Centrality dependence of charged hadron production at rhic d au vs au au
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Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au. Gunther Roland/MIT for the PHOBOS Collaboration. BNL June 18, 2003. Collaboration. Birger Back, Mark Baker, Maarten Ballintijn, Donald Barton, Bruce Becker, Russell Betts,

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Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au

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Centrality dependence of charged hadron production at rhic d au vs au au

Centrality Dependence of Charged Hadron Production at RHICd+Au vs Au+Au

Gunther Roland/MIT

for the

PHOBOS Collaboration

BNL June 18, 2003


Collaboration

Collaboration

Birger Back,Mark Baker, Maarten Ballintijn, Donald Barton, Bruce Becker, Russell Betts,

Abigail Bickley, Richard Bindel, Andrzej Budzanowski, Wit Busza (Spokesperson), Alan Carroll,

Patrick Decowski, Edmundo Garcia, Tomasz Gburek, Nigel George, Kristjan Gulbrandsen,

Stephen Gushue, Clive Halliwell, Joshua Hamblen,Adam Harrington,Conor Henderson,

David Hofman, Richard Hollis, Roman Holynski, Burt Holzman, Aneta Iordanova,Erik Johnson,

Jay Kane, Nazim Khan, Piotr Kulinich, Chia Ming Kuo,Jang Woo Lee, Willis Lin, Steven Manly,

Alice Mignerey, Gerrit van Nieuwenhuizen, Aaron Noell, Rachid Nouicer, Andrzej Olszewski,

Robert Pak, Inkyu Park, Heinz Pernegger, Corey Reed, Louis Remsberg, Christof Roland,

Gunther Roland, Joe Sagerer, Pradeep Sarin, Pawel Sawicki, Iouri Sedykh, Wojtek Skulski,

Chadd Smith, Peter Steinberg, George Stephans, Andrei Sukhanov, Ray Teng,

Marguerite Belt Tonjes, Adam Trzupek, Carla Vale, Robin Verdier, Gábor Veres, Bernard Wadsworth, Frank Wolfs, Barbara Wosiek, Krzysztof Wozniak, Alan Wuosmaa, Bolek Wyslouch, Jinlong Zhang

ARGONNE NATIONAL LABORATORYBROOKHAVEN NATIONAL LABORATORY

INSTITUTE OF NUCLEAR PHYSICS, KRAKOWMASSACHUSETTS INSTITUTE OF TECHNOLOGY

NATIONAL CENTRAL UNIVERSITY, TAIWANUNIVERSITY OF ILLINOIS AT CHICAGO

UNIVERSITY OF MARYLANDUNIVERSITY OF ROCHESTER


Centrality dependence of charged hadron production at rhic d au vs au au

PHOBOS preliminary

Au+Au 200 GeV

15% central

?

How to connect observed

final state particles to

theory of strong interaction?


Particle multiplicity at rhic

Particle Multiplicity at RHIC

600

1200

Compilation by K. Eskola

Rapidity Density


Particle multiplicity at rhic1

Multiplicity at low end of range

But: Energy density 30x nuclear matter

Most models didn’t do so well

PHOBOS Central Au+Au (200 GeV)

600

1200

Compilation by K. Eskola

Rapidity Density

Particle Multiplicity at RHIC

PHOBOS multiplicity papers:

Phys. Rev. Lett. 85 , 3100 (2000)

Phys. Rev. Lett. 87, 102303 (2001)

Phys. Rev. C 65 , 31901R (2002)

Phys.Rev. Lett. 88 , 22302 (2002)

Phys. Rev. C 65 , 061901R (2002)

nucl-ex/0210015, PRL in Press

nucl-ex/0301017, subm. to PRL


Particle multiplicity at rhic2

Parton Saturation

PHOBOS Central Au+Au (200 GeV)

600

1200

Compilation by K. Eskola

Rapidity Density

Particle Multiplicity at RHIC

Low Energy

High Energy

Color Glass


Particle multiplicity at rhic3

PHOBOS Central Au+Au (200 GeV)

600

1200

Compilation by K. Eskola

Rapidity Density

Particle Multiplicity at RHIC

Hadron multiplicities at RHIC well

described by Parton Saturation

Kharzeev & Levin, Phys. Lett. B523 (2001) 79

Color Glass

Data: PHOBOS,

Phys. Rev. Lett. 87, 102303 (2001)


P t spectra for au au @ 200 gev

Relative to UA1 p+p

0.2<yp<1.4

Data: PHOBOS, nucl-ex/0302015

Submitted to Phys Lett B

pT Spectra for Au+Au @ 200 GeV


Centrality dependence vs p t

Initial State

Coherence?

Interaction in

Dense Medium?

Centrality Dependence vs pT

PHOBOS, nucl-ex/0302015

Similar centrality dependence at

pT = 0.5 and 4 GeV/c !


Predictions for d au

Predictions for d+Au

pQCD

Parton Saturation

Vitev, nucl-th/0302002, Phys.Lett.B in press

Vitev and M.Gyulassy, Phys.Rev.Lett. 89 (2002)

Kharzeev, Levin, McLerran, hep-ph/021332

“~30%suppression of high pT particles”

(central vs peripheral)

Nuclear Modification Factor RdAu

Central

Peripheral

16% increase central vs peripheral


Centrality dependence of charged hadron production at rhic d au vs au au

PHOBOS Detector 2003

T0

T0

mini-pCal

SPECTRIG

  • Moved TOF walls back

    • 5 m from interaction point

  • New on-line high pT Spectrometer Trigger

  • New “time-zero” (T0) Cerenkov detectors

    • On-line vertexing and ToF start time

  • Forward proton calorimeters on Gold and Deuteron sides

  • DAQ upgrade (x10)

pCal


Centrality determination in d au

Centrality Determination in d+Au

HIJING Simulation

dN/dh

Counts

Multiplicity distribution

Pseudorapidity

  • Glauber Calculation

  • Hijing 1.383

    • Hulthen w.f.

    • 41mb inelastic cross-section

  • Full GEANT Simulation


D au p t spectra

Compare to p+p reference…

41mb (same as for Glauber)

From Glauber

(HIJING 1.383)

From UA1, using

Pythia to go from

|h| < 2.5 to 0.2 < h < 1.4

…for each centrality bin

d+Au pT Spectra

PHOBOS d+Au: nucl-ex/0306025


R dau vs p t

RdAu vs pT

PHOBOS d+Au: nucl-ex/0306025

central Au+Au

All syst. uncertainties: 90% C.L.


Centrality dependence of r dau

Centrality dependence of RdAu

PHOBOS d+Au: nucl-ex/0306025

Data disfavor initial state

interpretation of Au+Au

high-pT suppression

N.B. Smaller sppinel would increase

RdAu central vs RdAu peripheral

All syst. uncertainties: 90% C.L.


Connection to qcd

Connection to QCD

Initial State

‘Final State’ Interactions

Interaction of fast partons

with dense medium has

been observed

Quantitative diagnostic

tool now established

Multiplicity systematics

connected to initial state

Consistent with parton

saturation picture


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