Relativistic Heavy Ions Experiment II Global Observables.
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Relativistic Heavy Ions Experiment II Global Observables
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Transcript of Relativistic Heavy Ions Experiment II Global Observables.
Relativistic Heavy Ions
Experiment II
Global Observables
Participant – Spectator Scenario
NA49 Trigger Setup
NA49 Target Area
NA49 Ring Calorimeter
NA49 Veto Calorimeter
Hadronic Calorimeter
Distributions of Nch and ET
Correlation EF and ET
Centrality Classes
Centrality Selection via Multplicity: WA97 / NA57
Centrality Selection via Multplicity: WA97 / NA57
Beam-Beam
Counter atRHIC
Beam-Beam Counter at RHIC
Zero Degree Calorimeter (ZDC) at RHIC
Centrality Selection at RHIC
ET Distribution
Energy Density (Bjørken)
Wounded Nucleon Scaling
Participant Scaling
Energy Density
Stopping
yP yT
y0
y y
y0
yP yT
y y y’Ty’p
Baryonnumber distributionsLower energies: Higher energies:
Stopping
NA49
Observable: net-proton distributions
Stopping
Energy Dependence of y
py BB
partp
p
dydy
dNy
Ny
yyy
0
)(2
Linear increase up to SPS: y /ybeam 0.27
Rapidity shift:
dyydy
dNmE BBy
y yT
p
p
cosh)(
Energy loss E :
RHIC (sNN = 200 GeV):E = 25.7 ± 2.1 TeV E/Nucleon = 72± 6 GeV
Rapidity-Distributions of Baryons
Central Pb+Pb, 158 AGeV
Net-protons: 3 Valence Quarks (uud )
Omegas: 3 produced Quarks (sss )
Net s:1 Valence (d ) + 2 produced Quarks (ss )
Net s:2 Valence (ud ) +1 produced Quark (s )
NA49
dn
/dy (
a.u
.)
y
