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Lambda-Hyperon and K°-Meson Production Cross Sections In CC-lnteractlons at 4.2 GeV/c Momentum per Nucleon

Arakelian, S.G. ;

JINR-P1-83-354, 1983.

Inspire Record 1395686 DOI 10.17182/hepdata.39088

Lambda-hyperon and K°-meson production effective cross sections in Interactions of relativistlc carbon nuclei, measured using a 2-meter propane bubble chamber, appear to be <^c « (24+6) mb; <7°°0- (30 ±10) mb. They are In fair agreement with the predictions of the flrestreak model making use of the hypothesis on chemical equilibrium and associative production of strange particles. It means that strange particle production In CC-lnteractlons at 4.2 GeV/c momentum per nucleon Is well described without Invoking hypothesis about the quark-gluon phase transition.

1 data table

Table 1

No description provided.

Energy dependence of pion and kaon production in central Pb + Pb collisions.

The NA49 collaboration Afanasiev, S.V. ; Anticic, T. ; Barna, D. ; et al.

Phys.Rev.C 66 (2002) 054902, 2002.

Inspire Record 586383 DOI 10.17182/hepdata.31729

Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80 and 158 AGeV are presented. These are compared with data at lower and higher energies as well as with results from p+p interactions. The mean pion multiplicity per wounded nucleon increases approximately linearly with s_NN^1/4 with a change of slope starting in the region 15-40 AGeV. The change from pion suppression with respect to p+p interactions, as observed at low collision energies, to pion enhancement at high energies occurs at about 40 AGeV. A non-monotonic energy dependence of the ratio of K^+ to pi^+ yields is observed, with a maximum close to 40 AGeV and an indication of a nearly constant value at higher energies.The measured dependences may be related to an increase of the entropy production and a decrease of the strangeness to entropy ratio in central Pb+Pb collisions in the low SPS energy range, which is consistent with the hypothesis that a transient state of deconfined matter is created above these energies. Other interpretations of the data are also discussed.

33 data tables

Table 1

The centrality of the collisions expressed as a percentage of the inelastic cross section (7.15nb), and the mean numbers of wounded nuclei.

Table 2

The inverse slope parameter of the fitted transverse mass spectra.

Table 3

The rapidity density averaged over the rapidity interval -0.6 to 0.6.

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Enhancement of strange and multi-strange baryons and anti-baryons in S W interactions at 200-GeV/c.

The WA85 collaboration Antinori, F. ; Barnes, R.P. ; Bayes, A.C. ; et al.

Phys.Lett.B 447 (1999) 178-182, 1999.

Inspire Record 500180 DOI 10.17182/hepdata.28123

Strange and multistrange baryon production is expected to be enhanced in heavy ion interactions if a phase transition from hadronic matter to a Quark-Gluon Plasma takes place. The production yields of Λ s, Λ s, Ξ − s, and Ξ + s relative to the production of negative particles are presented for sulphur-tungsten interactions at 200 GeV/ c per nucleon. These production yields are compared to those produced in proton-tungsten interactions and the enhancements of strange and multistrange baryons and antibaryons are presented.

3 data tables

Table 1

Hyperon to negative production ratios with sulphur beam.

Table 2

Hyperon to negative production ratios with proton beam.

Table 3

Strange and multistrange baryon enhancements.

Hyperon production in proton tungsten interactions at 200-GeV/c

The WA85 collaboration Abatzis, S. ; Andrighetto, A. ; Antinori, F. ; et al.

Phys.Lett.B 393 (1997) 210-216, 1997.

Inspire Record 456774 DOI 10.17182/hepdata.6511

The relative production yields and transverse mass spectra for Λ, Λ , Ξ − and Ξ + hyperons in proton-tungsten interactions are presented and compared with the WA85 results from central sulphur-tungsten interactions. A study of the negative particle yield has also been undertaken and the ratio of Λ hyperons to negative particles has been calculated.

9 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Lambda hyperons in 2-A-GeV Ni + Cu collisions.

The EOS collaboration Justice, M. ; Albergo, S. ; Bieser, F. ; et al.

Phys.Lett.B 440 (1998) 12-19, 1998.

Inspire Record 447685 DOI 10.17182/hepdata.31414

A sample of Lambda's produced in 2 A*GeV Ni + Cu collisions has been obtained with the EOS Time Projection Chamber at the Bevalac. Low background in the invariant mass distribution allows for the unambiguous demonstration of Lambda directed flow. The transverse mass spectrum at mid-rapidity has the characteristic shoulder-arm shape of particles undergoing radial transverse expansion. A linear dependence of Lambda multiplicity on impact parameter is observed, from which a total Lambda + Sigma^0 production cross section of $112 +/- 24 mb is deduced. Detailed comparisons with the ARC and RVUU models are made.

1 data table

Table 1

No description provided.

Study of K0(S), Lambda and Antilambda production in S W collisions at 200-GeV/c per nucleon.

The WA85 collaboration Abatzis, S. ; Andrighetto, A. ; Antinori, F. ; et al.

Phys.Lett.B 376 (1996) 251-254, 1996.

Inspire Record 418434 DOI 10.17182/hepdata.47561

Results on K s 0 production at central rapidity in sulphur-tungsten interactions are presented. The selection procedure used to identify K s 0 particles through their decay to two charged pions is described. The m T spectra for K s 0 , Λ and Λ and the relative production rates K s 0 Λ and K s 0 Λ , calculated in the kinematic region p T > 1 GeV/ c and 2.5 ≤ y LAB ≤ 3.0, are discussed.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Multiplicity dependence of strangeness production in S + Pb collisions at 200-GeV/c per nucleon

The NA36 collaboration Andersen, E ; Blaes, R ; Brom, J.M ; et al.

Phys.Lett.B 316 (1993) 603-607, 1993.

Inspire Record 364810 DOI 10.17182/hepdata.28817

Production of Λ, Λ , and K s 0 has been measured for a wide range of event multiplicity in S+Pb reactions at 200 GeV/c per nucleon. The production of Λ is shown to increase with multiplicity faster than expected from a superposition of p+p collisions. The effect is seen for low multiplicity (below 100 negative particles).

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Xi-, anti-xi-, Lambda and anti-Lambda production in sulphur - tungsten interactions at 200-GeV/c per nucleon

The WA85 collaboration Abatzis, S. ; Antinori, F. ; Barnes, R.P. ; et al.

Phys.Lett.B 270 (1991) 123-127, 1991.

Inspire Record 318147 DOI 10.17182/hepdata.29306

Multi-strange baryon and antibaryon production is expected to be a useful probe in the search for quark-gluon plasma formation. We present the transverse mass distributions of negative particles, Λ' s , Λ ' s and Ξ − ' s produced in sulphur-tungsten interactions at 200 GeV/ c per nucleon and give the corrected rations Λ /Λ, Ξ − /Λ and Ξ − / Λ . Our ratio Ξ − / Λ appears to be larger than that from pp interactions.

3 data tables

Table 1

Inverse slopes for different particle production.

Table 2

Data from this and other WA85 publications.

Table 3

Data from this and other WA85 publications.