collaboration has measured yields and differential distributions of K+, K-, pi+, pi- in transverse kinetic energy and rapidity, around the center-of-mass rapidity in 158 A GeV/c Pb+Pb collisions at the CERN SPS. A considerable enhancement of K+ production per pi is observed, as compared to p+p collisions at this energy. To illustrate the importance of secondary hadron rescattering as an enhancement mechanism, we compare strangeness production at the SPS and AGS with predictions of the transport model RQMD.

4 data tables

Table 1

Inverse slope paramters of the (1/MT)*DN/DMT distribution.

Table 2

Rapidity distributions for K+ and K- production.. Statistical and systematic errors added in quadrature.

Table 3

Rapidity distributions for PI+ and PI- production.. Statistical and systematic errors added in quadrature.

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Collective expansion in high energy heavy ion collisions.

The NA44 collaboration Bearden, I.G. ; Boggild, H. ; Boissevain, J. ; et al.

Phys.Rev.Lett. 78 (1997) 2080-2083, 1997.

Inspire Record 426801 DOI 10.17182/hepdata.52345

Transverse mass spectra of pions, kaons, and protons from the symmetric heavy-ion collisions 200 A GeV S+S and 158 A GeV Pb+Pb, measured in the NA44 focusing spectrometer at CERN, are presented. The mass dependence of the slope parameters provides evidence of collective transverse flow from expansion of the system in heavy-ion induced central collisions.

3 data tables

Table 1

(1/MT)*d(N)/d(MT) = A *exp(-MT/SLOPE).

Table 2

(1/MT)*d(N)/d(MT) = A *exp(-MT/SLOPE).

Table 3

The SLOPE from the parameterization of (1/MT)*d(N)/d(MT) = A*exp(-MT/SLOPE)is fitted as follows SLOPE = CONST(C=1) + M(hadron)*CONST(C=2)**2.

Hadron distributions: Recent results from the CERN experiment NA44

The NA44 collaboration Xu, Nu ; Bearden, I.G. ; Bøggild, H. ; et al.

Nucl.Phys.A 610 (1996) 175C-187C, 1996.

Inspire Record 432743 DOI 10.17182/hepdata.36469

Proton distributions at midrapidity have been measured for 158A·GeV Pb+Pb collisions in the focusing spectrometer experiment NA44 at CERN. A high degree of nuclear stopping is found in the truly heavy ion collisions. Systematic results of single particle transverse momentum distributions of pions, kaons, and protons, of 200A·GeV S+S and 158A·GeV Pb+Pb central collisions will be addressed within the context of thermalization. By comparing these data with thermal and transport models, freeze-out parameters such as the temperature parameter T fo and mean collective flow velocity 〈β〉 are extracted. Preliminary results of the particle ratios of K − K + and p p are discussed in the context of cascade models of RQMD and VENUS.

1 data table

Table 1

CENTRAL COLLISIONS: SIG(TRIG)/SIG(GEOM)=10%.

Recent results from NA44 and a review of HBT

The NA44 collaboration Jacak, B.V. ; Boggild, H. ; Boissevain, J. ; et al.

Nucl.Phys.A 590 (1995) 215C-232C, 1995.

Inspire Record 407654 DOI 10.17182/hepdata.36517

None

1 data table

Table 1

PRELIMINARY DATA FOR CENTRAL EVENTS.

Deuteron and anti-deuteron production in CERN experiment NA44

The NA44 collaboration Simon-Gillo, Jehanne ; Boggild, H. ; Boissevain, J. ; et al.

Nucl.Phys.A 590 (1995) 483C-486C, 1995.

Inspire Record 407669 DOI 10.17182/hepdata.36518

The abundances of light nuclei probe the later stages of the evolution of a system formed in a relativistic heavy-ion collision. After the system has cooled and expanded, nucleons in close proximity and moving with small relative momenta coalesce to form nuclei. Light nuclei production enables the study of several topics, including the mechanism of composite particle production, freeze-out temperature, size of the interaction region, and entropy of the system. NA44 is the only relativistic heavy-ion experiment to have both deuteron and antideuteron results in both pA and AA collisions and the first CERN experiment to study the physics topics addressed by d and d production.

1 data table

Table 1

PRELIMINARY DATA.

Charged hadron distributions in p A and A-A collisions at the CERN SPS

The NA44 collaboration Dodd, Jeremy ; Bøggild, H. ; Boissevain, J. ; et al.

Nucl.Phys.A 590 (1995) 523C-526C, 1995.

Inspire Record 407678 DOI 10.17182/hepdata.36504

Single particle distributions of π ± , K ± , p , p and d near mid-rapidity from 450 GeV/c p A and 200 GeV/c per nucleon SA collisions are presented. Inverse slope parameters are extracted from the transverse mass spectra, and examined for indications of collective phenomena. Proton and antiproton yields are determined for different projectile-target combinations. First results from 160 GeV/c per nucleon PbPb collisions are presented.

2 data tables

Table 1

No description provided.

Table 2

PRELIMINARY DATA FOR CENTRAL EVENTS.

Measurement of the Cross-section of the Reaction $P P \to P P \pi^0$ in the Region of Dibaryon Resonances

Andreev, Valery P. ; Kravtsov, A.V. ; Makarov, M.M. ; et al.

Z.Phys.A 329 (1988) 371-373, 1988.

Inspire Record 266150 DOI 10.17182/hepdata.16595

None

1 data table

Table 1

No description provided.

MEASUREMENT OF CROSS-SECTIONS OF MESON PAIR PRODUCTION IN NUCLEON NUCLEON COLLISIONS BELOW 1-GEV AND ISOSPIN ANALYSIS. (IN RUSSIAN)

Dakhno, L.g. ; Kravtsov, A.v. ; Lobachev, E.a. ; et al.

Yad.Fiz. 37 (1983) 907-914, 1983.

Inspire Record 194256 DOI 10.17182/hepdata.17742

None

1 data table

Table 1

No description provided.

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Elastic pp scattering in the region of the coulomb interference at momenta 1.1 - 1.7 GeV/c

Measurement of the $\Delta^{-}-\Delta^{++}$ isobar electromagnetic mass difference

Strange meson enhancement in Pb Pb collisions.

Collective expansion in high energy heavy ion collisions.

Hadron distributions: Recent results from the CERN experiment NA44

Recent results from NA44 and a review of HBT

Deuteron and anti-deuteron production in CERN experiment NA44

Charged hadron distributions in p A and A-A collisions at the CERN SPS

Measurement of the Cross-section of the Reaction $P P \to P P \pi^0$ in the Region of Dibaryon Resonances

MEASUREMENT OF CROSS-SECTIONS OF MESON PAIR PRODUCTION IN NUCLEON NUCLEON COLLISIONS BELOW 1-GEV AND ISOSPIN ANALYSIS. (IN RUSSIAN)