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ALICE experiment at LHC (JINR participation)

ALICE experiment at LHC (JINR participation). Collaboration; Detector Construction; Physics tasks; Groups; JINR team & JINR member-states Computing;. Study of Quark-Gluon Plasma is the main goal of ALICE experiment. ALICE Collaboration. ~ 1000 Members (63% from CERN MS)

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ALICE experiment at LHC (JINR participation)

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  1. ALICEexperiment at LHC(JINR participation) Collaboration; Detector Construction; Physics tasks; Groups; JINR team & JINR member-states Computing;

  2. Study of Quark-Gluon Plasma is the main goal of ALICE experiment

  3. ALICE Collaboration ~ 1000 Members (63% from CERN MS) ~30 Countries ~100 Institutes~ 150MCHF capital cost (+ ‘free’ magnet)

  4. ALICE Set-up Size: 16 x 26 meters Weight: 10,000 tons TOF TRD HMPID ITS PMD Muon Arm PHOS TPC

  5. Very Large Dipole Magnet for Muon Spectrometer (9 x 7 x 3.5 m; 800 ton)

  6. Transition Radiation Detector (assembly of supermodule)

  7. 1st Module of Photon Spectrometer (~ 4000 PWO crystals)

  8. JINR team Pavel AKICHINE, Vladimir APRAKSIN, Valentin AREFIEV, Valery ASTAKHOV, Anton BALDIN, Victor BARTENEV, Boris BATYUNYA, Nicolay BLINOV, Mariana BONDILA, Zemfira BORISSOVSKAIA, Yuri BUGAENKO, Vladimir BUDILOV, Zhelyu BUNZAROV, Sergey CHERNENKO, Vladimir DATSKOV, Igor DODOKHOV, Valery DODOKHOV, Leonid EFIMOV, Alexander EFREMOV, Oleg FATEEV, Oleg FEDOROV, Anatoly FEDUNOV, Andrei GHEATA, Mihaela GHEATA, Oleg GOLUBITSKI, Lucia JANCUROVA, Vladimir KADYSHEVSKY, Dmitry KALASHNIKOV, Vladimir KAPLIN, Evgeny KISLOV, Evgeny KOSHURNIKOV, Boris KRASNOV, Mikalai KUTOUSKI, Vladimir LIOUBOCHITS, Victor LOBANOV, Alexander MAKAROV, Alexander MALAKHOV, Lyudmila MALININA, Henryk MALINOVSKI, Evgeny MATYUSHEVSKI, Konstantin MIKHAILOV, Yuri MINAEV, Valery MITSYN, Ciprian MITU, Galina NAGDASEVA, Alexander NESTEROV, Petr NOMOKONOV, Irina OLEX, Yuri PANEBRATTSEV, Alexander PARFENOV, Maria PASYUK Vladimir PENEV, Victoriya PISMENNAYA, Timur POTCHEPTSOV, Sergey SEMASHKO, Adrian SEVCENCO, Galina SHABRATOVA, Alexei SHABUNOV, Igor SHELAEV, Alla SHKLOVSKAYA , Alexei SHURYGIN, Maria SHURYGINA, Yuri SHYSHOV, Nicolay SLAVIN, Lev SMYKOV, Mais SULEYMANOV, Yuri TYATYUSHKIN, Martin VALA, Alexandre VODOPIANOV, Vladimir YUREVICH, Yuri ZANEVSKIY, Sergey ZAPOROZHETS, Nicolay ZHUKOV, Alexander ZINCHENKO, Oleg YULDASHEV

  9. JINR contribution to ALICE detector construction (1.7%) Item KCHF • Muon Magnet 1025 • Photon Spectrometer 870 • Transition Radiation Detector 260 • Common Items 244 __________________________________ Total: 2489

  10. ALICE Physics TeamsALICE PPR V1: J. Phys. G: Nucl. Part. Phys. 30, 1517 (2004);V2: 32, 1295-2040 (2006) • Heavy ion observables in ALICE • Particle multiplicities • Particle spectra • Particle interferometry • Resonance production • Jet physics • Direct photons • Dileptons • Heavy-quark and quarkonium production • p-p and p-A physics in ALICE • Physics of ultra-peripheral heavy ion collisions • Contribution of ALICE to cosmic-ray physics

  11. Vector meson production: ( puzzle) Predicted effect of partial chiral symmetry restoration (M.Asakawa, C.M.Ko LBL-35724, 1994). The shift of mass depends from the temperature T. SPS  l n  (e+e-) l - from early stage (QGP) n - from late stage (freeze-out) NA50/NA49: dN/dy(+-) / dN/dy(K+K-)  2 (1.8 - AMPT model); NA50:T = 227±10 MeV , NA60: 253±2 MeV(228 MeV from the AMPT), NA49:TKK = 305±15 MeV (267 MeV from the AMPT).

  12. Simulation results for K+K- in Pb-Pb 106 central events in ALICE using ITS, TPC and TOF. (B.Batyunya, A.De Caro, G.Paic, A.Pesci. S.Zaporozhets. Phys.Part.Nucl.Lett. v2, N2 (125) 72, 2005; B. Alessandro et al. ALICE PPR. J.Phys.G, V.32, p.1613) n S/B = 0.053 ± 0.0007 l Fit parameters: M=1019.6±0.04 width=4.3±0.1 The resonance peak after subtraction of the background. The double peak resolution possibility in ALICE.

  13. K+K- from 105 p-p events at 14 TeV obtained in GRID production including JINR;(preliminary; B.Batyunya, M.Vala)  Effective mass for K+K- pairs and background from mixed events. S/B = 0.14  background K+K- signal after background subtraction. Fit (gauss): M = 1.020+0.001 GeV,  = 2.500  0.001 MeV

  14. Simulation results for dielectron decays of ,  and J/ in 107 central Pb-Pb events using ITS, TPC and TRD in ALICE. (B.Batyunya, M.Vala, S.Zaporozhets. Talk in First International Workshop on Soft Physics in Ultrarelativistic Heavy Ion Collisions. Catania, 2006.) S/B= (0.13 - 0.15)

  15. Particle momentum correlations (as HBT effect in astronomy). Due to the effects of quantum statistics (QS) and final state interaction (FSI), the momentum correlations of two or more particles at small relative momenta in their center-of-mass system are sensitive to the space-time characteristics of the production process so serving as a correlation femtoscopy tool. q = p1- p2 , x = x1- x2 w=1+cos qx S is signal and B is background (from mixed events). . The corresponding correlation widths are usually parameterized in terms of the Gaussian correlation radii Ri: side out transverse pair velocity vt long beam

  16. Study of influence of particles identification and momentum resolutions effects in ALICE detectors on correlation function (CF) ( L.Malinina, B.Batyunya, S.Zaporozhets. NUCLEONIKA 2004;49(Supplement 2)S99-S102 ). The simulation has been done using HIJING model, GEANT-3 - ALIROOT packages for ITS and TPC and Lednitsky’s algorithm for calculation of particle correlations. Preliminary results for (K+K-) pairs with taking into account the TPC tracking efficiency and resolution. TPC results for Qinv dependence of the CF, CF = 1 + *exp(-Qinv2R2), for () pairs at pt < 1 GeV/c of pions. Fit parameters: p0 = , p1 = R 100 %

  17. Momentum correlations for two like-sign pions. Predictions of Universal Hydro-Kinetic Model ( N.Amelin, R.Lednicky, L.Malinina et al.) kt dependences of correlation radii and parameter : the triangle points - UHKM results, the open points - STAR measurements. Influence of resonance decays to the correlation function parameters in the UHKM model (preliminary). The discrepancy for the  relates to an absence of particle identification efficiency in the model.

  18. Study of heavy quarkonia production in pA collisions at the LHC energyC.Mitu (Romania), A.Sevcenko (Romania), G. Shabratova, A.Zinchenko pm>1GeV/c pm>2GeV/c pA 2005 2006

  19. Study of heavy quarkonia production in pA collisions at the LHC energy cc contribution to the BGR at pm>1GeV/c bb contribution to the BGR at pm>1GeV/c 2005 2006

  20. Software development • Comparison of the simulation results in frameworks of Geant3 and Fluka transport codes into AliRoot: A.Zinchenko, G.Shabratova - The code of strip alignment in PHOS modules is under insertion into AliRoot: V. Pismennaya, T.Pocheptsov, G.Shabratova, A.Zinchenko - The update of PHOS code in AliRoot in accordance with strict roles of C++. Graphics development in ROOT: T.Pocheptsov

  21. Alignment objects

  22. Graphics development in ROOT (ROOT GL) Box cuts On TH3 the 2D contour is drawn in real time on the cutting plane. Possibility to paint TH3 using iso-surfaces (iso-3D contours).

  23. RDIG sites for ALICE

  24. Management and financial support ALICE GRID Collaboration Belarus, Minsk Romania, ISS Slovakia, Koshice IHEP KI JINR LHE & LIT PNPI ITEP INR MEPHI SINP SPbSU New participant

  25. Resources statistics • Resources contribution (normalized Si2K units): 50% from T1s, 50% from T2s • The role of the T2 remains very high! • JINR – 0.68% in 2006⇛ 0.46% in 2007 • RDIG - ~6% in 2006⇛ 7.2% in 2007

  26. Requirements to resources at JINR in 2007-2010 from ALICE Simulation & Analysis

  27. CERN-INTAS grant • INTAS Ref. No : 05-103-7484 • Project Title : Preparation for data taking and distributed analysis for the ALICE experiment at LHC. • Proposal Coordinator: Yves Schutz (CERN)

  28. Participation of young physicists & students in ALICE JINR team • Belorussia 1 person • Slovakia 2 persons; • Russia 3 persons; Physicists from a number of JINR member-states take part in ALICE physics via JINR: Azerbaijan; Bulgaria; Mongolia; Joint research with JINR member-states physicists within ALICE groups: Armenia; Poland; Romania; Russia; Ukraine

  29. CONCLUSION • Participation of JINR team in ALICE physics is based on: • Contribution to design and construction of particular ALICE sub-detectors; • Long term participation in the physics and detector simulation; • Practical knowledge and experience in using of distributed computing (GRIID) for data analysis. • JINR team has leading positions in some physics tasks. A few physics groups were organized in ALICE . Convener of one of these groups is JINR physicist Y. Belikov. • JINR has responsibility for the ALICE Computing in Russia. • JINR team presents scientific results on workshops & conferences. • Adequate funding for exploitation costs (setup and sub-detectors PHOS and TRD) and travel have to be provided. • It is planned that the most of the data analysis carried by JINR, will be done at Dubna. Computing power has to be increased by about 10 times.

  30. Future plans in 2007-2008 years • Simulation of pp and Pb-Pb collision from 0.9 TeV • till nominal LHC energies: • 1.1. Vector mesons and quarkonia production • decaying to m+m- and e-e+ pairs with adequate • understanding of background conditions; • 1.2. Study of direct photon and pi0 production • with suitable background environment • 1.3. Momentum correlations (femtoscopy): • - Study of influence of particle identification and resonance • decays using the UHKM code . • Participation in the data taking. • Start the data analysis.

  31. С П А С И Б О ЗА ВНИМАНИЕ

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