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Relativistic Heavy Ions ALICE/CERN

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Relativistic Heavy Ions ALICE/CERN. Kristjan Gulbrandsen Niels Bohr Institute - Discovery. QCD Phase Diagram. CERN – The Large Hadron Collider. Creating the Early Universe. Nucleus Collisions. Detecting a Collision. A Large Ion Collider Experiment. Time Projection Chamber (TPC).

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  1. Relativistic Heavy IonsALICE/CERN KristjanGulbrandsen Niels Bohr Institute - Discovery

  2. NUPECC Meeting - June 15 2012

  3. QCD Phase Diagram NUPECC Meeting - June 15 2012

  4. CERN – The Large Hadron Collider NUPECC Meeting - June 15 2012

  5. Creating the Early Universe NUPECC Meeting - June 15 2012

  6. Nucleus Collisions NUPECC Meeting - June 15 2012

  7. Detecting a Collision NUPECC Meeting - June 15 2012

  8. A Large Ion Collider Experiment NUPECC Meeting - June 15 2012

  9. Time Projection Chamber (TPC) • Measure position and momentum • Particle Identification NUPECC Meeting - June 15 2012

  10. TPC Laser • Beam split into 336 laser tracks • Unaffected by magnetic field • Crucial for knowledge of drift time • Exact positions known NUPECC Meeting - June 15 2012

  11. TPC PbPb Event NUPECC Meeting - June 15 2012

  12. Strong Hydrodynamics • Asymmetry region of interaction • Produces asymmetric distribution of particles • Requires interactions • Can measure this final asymmetry (v2) • Related to viscosity of the medium • Higher order correlations indicate hydrodynamical behavior Duke – Jetlab – Cold Atoms http://www.phy.duke.edu/research/photon/qoptics/news/stronginter/index.html NUPECC Meeting - June 15 2012

  13. Forward Multiplicity Detector • Only detector in ALICE with high segmentation at high |η| • 51200 silicon strips - radial and azimuthal segmentation • position and energy information • Hit information can be used in p+p for particles detection • Energy information used in Pb+Pb (high occupancy) Interaction Point NUPECC Meeting - June 15 2012

  14. dN/dh versus h • Can measure distribution of produced particles • High h appears to show universal behavior • Most energy goes into production of particles at midrapidity • ~ 18000 particles produced in central collision, 15 GeV/fm3 energy density • First order measurement • higher orders can give more information NUPECC Meeting - June 15 2012

  15. Long Range Correlations (LRC) • How much does each side of the interaction communicate? • Not calculable from theory • Much information contained about the internal dynamics NUPECC Meeting - June 15 2012

  16. Proton Collision Processes NUPECC Meeting - June 15 2012

  17. Summary • Active analysis crucial to understanding the QGP • Bulk properties and correlations are key topics • p-p data analyzed to gain deeper understanding of baseline interactions • Analyses will feed back into models • Gives understanding of initial state of Pb-Pb collisions Divide out initial state Do we understand the initial state? NUPECC Meeting - June 15 2012

  18. Future • p-Pb run November this year! • New opportunities to studynuclear matter in novel state(gluon saturation) • Shed light on possiblecomplication to understandingthe initial state of these collisions • Current measurement methods ready to be applied to p-Pb NUPECC Meeting - June 15 2012

  19. HEHI Group in 2012 Perm. Staff: Ian Bearden Hans Bøggild Jens Jørgen Gaardhøje Børge Svane Nielsen Temp. Staff: Christian Holm Christensen Kris Gulbrandsen PostDocs: Ante Bilandzic (from 2/2) Marek Chojnacki (from 7/5) Hans Hjersing Dalsgaard Casper Nygaard (to 30/6) Ph. D. students: Alexander Hansen Carsten Søgaard (to 30/6) Valentina Zaccolo Undergradstudents: LeireArriola Peter Jochumzsen Bastian Poulsen Thomas Schwanberger Techn.& Eng.: Henrik Bertelsen Aksel Boiesen Jimmy K. Hansen Jørn Westergaard Funded By: -Danish Natural Science Research Council(FNU) -Danish Basic Research Foundation (GF) -Carlsberg Foundation NUPECC Meeting - June 15 2012

  20. Backup Slides NUPECC Meeting - June 15 2012

  21. TPC Momentum Resolution NUPECC Meeting - June 15 2012