Enhancement of central Λ, Ξ and yields in Pb-Pb collisions at 158 A GeV/c

Andersen, E.; Antinori, F.; Armenise, N.; Bakke, Hans Kristian; Bán, J.; Barberis, D.; Beker, H.; Beusch, W.; Bloodworth, I. J.; Böhm, J.; Caliandro, Rocco; Campbell, M.; Cantatore, Eugenio; Carrer, N.; Catanesi, M. G.; Chesi, E.; Dameri, M.; Darbo, G.; Diaczek, A.; Bari, D. Di; Liberto, S. Di; Earl, B.C.; Elia, D.; Evans, D.; Fanebust, K.; Fini, R. A.; Fontaine, J.-C.; Ftáčnik, J.; Ghidini, B.; Grella, G.; Guida, M.; Heijne, E.H.M.; Helstrup, Haavard; Holme, A.K.; Huss, D.; Jachołkowski, A.; Jones, G.; Jovanović, P.; Jusko, A.; Kachanov, V.A.; Kachelhoffer, T.; Kinson, J.B.; Kirk, A.; Klempt, W.; Knudsen, B.T.H.; Knudson, K.; Králik, I.; Lassalle, J. C.; Lenti, V.; Lietava, R.; Loconsole, R.A.; Løvhøiden, G.; Luptak, M.; Mack, V.; Manzari, V.; Martinengo, P.; Mazzoni, M. A.; Meddi, F.; Michalon, A.; Michalon-Mentzer, M.E.; Middelkamp, P.; Morando, M.; Muciaccia, M. T.; Nappi, E.; Navach, F.; Norman, Paul; Osculati, B.; Pastirčák, B.; Pellegrini, F.; Piska, K.; Posa, F.; Quercigh, E.; Ricci, R. A.; Romano, G.; Rosa, G. De; Rossi, L. P.; Rotscheidt, H.; Šafařı́k, K.; Saladino, S.; Salvo, C.; Šándor, L.; Scognetti, T.; Segato, G.; Sené, M.; Sené, R.; Simone, S.; Singovski, A.; Snoeys, W.; Staroba, P.; Szafran, S.; Thompson, M.; Thorsteinsen, T.F.; Tomasicchio, G.; Torrieri, Giorgio; Tveter, Trine Spedstad; Urbán, J.; Vassiliadis, G.; Venables, M.; Baillie, O. Villalobos; Virgili, T.; Volte, A.; Votruba, M.F.; Závada, P.

doi:10.1016/s0370-2693(98)00689-3

Cited by 118 publications

(35 citation statements)

References 24 publications

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“…As the partons are deconfined, we expect this enhancement of strangeness production to be more pronounced for multi-strange particles, which can now be built using uncorrelated strange quarks which were produced in independent microscopic interactions: we therefore expect the enhancement to increase with the particles' strangeness content [8]. Indeed, such a pattern of strangeness enhancement has been observed by the WA97 and NA57 Collaborations in Pb-Pb collisions at the SPS at a beam momentum of 158 A GeV/c (√s NN = 17.3 GeV) [9,10,11]. The enhancement is defined as the yield per wounded nucleon relative to the yield per wounded nucleon in a light reference system (for instance pp or pBe): for a generic collision system AB the enhancement of a generic particle j is computed as:…”

Section: Strangeness Enhancement Patternmentioning

confidence: 85%

Strangeness report

Antinori

2004

J. Phys. G: Nucl. Part. Phys.

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Section: Strangeness Enhancement Patternmentioning

confidence: 85%

Strangeness report

Antinori

2004

J. Phys. G: Nucl. Part. Phys.

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“…The kinematical region is about one unit of rapidity centred at midrapidity and the p T starts from a few hundred MeV c −1 , depending on the particle type. The acceptance windows for the hyperons , and have been published for the Pb-Pb and the p-Pb set-up in [2]. The p-Be window is very similar to the p-Pb one.…”

Section: Discussionmentioning

confidence: 97%

“…The WA97 apparatus is described in detail elsewhere [2]. The main tracking device, consisting of a silicon telescope made of pixel and microstrip planes (5 × 5 cm 2 of sensitive area), is sketched in figure 1.…”

Section: Discussionmentioning

confidence: 99%

Strange baryon production in Pb-Pb collisions at 158AGeV/c

Fini

Beusch

Bloodworth

et al. 2001

J. Phys. G: Nucl. Part. Phys.

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The experiment WA97 is dedicated to the study of strange baryon production in Pb-Pb interactions at SPS energy. Results on the production of strange and multistrange baryons at midrapidity in Pb-Pb at 158 A GeV c-1 are reported and compared with those from p-Pb and p-Be reactions at the same energy. The evidence for deconfinement emerging from the observed pattern of strange baryon production is discussed.

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“…The contributions of S 1 2 S 2 and S 2 2 S 1 were accounted for by assuming the same rapidity distributions as L 2 L and scaling the L 2 L distribution by an empirical factor 1.6 6 0.1 derived from hadronic reactions [21]. Multistrange baryons contribute less than 2% to B 2 B [22] and were not accounted for. The net baryon yield B 2 B was then calculated as B 2 B ͑2.07 6 0.05͒ ͑p 2 p͒ Figure 1, lower panel, shows the B 2 B rapidity distribution for Pb 1 Pb.…”

mentioning

confidence: 99%

Baryon Stopping and Charged Particle Distributions in CentralPb+PbCollisions at 158 GeV per Nucleon

Appelshäuser¹,

Bächler²,

Bailey³

et al. 1999

Phys. Rev. Lett.

257

112

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Net proton and negative hadron spectra for central Pb 1 Pb collisions at 158 GeV per nucleon at the CERN Super Proton Synchrotron were measured and compared to spectra from lighter systems. Net baryon distributions were derived from those of net protons. Stopping (rapidity shift with respect to the beam) and mean transverse momentum ͗ p T ͘ of net baryons increase with system size. The rapidity density of negative hadrons scales with the number of participant nucleons for nuclear collisions, whereas their ͗ p T ͘ is independent of system size. The ͗ p T ͘ dependence upon particle mass and system size is consistent with larger transverse flow velocity at midrapidity for Pb 1 Pb compared to S 1 S central collisions. Lattice QCD predicts that strongly interacting matter at an energy density greater than 1 2 GeV͞fm 3 attains a deconfined and approximately chirally restored state known as the quark-gluon plasma (for an overview, see [1]). This state of matter existed in the early Universe, and it may influence the dynamics of rotating neutron stars [2]. The collision of nuclei at ultrarelativistic energies offers the possibility in the laboratory of creating strongly interacting matter at sufficiently high energy density to form a quark-gluon plasma [3]. Hadronic spectra from these reactions reflect the dynamics of the hot and dense zone formed in the collision. The baryon density, established 0031-9007͞99͞82(12)͞2471(5)$15.00

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Enhancement of central Λ, Ξ and yields in Pb-Pb collisions at 158 A GeV/c

Abstract: Pb interactions are presented as a function of the collision centrality and compared with those obtained from p-Pb collisions. Strangeness enhancement is observed which increases with centrality and with the strangeness content of the hyperon.

Cited by 118 publications

References 24 publications

Strangeness report

Strangeness report

Strange baryon production in Pb-Pb collisions at 158AGeV/c

Baryon Stopping and Charged Particle Distributions in CentralPb+PbCollisions at 158 GeV per Nucleon

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