HIGHLIGHTS BRAHMS. 14.11.06I.G. Bearden, Niels Bohr Institute QM'06 Shanghai 2 Outline BRAHMS...

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HIGHLIGHTS

BRAHMS

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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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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Broad RAnge Hadronic Magnetic SpectrometerS


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Acceptance for charged hadrons


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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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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

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:

HIGHLIGHTS BRAHMS. 14.11.06I.G. Bearden, Niels Bohr Institute QM'06 Shanghai 2 Outline BRAHMS...

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