1. Hadron Spectra from Gábor I. Veres / MIT for the PHOBOS Collaboration

2. Collaboration Birger Back, Mark Baker, Maarten Ballintijn, Donald Barton, Russell Betts, Abigail Bickley, Richard Bindel, Wit Busza (Spokesperson), Alan Carroll, Zhengwei Chai, Patrick Decowski, Edmundo García, Tomasz Gburek, Nigel George, Kristjan Gulbrandsen, Stephen Gushue, Clive Halliwell, Joshua Hamblen, Adam Harrington, Conor Henderson, David Hofman, Richard Hollis, Roman Hołyński, Burt Holzman, Aneta Iordanova, Erik Johnson, Jay Kane, Nazim Khan, Piotr Kulinich, Chia Ming Kuo, Willis Lin, Steven Manly, Alice Mignerey, Gerrit van Nieuwenhuizen, Rachid Nouicer, Andrzej Olszewski, Robert Pak, Inkyu Park, Heinz Pernegger, Corey Reed, Michael Ricci, Christof Roland, Gunther Roland, Joe Sagerer, Iouri Sedykh, Wojtek Skulski, Chadd Smith, Peter Steinberg, George Stephans, Andrei Sukhanov, Marguerite Belt Tonjes, Adam Trzupek, Carla Vale, Siarhei Vaurynovich, Robin Verdier, Gábor Veres, Edward Wenger, Frank Wolfs, Barbara Wosiek, Krzysztof Woźniak, Alan Wuosmaa, Bolek Wysłouch, 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

3. PHOBOS Detector System New trigger system for d+Au PID spectra TOF SpecTrig See poster by C. Henderson and G.V.

4. p T (GeV/c) 0.05 0.5 5.0 Stopping particles dE/dx TOF Particle ID from low to high p T E loss (MeV) dE/dx Subm. to PRL nucl-ex/0401006 0.4 0.6 0.8 25 1.2 1.4 20 1510 50 0.2 0 1.0 PHOBOS PID Capabilities 1 23 4 50 p (GeV/c) 30 40 50 60 70 1/v (ps/cm)

5. Acceptance for PID Analyses dE/dx TOF  K p p T (GeV/c)

6. d+Au: =N coll /N part d Particle Ratios Using dE/dx PID Subm. to PRC nucl-ex/030913 See poster by A.A. Bickley PHOBOS 200 GeV

7. ...p/p Compared to Models 200 GeV PHOBOS Preliminary

8. Au+Au: =N coll /(N part /2) d+Au: =N coll /N part d Particle Ratios Using dE/dx PID Subm. to PRC nucl-ex/030913 See poster by A.A. Bickley PHOBOS 200 GeV

9. Particle/Antiparticle Ratios using the TOF d+Au T

10. Identified p T -spectra in d+Au Not feed-down corrected Scale uncertainty: 15%

11. Particle Composition in d+Au Not feed-down corrected

12. Identified m T -spectra in d+Au Scale uncertainty: 15% m T =m +p T 222 Not feed-down corrected

13. Identified m T -spectra at 200 GeV Subm. to PRL nucl-ex/0401006 d+Au Scale uncertainty: 15% Not feed-down corrected Au+Au Spectra normalized at 2 GeV/c 200 GeV 

14. Comparison: Low Energy d+Au Cronin, PRD 11, 3105, 1975 -0.1< <0.2 y y 0.2< <1.2 -0.5< <-0.2 y  lab =3.26 Not feed-down corrected

15. d+Au 200 GeV Centrality Dependence of p/h +, p/h -

16. Centrality dependence peripheral 40-70%central 0-20% d+Au 200 GeV Centrality Dependence of p/h +, p/h - medium 20-40%

17. Cronin Effect in d+Au vs. Centrality 6% most central Au+Au PRL 91, 072302 (2003) peripheral central

18. PRL 91, 072302 (2003)

19. Cronin Effect as a Function of  (d+Au)

21. Evolution of R dAu with  See poster by J.L. Kane

22. More coming soon... Summary ● Phobos has PID coverage from 0.05 to 3.5 GeV/c in p T First PID ratios and spectra from PHOBOS TOF Surprisingly small centrality dependence of p/p ratios Approximate m T scaling in d+Au as opposed to Au+Au Particle composition in d+Au: similar p T -dependence to lower energy data (but different overall proton fraction) ● Study of  -dependence Exciting new  - dependent R dAu values measured R dAu continuously decreases with 