relativistic heavy ions alice/cern
DESCRIPTION
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). - PowerPoint PPT PresentationTRANSCRIPT
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Relativistic Heavy IonsALICE/CERN
Kristjan GulbrandsenNiels Bohr Institute - Discovery
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QCD Phase Diagram
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CERN – The Large Hadron Collider
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Creating the Early Universe
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Nucleus Collisions
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Detecting a Collision
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A Large Ion Collider Experiment
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Time Projection Chamber (TPC)
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Measure position and momentumParticle Identification
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TPC Laser
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Beam split into 336 laser tracks
Unaffected by magnetic field
Crucial for knowledge of drift time
Exact positions known
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TPC PbPb Event
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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
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Duke – Jetlab – Cold Atomshttp://www.phy.duke.edu/research/photon/qoptics/news/stronginter/index.html
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Forward Multiplicity Detector
Only detector in ALICE with high segmentation at high |η|51200 silicon strips - radial and azimuthal segmentationposition and energy informationHit information can be used in p+p for particles detectionEnergy information used in Pb+Pb (high occupancy)
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Interaction Point
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dN/dh versus hCan measure distribution of produced particlesHigh h appears to show universal behaviorMost energy goes into production of particles at midrapidity
~ 18000 particles produced in central collision, 15 GeV/fm3 energy densityFirst order measurement
higher orders can give more information
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Long Range Correlations (LRC)How much does each side of the interaction communicate?Not calculable from theoryMuch information contained about the internal dynamics
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Proton Collision Processes
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SummaryActive analysis crucial to understanding the QGPBulk properties and correlations are key topicsp-p data analyzed to gain deeper understanding of baseline
interactionsAnalyses will feed back into modelsGives understanding of initial state of Pb-Pb collisions
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Divide outinitial state
Do we understandthe initial state?
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Future
p-Pb run November this year! New opportunities to study
nuclear 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
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HEHI Group in 2012
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Perm. Staff:Ian BeardenHans BøggildJens Jørgen GaardhøjeBørge Svane Nielsen
Temp. Staff: Christian Holm ChristensenKris Gulbrandsen
PostDocs: Ante Bilandzic (from 2/2) Marek Chojnacki (from 7/5)Hans Hjersing DalsgaardCasper Nygaard (to 30/6)
Ph. D. students: Alexander HansenCarsten Søgaard (to 30/6)Valentina Zaccolo
Undergradstudents: Leire ArriolaPeter JochumzsenBastian PoulsenThomas Schwanberger
Techn.& Eng.:Henrik BertelsenAksel BoiesenJimmy K. HansenJørn Westergaard
Funded By:-Danish Natural Science Research Council(FNU)-Danish Basic Research Foundation (GF)-Carlsberg Foundation
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Backup Slides
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TPC Momentum Resolution
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