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Recent Results from PHOBOS at RHIC

ARGONNE NATIONAL LABORATORYBirger Back, Alan WuosmaaBROOKHAVEN NATIONAL LABORATORYMark Baker, Donald Barton, Alan Carroll, Nigel George, Stephen Gushue, George Heintzelman, Burt Holzman, Robert Pak, Louis Remsberg, Peter Steinberg, Andrei SukhanovINSTITUTE OF NUCLEAR PHYSICS, KRAKOWAndrzej Budzanowski, Roman Holynski, Jerzy Michalowski, Andrzej Olszewski, Pawel Sawicki, Marek Stodulski, Adam Trzupek, Barbara Wosiek, Krzysztof WozniakMASSACHUSETTS INSTITUTE OF TECHNOLOGYMaa24

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Recent Results from PHOBOS at RHIC

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    1. Recent Results from PHOBOS at RHIC Robert Pak Brookhaven National Laboratory for the PHOBOS Collaboration PANIC 2002 Osaka, Japan Sept. 30th, 2002

    3. PHOBOS Apparatus

    4. Kinematics: many ways to slice pz

    6. Particle Spectra

    7. Why charged particle production? Fundamental handle on the initial state Upper bound on initial entropy density Entropy does NOT require equilibrium Initial gluon density Constrains subsequent evolution Freezeout entropy density

    8. Pseudorapidity Density Distributions Au+Au collisions at ?s = 19.6, 130, 200 GeV dN/dh for |h| < 5.4 over full azimuth Top 50% of total cross section (Npart~ 65 - 360) Data at 56 GeV only for central density at |h| < 1

    10. Centrality Dependence of Central Density

    11. Limiting Fragmentation

    12. Centrality Dependence of ?Nch?

    13. Remove the Leading Proton Effect

    14. Comparison of Nch vs. Energy

    15. Total Multiplicity vs. Beam Energy

    16. Azimuthal Angular Distributions

    17. 130 GeV errors not shown Similar to 130 GeV results Within errors, difficult to distinguish whether or not v2 is saturated or scales with the increase in multiplicity as the energy increases.130 GeV errors not shown Similar to 130 GeV results Within errors, difficult to distinguish whether or not v2 is saturated or scales with the increase in multiplicity as the energy increases.

    18. Here we integrate over h+ and h-Here we integrate over h+ and h-

    19. Again, little changed from 130 GeVAgain, little changed from 130 GeV

    20. Again, little changed from 130 GeVAgain, little changed from 130 GeV

    21. Not boost invariant over broad h range Limiting fragmentation confirmed for AA Total yields in AA scale primarily with Npart Surprising similarity between AA and e+e- Conclusions

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