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The PHENIX/RHIC and TOTEM/LHC Experiments Status and Hungarian activities

+. The PHENIX/RHIC and TOTEM/LHC Experiments Status and Hungarian activities. M. Csanád for PHENIX/Hu & TOTEM/Hu. Heavy Ion Physics. Recreate conditions similar to those at the Big Bang Explore quark matter. The Relativistic Heavy Ion Collider.

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The PHENIX/RHIC and TOTEM/LHC Experiments Status and Hungarian activities

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  1. + The PHENIX/RHIC and TOTEM/LHC ExperimentsStatus and Hungarian activities M. Csanád for PHENIX/Hu & TOTEM/Hu

  2. Heavy Ion Physics • Recreate conditions similar to those at the Big Bang • Explore quark matter

  3. The Relativistic Heavy Ion Collider • RHIC: Brookhaven Nat’l Lab: Au+Au, Cu+Cu, d+Au, p+p • 4 experimental collab’s: STAR, PHENIX, BRAHMS, PHOBOS • Institutional membership in PHENIX • RMKI, Eötvös University, Debrecen University

  4. Collision modes, recorded data • Two independent rings • Separate magnetic field • Proton polarization • Many different modes • 9.2 GeV/n (Au) • 22 GeV/n (Au, Cu, p) • 56 GeV/n (Au) • 62 GeV/n (Au, Cu, p) • 130 GeV/n (Au) • 200 GeV/n (Au, Cu, p) • 410 GeV/n (p) • 500 GeV/n (p) • Energyscan program: QCD phase diagram • Science • >1000 refereed papers, >24000 independent citations • Discoveries • The future: e-RHIC & RHIC II • Identified key scientific questions, started upgrades Recorded events in millions

  5. The RHIC complex • Tandem • a: Tandem to Booster • b: Linac • Booster • Alternating Gradient Synchrotron • AGS to RHIC • RHIC

  6. PHENIX setup • Tracking, calorimetry, identification • Charged hadrons ( π±, K±, etc.) • Photons, direct or decay (→ η , π0) • Light mesons φ, ω and η • Single leptons → heavy flavor • Di-leptons → heavy flavor, J/Ψ

  7. Toward BBC Toward ZDC Spectators Participants Centrality determination • Overlapping region: participants • Evaporated neutrons: toward ZDC (charged wiped out) • Participants: new particles toward BBC • Centrality: EZDC versus QBBC

  8. Collisions of different centrality Central Peripheral

  9. A PHENIX Event

  10. Particle yield in A+A RAA= × Number of p+p collisions Particle yield in p+p The first milestone: nuclear modification Nucleus+nucleus Proton+proton Simply just more? A+A = many p+p?

  11. Suppression of high energy particles • Peripheral Au+Au and d+Au: no suppression • Central Au+Au: large suppression Phys.Rev.C76, 034904 (2007)

  12. Strongly interacting medium • Hadrons suppressed, photons not! • Strong interaction in the medium Peripheral Central Phys.Rev.Lett.94, 232301 (2005)

  13. φ Perfect fluid of quarks • Elliptic flow measures azimuthal asymmetry, v2 • Hydro picture: collective evolution, v2>0 • Even heavy flavour flow: perfect hydro confirmed • Scaling of elliptic flow with constituent quark number • Flow versus kinectic energy for several hadrons Phys.Rev.Lett.98, 162301 (2007)

  14. Temperature from direct photons • Photons fly out of the medium: penetrating probe • Information on the temperature • Tinitial at least 2-300 MeV • Quark-hadron trans. at ~170 MeV Thermalization, expansion, cooling …… Freeze-out Phys. Rev. Lett. 104, 132301 (2010)

  15. The TOTEM experimentat LHC • Measure p+pstot± 1 mb, luminosity-independently • Elastic scattering at t  10-3 GeV2 • Inelastic rates as well • Measure dstot/dt10-3 – 101 GeV2 • Measure LHC luminosity precisely • Measure diffractive dissociation • single, double diffraction, multiple Pomeron exchange

  16. TOTEM Setup • At the CMS interaction point • Three detectors: Roman Pot, Telescope 1, Telescope 2

  17. Proton-proton scattering at the LHC • Different proc. in p+p • Elastic, diffractive, inelastic • Trigger: large rapidity

  18. Roman Pot detectors of TOTEM • Special „edgeless” design to move close to beam • Distance ~ 10 s • Reconstruct from there

  19. Differential cross-section atb*=3.5 m • Measured over a large |t| range, will be extended • Dip-hump structure first seen at ISR, also present here • Compared to models • Exponent: 7.8 ± 0.3 • Slope: 23.5 ± 0.5 GeV˗2 • Dip: 0.53 ± 0.5 GeV2 EPL, 95 (2011) 41001

  20. Total cross-section resultsatb*= 90 m • Special LHC optics, agreement w/ previousmeasurement • Result from t=0 extrapolation: stot = (98.3 ±0.2stat +2.82.7) mb sinel = (73.5 ±0.6stat +1.81.3) mb sel = (24.8 ±0.2stat ±1.2) mb CERN-PH-EP-2011-158

  21. + Thank You for your attention

  22. The PHENIX/Hu group • >20 PHENIX talks • >50 internalworkinggrouptalks • ~15 analysisnotes • 11 paperswithdirectparticipation (papergroup) • http://phenix.elte.hu • http://phenix.kfki.hu

  23. The TOTEM/Hu group • Tasksduringsetup: DAQ, data monitoring, Roman Pot • Phyicsprojectsontheway, e.g. dsel/dt • Workingcloselytotheorygroups

  24. Elasticscatteringslopeatlow t • Theoreticalpredictionsdifferinmanyaspects

  25. Single diffraction low  = p/p

  26. Single diffraction large 

  27. Double POMERON exchange

  28. Double POMERON exchange

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