245 research outputs found
WA97 results on strangeness production in lead-lead collisions at 158
No full texte , J.C. Lassalle e , V. Lenti b , Ph. Leruste l , J.A. Lien j , R. Lietava g , R.A. Loconsole b , L. Lopez e , G. Løvhøiden j , M. Luptak g , I. Macha n , V. Mack i , V. Manzari b , P. Martinengo e , M.A. Mazzoni o , F. Meddi o , A. Michalon r , M.E. Michalon-Mentzer r , P. Middelkamp e , M. Morando k , M.T. Muciaccia b , E. Nappi b , J.L. Narjoux l , F. Navach b , K. Norman d , B. Osculati f , B. Pastircak g , F. Pellegrini k , K. Pska m , F. Posa b , E. Querci
Production of hyperons and anti-hyperons in heavy-ion collisions at SPS: experiments at the CERN Omega spectrometer
No full textStrangeness enhancement at mid-rapidity in Pb-Pb collisions at 158 A GeV/c
No full textK-S(0), Lambda, Xi, Omega and negative particle yields and transverse mass spectra have been measured at central rapidity in Pb-Pb and p-Pb collisions at 158 A GeV/c. Yields are studied as a function of the number of nucleons participating in the collision N-part, which is estimated with the Glauber model. From p-Fb to Pb-Pb collisions the particle yields per participant increase substantially, The enhancement is more pronounced for multistrange particles, and exceeds an order of magnitude for the Omega. For a number of participants, N-part, greater than 100, however, all yields per participant appear to be constant. (C) 1999 Published by Elsevier Science B.V. All rights reserved
Enhancement of strange and multi-strange baryons in central Pb-Pb interactions at 158 GeV/c per nucleon
No full textStrange and multi-strange 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: and transverse mass spectra of strange and multi-strange baryons and anti-baryons are presented for lead-lead interactions at 158 GeV/c per nucleon. Yields and transverse mass spectra from proton-lead and proton-beryllium interactions, where no phase transition is expected, are also presented and compared to those from lead-lead interactions
Strangeness enhancement at midrapidity in Pb-Pb collisions at 158 A GeV/c: A comparison with VENUS and RQMD models
No full textRecently the WA97 Collaboration has measured K-S(0), Lambda, Xi, Omega and negative particle yields and transverse mass spectra at central rapidity in Pb-Pb and p-Pb collisions at 158 A GeV/c. These results are compared with the predictions of two of the most widely used event generators for heavy-ion collisions: VENUS 4.12 and RQMD 2.3. Both models predict that enhancement, increase with the strangeness content of the particle. They fail, however, to reproduce completely the measured values of yields at central rapidity. In particular, for multistrange particles, VENUS fails: to reproduce both the p-Pb and the Pb-Pb data. while RQMD works for p-Pb collisions but seems to be unable to reproduce the Omega data in Pb-Pb collisions. Moreover, the predicted behavior for strangeness production as: a function of the centrality of the collision appears to be different from the observed behavior
Enhancement of central Delta, Xi and Omega yields in Pb-Pb collisions at 158 A GeV/c
No full textLambda, Xi and Omega yields and transverse mass spectra have been measured in Pb-Pb and p-Pb collisions at 158 A GeV/c. The yields in Pb-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. (C) 1998 Published by Elsevier Science B.V. All rights reserved
Energy dependence of hyperon production in nucleus-nucleus collisions at SPS
No full textA measurement of strange baryon and antibaryon production in Pb-Pb collisions has been carried out by the NA57 experiment at the CERN SPS, with 40 and 158 A GeV/c beam momentum. Results on Lambda, Xi and Omega hyperon yields at mid-rapidity in the most central 53% of Pb-Pb collisions at 40 A GeV/c are presented and compared with those obtained at higher energy, in the same collision centrality range. The Lambda and Xi(-) yields per unit rapidity stay roughly constant while those of Omega(-), A, (&UXi;) over bar (+) and (&UOmega;) over bar (+) increase when going to the higher SPS energy. Hyperon yields at the SPS are compared with those from the STAR experiment in root(s)NN = 130 GeV Au-Au collisions at RHIC. (C) 2004 Elsevier B.V. All rights reserved
Enhancement of central , and yields in Pb-Pb collisions at 158 A GeV/c
No full text, and yields and transverse mass spectra have been measured at central rapidity in Pb-Pb and p-Pb collisions at 158~A~GeV/. The yields in Pb-Pb interactions are presente d 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 co ntent of the hyperon
Long-range angular correlations on the near and away side in p-Pb collisions at root S-NN=5.02 TeV
No full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV for transverse momentum ranges within 0.5 < P-T,P-assoc < P-T,P-trig < 4 GeV/c. The correlations are measured over two units of pseudorapidity and full azimuthal angle in different intervals of event multiplicity, and expressed as associated yield per trigger particle. Two long-range ridge-like structures, one on the near side and one on the away side, are observed when the per-trigger yield obtained in low-multiplicity events is subtracted from the one in high-multiplicity events. The excess on the near-side is qualitatively similar to that recently reported by the CMS Collaboration, while the excess on the away-side is reported for the first time. The two-ridge structure projected onto azimuthal angle is quantified with the second and third Fourier coefficients as well as by near-side and away-side yields and widths. The yields on the near side and on the away side are equal within the uncertainties for all studied event multiplicity and p(T) bins, and the widths show no significant evolution with event multiplicity or p(T). These findings suggest that the near-side ridge is accompanied by an essentially identical away-side ridge. (c) 2013 CERN. Published by Elsevier B.V. All rights reserved.719416992941State Committee of ScienceCalouste Gulbenkian Foundation from LisbonSwiss Fonds Kidagan, ArmeniaFinanciadora de Estudos e Projetos (FINEP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)National Natural Science Foundation of China (NSFC)Chinese Ministry of Education (CMOE)Ministry of Science and Technology of China (MSTC)Ministry of Education and Youth of the Czech RepublicDanish Natural Science Research CouncilCarlsberg FoundationDanish National Research FoundationThe European Research Council under the European Community's Seventh Framework ProgrammeHelsinki Institute of PhysicsAcademy of FinlandFrench CNRS-IN2P3, France'Region Pays de Loire', France'Region Alsace', France'Region Auvergne', FranceCEA, FranceGerman BMBFHelmholtz AssociationGeneral Secretariat for Research and Technology, Ministry of Development, GreeceHungarian OTKANational Office for Research and Technology (NKTH)Department of Atomic Energy of the Government of IndiaDepartment of Science and Technology of the Government of IndiaIstituto Nazionale di Fisica Nucleare (INFN), ItalyCentro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi", ItalyMEXTJoint Institute for Nuclear Research, DubnaNational Research Foundation of Korea (NRF)CONACYT, MexicoDGAPA, MexicoALFA-ECHELEN Program (High-Energy physics Latin-American-European Network)Stichting voor Fundamenteel Onderzoek der Materie (FOM), NetherlandsNederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), NetherlandsResearch Council of Norway (NFR)Polish Ministry of Science and Higher EducationNational Authority for Scientific Research - NASR (Autoritatea Nationala pentru Cercetare Stiintifica - ANCS)Ministry of Education and Science of Russian FederationInternational Science and Technology CenterRussian Academy of SciencesRussian Federal Agency of Atomic EnergyRussian Federal Agency for Science and InnovationsCERN-INTASMinistry of Education of SlovakiaDepartment of Science and Technology, South AfricaCIEMATEELAMinisterio de Educacion y Ciencia of SpainXunta de Galicia (Conselleria de Educacion)CEADENCubaenergia, CubaIAEA (International Atomic Energy Agency)Swedish Research Council (VR)Knut & Alice Wallenberg Foundation (KAW)Ukraine Ministry of Education and ScienceUnited Kingdom Science and Technology Facilities Council (STFC)The United States Department of EnergyUnited States National Science FoundationState of OhioState of TexasConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
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