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WA98 ALICE

Relativistic Heavy Ion Collisions From SPS to LHC NA49 WA98 ALICE Victor Trubnikov Andrzej Soltan Institute for Nuclear Studies. PHOS (PHOton Spectrometer) is a high resolution electromagnetic calorimeter consisting of 17920 detection channels based on lead-tungstate crystals(PWO).

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WA98 ALICE

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  1. Relativistic Heavy Ion CollisionsFrom SPS to LHCNA49 WA98 ALICEVictor Trubnikov Andrzej Soltan Institute for Nuclear Studies

  2. PHOS (PHOton Spectrometer) is a high resolution electromagnetic calorimeter consisting of 17920 detection channels based on lead-tungstate crystals(PWO). WA98 ALICE A.Deloff1 T.Dobrowolski4H.Liu1 K.Karpio1 H.Malinowski5 M.Malek6 KRedlich7T.Siemiarczuk1 GStefanek2 L.Tykarski2O.Utyuzh1 G. Wilk1 1 – IPJ 2-A.S., Kielce 3– PW 4 – Butcher Foundation 5 – Inst. Elektrotechniki, Lublin 6 – Univ. Paryski 7 – Uniw. W rocławski H.Liu1 K.Karpio1 T.Siemiarczuk1 G.Stefanek2 L.Tykarski3

  3. PUBLIKACJE • 1.M.M.Aggarwal,...,K.Karpio,T.Siemiarczuk et al. (128 autorów) • Centrality and Transverse Momentum Dependence of Collective Flow in 158 AGeV • Pb+Pb Collisions • Nucl. Phys. A762(2005)129-146 WA98 • 2. M.M.Aggarwal,..., K.Karpio,T.Siemiarczuk et al. (130 autorów) • Azimuthal Anisotropy of Photon and Charged Particle Emission ii Pb+Pb Collisions • at 158 A GeV • Eur. Phys. J. C41(2005) 287-296 WA98 • 3. D. Aleksandrov,…,A. Deloff, K.Karpio, T.Siemiarczuk, G. Wilk et al. (55 autorów) • A High Resolution Electromagnetic Calorimeter based on Lead-Tungstate Crystals • Nucl. Instrum. and Methods in Phys. Res. A550(2005)169-184 ALICE • 4. P.Cortese,...,A.Deloff, K.Karpio, T.Siemiarczuk, G. Wilk et al. (865 autorów) • ALICE Report on Computing • ALICE Collaboration,, ALICE TDR-12, Raport CERN, CERN/LHCC-2005-018, • 2005, 83strony ALICE • 5. P. Cortese,..., A. Deloff, K.Karpio, T.Siemiarczuk, G. Wilk et al. (865 autorów) • ALICE Physics Performance Report, vol. II • wysłane do Journal of Physics G, 1127 stron ALICE • 6. M.M. Aggarwal,…,H. Liu, K.Karpio, T.Siemiarczuk et al. (130 autorów) • Interferometry of Protons and Deuterons from 158 A GeV Pb+Pb Collisions Studied • with the Plastic Ball • praca przygotowana do druku w Eur. Phys. J. C, 16 stron WA98 • 7. M.M. Aggarwal,…, H. Liu, K.Karpio, T.Siemiarczuk et al. (130 autorów) • Surface Emission of Soft π+ Mesons in Central Pb+Pb Collisions at 158 A GeV • Studied via Two-pion Interferometry • praca w przygotowaniu do druku w Eur. Phys. J. C, 15 stron WA98 • praca doktorska: • Liu Han,”The Fermi-Dirac and Bose-Einstein interferometry of protons and deuterons from • 158 A GeV Pb+Pb collisions studied with the Plastic Ball”, obrona odbyła się 8 lipca 2005 r.

  4. WA98 Collective flow of photons in 158AGeV PbPb collisions measured with LEDA spectrometer of the WA98 experiment at CERN SPS 1 Reaction plane method EVENT PLANE calculated using charged particles mesured in the Plastic Ball spectrometer - transverse energy of i-th particle, – azimuthal angle Fourier decomposition of the azimuthal angle ΔΦ V1 – direct flow V2 - elliptic flow 2 Correlation method

  5. WA98 Conclusions • Scaled V2 depends only on the initial energy density rather than being dependent on the particle density times path length, which would be the expectation if only partial thermalization was attained. • The observed increase of the elliptic flow with increasing particle density is qualitatively similar to the prediction of resent hydrodinamical model study by Teaney, Lauret and Shuryak with an equation of state which includes a transition to a QGP at a critical temperature of 165 MeV and a latent heat of 800 MeV. Elliptic flow

  6. Interferometry of π+, protons and deuterons from 158 AGeV Pb+Pb collisions studied with the PlasticBall The approximate A/ and A/ scalings are observed for the overall R and longitudinal RL radius parameters, respectively, with A = 3 fm GeV1/2…

  7. The NA49 EXPERIMENT Data on pp, pPb, PbPb Helena Bialkowska Bozena Boimska Victor Trubnikov

  8. Publikacje naukowe: 1.SYSTEM SIZE AND CENTRALITY DEPENDENCE OF THE BALANCE FUNCTION IN A+A COLLISIONS AT SNN=17.2 GeV. NA49 Collaboration (C.Alt, H.Białkowska, B.Boimska, V.Trubnikov et al.(101)) Opublikowane w Phys.Rev.C71:034903,2005 2.SYSTEM-SIZE DEPENDENCE OF STRANGENESS PRODUCTION IN NUCLEUS-NUCLEUS COLLISIONS AT SNN=17.3 GeV. NA49 Collaboration (C.Alt, H.Białkowska, B.Boimska, V.Trubnikov et al.(102)) Opublikowane w Phys.Rev.Lett.94:052301,2005 3. W- AND ANTI-W+ PRODUCTION IN CENTRAL Pb+Pb COLLISIONS AT 40 AND 158 AGeV. NA49 Collaboration (C.Alt, H.Białkowska, B.Boimska et al.(101)) Opublikowane w Phys.Rev.Lett.94:192301,2005 4. INDICATIONS FOR THE ONSET OF DECONFINEMENT IN Pb+Pb COLLISIONS AT THE CERN SPS FROM NA49. NA49 Collaboration (P.Seyboth, H.Białkowska, B.Boimska et al.(99)) Opublikowane w Acta Phys.Polon.B36:565-573,2005 5. MULTIPLICITY FLUCTUATIONS IN NUCLEAR COLLISIONS AT 158 AGeV. NA49 Collaboration (M. Rybczyński, H.Białkowska, B.Boimska, V.Trubnikov et al.(102)) Opublikowane w J.Phys.Conf.Ser.5:74-85,2005 6. INDICATIONS FOR THE ONSET OF DECONFINEMENT IN NUCLEUS-NUCLEUS COLLISIONS. NA49 Collaboration (D.Flierl, H.Białkowska, B.Boimska, V.Trubnikov et al.(101)) Opublikowane w AIP Conf.Proc.756:433-435,2005 7. REVIEW OF RESULTS FROM THE NA49 COLLABORATION. NA49 Collaboration (C.Blume, H.Białkowska, B.Boimska, V.Trubnikov et al.(102)) Opublikowane w J.Phys.G31:S685-S692,2005 8. ENERGY DEPENDENCE OF STRANGENESS PRODUCTION. NA49 Collaboration (V.Friese, H.Białkowska, B.Boimska, V.Trubnikov et al.(102)) Opublikowane w J.Phys.G31:S911-S918,2005

  9. 9. EVENT-BY-EVENT FLUCTUATIONS OF PARTICLE RATIOS IN CENTRAL Pb+Pb COLLISIONS AT 20 - 158 AGeV. NA49 Collaboration (C.Roland, H.Białkowska, B.Boimska, V.Trubnikov et al.(102)) Opublikowane w J.Phys.G31:S1075-S1078,2005 10. SYSTEM SIZE DEPENDENCE OF HADRON PRODUCTION IN A+A COLLISIONS AT 40 AGeV BEAM ENERGY. NA49 Collaboration (P.Dinkelaker, H.Białkowska, B.Boimska, V.Trubnikov et al.(102)) Opublikowane w J.Phys.G31:S1131-S1136,2005 11. INCLUSIVE PRODUCTION OF CHARGED PIONS IN p+p COLLISIONS AT 158 AGeV/c BEAM MOMENTUM. NA49 Collaboration (C.Alt, H.Białkowska, B.Boimska, V.Trubnikov et al.(72)) e-print: hep-ex/0510009, zaakceptowane do publikacji w Eur.Phys.J.C 12. UPPER LIMIT OF D0 PRODUCTION IN CENTRAL Pb-Pb COLLISIONS AT 158 AGeV. NA49 Collaboration (C.Alt, H.Białkowska, B.Boimska, V.Trubnikov et al.(91)) e-print: nucl-ex/0507031, skierowane do publikacji w Phys.Rev.C 13. NA49 RESULTS ON HADRON PRODUCTION: INDICATIONS OF THE ONSET OF DECONFINEMENT? NA49 Collaboration (B. Lungwitz, H.Białkowska, B.Boimska, V.Trubnikov et al.(93)) e-print: nucl-ex/0509041, prezentowane na 35th International Symposium on Multiparticle Dynamics (ISMD05), Kromeriz, Czechy, sierpień 2005 . 14. RESULTS FROM NA49. NA49 Collaboration (C. Hohne, H.Białkowska, B.Boimska, V.Trubnikov et al.(93)) e-print: nucl-ex/0510049, prezentowane na 18th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (QM 2005), Budapeszt, Węgry, sierpień 2005. 15. HIGH PT SPECTRA OF IDENTIFIED PARTICLES PRODUCED IN Pb+Pb COLLISIONS AT 158 GeV/NUCLEON BEAM ENERGY. NA49 Collaboration (C. Alt, H.Białkowska, B.Boimska, V.Trubnikov et al.(93)) e-print: nucl-ex/0510054, prezentowane na 18th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (QM 2005), Budapeszt, Węgry, sierpień 2005. 16. ELLIPTIC FLOW OF  HYPERONS IN Pb+Pb COLLISIONS AT 158 AGeV. NA49 Collaboration (G. Stefanek, H.Białkowska, B.Boimska, V.Trubnikov et al.(93)) e-print: nucl-ex/0510067, prezentowane na 18th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (QM 2005), Budapeszt, Węgry, sierpień 2005.

  10. s-production vs system-size Strange particle production • 158 AGeV • fast increase for small systems, saturation from Npart > 60 on! lines to guide the eye [NA49, PRL 94, 052301 (2005)]

  11. Study of „high” PT identified particles Vo’s from decay Via decay topology Reconstruction of decay vertex and invariant mass calculation Charged particles from dE/dx Solid curve – Blast Wave parametrization

  12. For comparison: results on pp and PbPb collisions Invariant Cross Section as a function of Pt at fixed Xf For Pi+ and Pi- (published) Invariant Cross Section as a function of Pt at fixed Xf For Pi+ and Pi- ( not published)

  13. PHOS (PHOton Spectrometer) is a high resolution electromagnetic calorimeter consisting of 17920 detection channels based on lead-tungstate crystals(PWO) ALICE: electromagnetic calorimeter PHOS. Crystal detector unit

  14. Assembling of the first PHOS module (3584 channels) is currently under way at CERN: Tadeusz Marszał (mechanical assembling), Magda Malek (tests of electronics) Polish investment : Detector Crystals, electronics, simulations, assembling (mechanical)Financial sources : SPUB

  15. Resolution of the detector + 12C  0 + X  2 + X PS CERN (0)=8.4 MeV (0)=4.7 MeV

  16. Centrality detectors Tiles Silicon strips Beam-Beam counters Zerodegreecalorimeters Twomovable spectrometers Midrapidity spectrometer Forward Spectrometer PHOS module @ BRAHMS • Broad RAnge Hadron Magnetic Spectrometer PHOS A possibility of using the first PHOS module in BRAHMS during RHIC Run-6 is under consideration. Boundary condition  there is no interference with the ALICE schedule

  17. WA98 Collective flow of photons in 158AGeV PbPb collisions measured with LEDA spectrometer of the WA98 experiment at CERN SPS 1 Reaction plane method EVENT PLANE calculated using charged particles mesured in the Plastic Ball spectrometer - transverse energy of i-th particle, – azimuthal angle Fourier decomposition of the azimuthal angle ΔΦ V1 – direct flow V2 - elliptic flow 2 Correlation method

  18. WA98 Elliptic flow

  19. WA98 Collective flow of photons in 158AGeV PbPb collisions measured with LEDA spectrometer of the WA98 experiment at CERN SPS 1 Reaction plane method EVENT PLANE calculated using charged particles mesured in the Plastic Ball spectrometer - transverse energy of i-th particle, – azimuthal angle Fourier decomposition of the azimuthal angle ΔΦ V1 – direct flow V2 - elliptic flow 2 Correlation method

  20. PHOS general structure Crystal detector unit PHOS module Working temperature: -25 oC • Modular structure • 5 independentmoduleseachof 3584crystal detector units: • PWO crystal+ APD+ preamp. Strip unit of 16 detector units PHOS Cradle

  21. PHOS provides unique coverage of the following physics topics: -study initial phase of the collision of heavy nuclei via direct single photons and diphotons, -jet-quenching as a probe of deconfinement, studied via high pTγ and π0, -signals of chiral-symmetry restoration. Technical data: 17920 lead-tungstate crystals(PWO) -distance to IP 4400mm -coverage in pseudorapidity -0.12;+0.12 -coverage in azimuthal angle 100o -crystal size 22x22x180 mm3 -depth in radiation length 20 -modularity 5 modules -total area 8m2 -total crystal weight 12.5 t -operating temperature -25 oC -photoreadout APD

  22. Nuclear modification factor

  23. The PHOS-256 calorimeter: (A) detector, cooling system, (B) closed detector with CPV, (C)crystal matrix, (D) close-up of the CPV.

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