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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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relativistic heavy ions alice cern

Relativistic Heavy IonsALICE/CERN

KristjanGulbrandsen

Niels Bohr Institute - Discovery

qcd phase diagram
QCD Phase Diagram

NUPECC Meeting - June 15 2012

cern the large hadron collider
CERN – The Large Hadron Collider

NUPECC Meeting - June 15 2012

creating the early universe
Creating the Early Universe

NUPECC Meeting - June 15 2012

nucleus collisions
Nucleus Collisions

NUPECC Meeting - June 15 2012

detecting a collision
Detecting a Collision

NUPECC Meeting - June 15 2012

a large ion collider experiment
A Large Ion Collider Experiment

NUPECC Meeting - June 15 2012

time projection chamber tpc
Time Projection Chamber (TPC)
  • Measure position and momentum
  • Particle Identification

NUPECC Meeting - June 15 2012

tpc laser
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

tpc pbpb event
TPC PbPb Event

NUPECC Meeting - June 15 2012

strong hydrodynamics
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

forward multiplicity detector
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

dn d h versus h
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

long range correlations lrc
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

proton collision processes
Proton Collision Processes

NUPECC Meeting - June 15 2012

summary
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

future
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

hehi group in 2012
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

backup slides
Backup Slides

NUPECC Meeting - June 15 2012

tpc momentum resolution
TPC Momentum Resolution

NUPECC Meeting - June 15 2012