highlights brahms. 14.11.06i.g. bearden, niels bohr institute qm'06 shanghai 2 outline brahms...
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![Page 1: HIGHLIGHTS BRAHMS. 14.11.06I.G. Bearden, Niels Bohr Institute QM'06 Shanghai 2 Outline BRAHMS Intermediate PT Soft physics](https://reader036.vdocuments.site/reader036/viewer/2022062518/5697bf991a28abf838c91583/html5/thumbnails/1.jpg)
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
HIGHLIGHTS
BRAHMS
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14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Outline
• BRAHMS
• Intermediate PT
• Soft physics
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14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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BRAHMS Collaboration
I. C. Arsene12, I. G. Bearden7, D. Beavis1, S. Bekele12, C. Besliu10, B. Budick6, H. Bøggild7, C. Chasman1, C. H. Christensen7, P. Christiansen7, H.Dahlsgaard7,
R. Debbe1, J. J. Gaardhøje7, K. Hagel8, H. Ito1, A. Jipa10, E.B.Johnson11, J. I. Jørdre9,
C. E. Jørgensen7, R. Karabowicz5, N. Katrynska5 ,E. J. Kim11, T. M. Larsen7, J. H. Lee1,
Y. K. Lee4,S. Lindahl12, G. Løvhøiden12, Z. Majka5, M. J. Murray11,J. Natowitz8, C.Nygaard7
B. S. Nielsen7, D. Ouerdane7, D.Pal12, F. Rami3, C. Ristea8, O. Ristea11, D. Röhrich9, B. H. Samset12, S. J. Sanders11, R. A. Scheetz1, P. Staszel5,
T. S. Tveter12, F. Videbæk1, R. Wada8, H. Yang9, Z. Yin9, I. S. Zgura2
1. Brookhaven National Laboratory, Upton, New York, USA2. Institute of Space Science, Bucharest - Magurele, Romania3. Institut Pluridisciplinaire Hubert Curien et Université Louis Pasteur, Strasbourg, France4. Johns Hopkins University, Baltimore, USA5. M. Smoluchkowski Institute of Physics, Jagiellonian University, Krakow, Poland6. New York University, New York, USA7. Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark8. Texas A&M University, College Station, Texas, USA9. University of Bergen, Department of Physics and Technology, Bergen, Norway10. University of Bucharest, Romania11. University of Kansas, Lawrence, Kansas, USA12. University of Oslo, Department of Physics, Oslo, Norway
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14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Broad RAnge Hadronic Magnetic SpectrometerS
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14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Acceptance for charged hadrons
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14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Pushing to forward y
• What changes? – dN/dy– pbar/p– Chemistry
– V2 (integral)
– Initial state? (d+Au)
• What doesn’t?– Suppression
(A+A)
– V2 (pt)
– B2
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Intermediate (2-6GeV)Pt
• h+,h- from eta=0 to 3.5
• Identified particles to yp≈3.1-3.5
(depending on system)• Au+Au (200GeV, 62GeV) Cu+Cu
(200,62), p+p (200, 62)
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14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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200 GeV Au+Au (Run IV)
10%
40-60%
p+p
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spectra as f(pseudo rapidity)
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Identified particle RAA, 200GeV Au+Au
y=0 y=1 y=3.1
pions
kaons
protons
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Identified particle RAA, 200GeV Au+Au
See Poster by Catalin Ristea
See Poster by Catalin Ristea
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Cu+Cu 62 GeV charged hadrons
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p+p 62GeV
Reference for RAA
Kinematic limit
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RAA 62 GeV midrapidity top, Cu+Cu; bottom Au+Au
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RAA Cu+Cu,Au+Au 62 GeV,
=3.1
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RAA Cu+Cu,Au+Au 62 GeV,
=3.1
See talk(||1.1) by Truls Larsen
See talk(||1.1) by Truls Larsen
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RdAu vs eta
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RdAu vs eta
See talk(||1.1) by Hongyan Yang
See talk(||1.1) by Hongyan Yang
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Other BRAHMS contributions
• J.H.Lee talk on suppression vs. xF
– Parallel session 1.1 Wednesday
• S. Bekele poster 200GeV Cu+Cu @ forward rapidity
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V2 Identified particles 200GeV Au+Au
=0 ≈3
K
p
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V2 Identified particles 200GeV Au+Au
See talk(||3.4) by Steve Sanders
See talk(||3.4) by Steve Sanders
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Coalescence: p+n d
• Characterize source via B2
• Assume B2≈V-1
• Details: • C. Nygaard • (||3.4 Sun.)
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What can we say about size vs. Rapidity?
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What can we say about size vs. Rapidity?
See talk(||3.4) by Casper N
ygaard
See talk(||3.4) by Casper N
ygaard
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Stopping: where are the baryons?
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Stopping 62 GeV Au+Au
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K/p vs. y 62 GeV Au+Au
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K/p vs. y 62 GeV Au+Au
See Poster by Ionut Arse
ne
See Poster by Ionut Arse
ne
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How about vs. pbar/p?
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Stopping: systematic
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LHC?
“net”
pro
ton
AGS
SPS
RHIC 62
RHIC 200
LHC 5500
dN
/dy
(BRAHMS preliminary)
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LHC?
“net”
pro
ton
AGS
SPS
RHIC 62
RHIC 200
LHC 5500
dN
/dy
(BRAHMS preliminary)“n
et”
pro
ton
AGS
SPS
RHIC 62
RHIC 200
LHC 5500
dN
/dy
(BRAHMS preliminary)
See Poster by Hans Dahlsgaard
See Poster by Hans Dahlsgaard
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Summary
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.• What changes? – dN/dy– pbar/p– Chemistry– V2 (integral)– Initial state? (d+Au)
• What doesn’t?– Suppression (A+A)
– V2 (pt)
– B2
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Backup Slides
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Inverse slope vs pbar/p
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36I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
14.11.06
⎟⎟⎠
⎞⎜⎜⎝
⎛−= 1
L
TOFcpm
2
2222
TIME-OF-FLIGHT
RICH: Cherenkov light focusedon spherical mirror ring on image plane
Ring radius vs momentum gives PID / K separation 20 GeV/cProton ID up to 35 GeV/c
CHERENKOV
(2 settings)
Particle Identification
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K
p
BRAHMS Acceptance: