Presentation is loading. Please wait.

Presentation is loading. Please wait.

Christof Roland/MITMoriond,March, 2001 -1- Results from the PHOBOS experiment at RHIC Christof Roland (MIT) for the PHOBOS Collaboration.

Published byAlexis Gaines Modified over 9 years ago

Similar presentations

Presentation on theme: "Christof Roland/MITMoriond,March, 2001 -1- Results from the PHOBOS experiment at RHIC Christof Roland (MIT) for the PHOBOS Collaboration."— Presentation transcript:

1

2 Christof Roland/MITMoriond,March, 2001 -1- Results from the PHOBOS experiment at RHIC Christof Roland (MIT) for the PHOBOS Collaboration

3 Christof Roland/MITMoriond,March, 2001 -2- Year 1: The Big Picture Q: Entropy Production Hadro-Chemistry Thermal Equilibration  Multiplicity  Charged Particle Density  Event Anisotropy  Flow  Particle Ratios Au+Au Collisions @  s = 130 GeV

4 Christof Roland/MITMoriond,March, 2001 -3- PHOBOS Collaboration ARGONNE NATIONAL LABORATORY BROOKHAVEN NATIONAL LABORATORY INSTITUTE OF NUCLEAR PHYSICS, KRAKOW MASSACHUSETTS INSTITUTE OF TECHNOLOGY NATIONAL CENTRAL UNIVERSITY, TAIWAN UNIVERSITY OF ROCHESTER UNIVERSITY OF ILLINOIS AT CHICAGO UNIVERSITY OF MARYLAND Birger Back, Nigel George, Alan Wuosmaa Mark Baker, Donald Barton, Alan Carroll, Stephen Gushue, George Heintzelman, Robert Pak, Louis Remsberg, Peter Steinberg, Andrei Sukhanov Andrzej Budzanowski, Roman Holynski, Jerzy Michalowski, Andrzej Olszewski, Pawel Sawicki, Marek Stodulski, Adam Trzupek, Barbara Wosiek, Krzysztof Wozniak Wit Busza (Spokesperson), Patrick Decowski, Kristjan Gulbrandsen, Conor Henderson, Jay Kane, Judith Katzy, Piotr Kulinich, Johannes Muelmenstaedt, Heinz Pernegger, Corey Reed, Christof Roland, Gunther Roland, Leslie Rosenberg, Pradeep Sarin, Stephen Steadman, George Stephans, Gerrit van Nieuwenhuizen, Carla Vale, Robin Verdier, Bernard Wadsworth, Bolek Wyslouch Willis Lin, Jaw-Luen Tang Joshua Hamblen, Erik Johnson, Nazim Khan, Steven Manly, Inkyu Park, Wojtek Skulski, Ray Teng, Frank Wolfs Russell Betts, Clive Halliwell, David Hofman, Burt Holzman, Wojtek Kucewicz, Don McLeod, Rachid Nouicer, Michael Reuter Richard Bindel, Edmundo Garcia, Alice Mignerey

5 Christof Roland/MITMoriond,March, 2001 -4- PHOBOS Detector Ring Counters Paddle Trigger Counter Spectrometer TOF Octagon+Vertex 96000 Silicon Pad channels 4  Multiplicity Array Mid-rapidity Spectrometer Scintillator Paddles + Zero Degree Calorimeter for triggering TOF wall for high-momentum PID

6 Christof Roland/MITMoriond,March, 2001 -5- First RHIC physics result: Back et al., PRL 85 (2000) 3100 Multiplicity at  =0 vs Energy RESULT  sNpart 56 GeV330 +/- 4 + 10 /- 15 130 GeV343 +/- 4 + 7 /- 14  sdN/d  56 GeV408 +/- 12 +/- 30 130 GeV555 +/- 12 +/- 35  s2dN/d  /N part 56 GeV2.47 +/-.10 +/-.25 130 GeV3.24 +/-.10 +/-.25 Ratio: 1.31 +/-.04 +/-.05 Au+Au @ 130 GeV: 40% increase from p+p to central Au+Au 70% increase from CERN-SPS 6% most central

7 Christof Roland/MITMoriond,March, 2001 -6- Multiplicity at  =0 vs N part N part Yellow band: Systematic uncertainty Preliminary dN ch /d  /(0.5*N part ) Physics run July-Sept 2000 10 centrality bins for upper 45% of cross section Q: How does dNch/d  @  =0 evolve from 2.3 (p+p) to 3.25 (Au+Au) per participant pair? EKRT Saturation disfavored Good agreement with previous PHOBOS point Neither HIJING nor EKRT describe data well

8 Christof Roland/MITMoriond,March, 2001 -7-  Multiplicity in 4  (Hit counting) Occupancy correction (assuming Poisson statistics) dN ch dd =  hits O( ,b) ×f B ( ,b) A(Z VTX )   RingsOctagonRings Acceptance Factor Background correction

9 Christof Roland/MITMoriond,March, 2001 -8- dN ch /d  vs Centrality Preliminary Statistical errors only - 10-20% systematical uncertainty

10 Christof Roland/MITMoriond,March, 2001 -9- Evolution of dNch/d  vs Npart = 4100 +/- 410 for 3% most central Additional particle production near  =0 Wider + more particles relative to HIJING Preliminary  (dN ch /d  )/(½N part ) Data HIJING N part =356 N part =215 N part =103 (dN ch /d  )/(½N part ) Statistical errors only  N part PHOBOS Prelim. ±10% Systematic Uncertainty HIJING N ch (|  |<5.4)

11 Christof Roland/MITMoriond,March, 2001 -10- Collective Effects: Elliptic Flow Q: Does the initial space anisotropy translate into final state momentum space anisotropy? b (reaction plane) dN/d(  R ) = N 0 (1 + 2V 1 cos (  R ) + 2V 2 cos (2(  R ) ) +... )

12 Christof Roland/MITMoriond,March, 2001 -11- Systematic error ~ 0.007 Large V 2 signal compared to lower energy Centrality Dependence close to Hydro. V 2 drops for |  | > 1.5 Elliptic Flow Results  V2V2 PHOBOS STAR (PRL) Hydro. model V2V2 Normalized Paddle Signal SPS AGS Preliminary |  | < 1.0 Averaged over centrality

13 Christof Roland/MITMoriond,March, 2001 -12- Hadro Chemistry: Particle Ratios p-p- Preliminary  Thermal Model Estimte :  B ~ 50 MeV  Central region not net baryon-free! Q: Baryo-Chemical Potential, Baryon Stopping.)syst(..)stat(...)syst(..)stat(.. p p K K 10050540 10090910  .)syst(..)stat(.. 050010 1        Centrality =12 % ~ 310

14 Christof Roland/MITMoriond,March, 2001 -13- dN ch /d  @  =0 per participant 70% higher than SPS for central Au+Au 40% higher than p+p at RHIC energy N part evolution between HIJING and EKRT dN ch /d  in 4-  = 4100 +/- 410 (|  |< 5.4) for 3% central Additional particle production near  =0 for central events Wider than HIJING Elliptic flow V 2 up to 0.06 – close to hydrodynamic limit larger than SPS V 2 drops for |  | > 1.5 Particle ratios p/p ratio 0.54 +/- 0.1 Central region not baryon free Summary

15 Christof Roland/MITMoriond,March, 2001 -14- Outlook I: 2001 >100x statistics Physics: low-p T physics Spectra HBT Resonances (  at low p T  Event-by-Event physics Both arms completed Energy systematics Species systematics

Download ppt "Christof Roland/MITMoriond,March, 2001 -1- Results from the PHOBOS experiment at RHIC Christof Roland (MIT) for the PHOBOS Collaboration."

Similar presentations

ICHEP 2002, AmsterdamGerrit van Nieuwenhuizen/MIT Scaling of Charged Hadron p T distributions in Au+Au collisions at 200 GeV Gerrit van Nieuwenhuizen MIT.

ICHEP 2002, AmsterdamGerrit van Nieuwenhuizen/MIT Scaling of Charged Hadron p T distributions in Au+Au collisions at 200 GeV Gerrit van Nieuwenhuizen MIT.
Tokaj, Hungary, March 17, 2008Gábor VeresHigh-p T physics at the LHC, Tokaj ’08 1 Correlations with a high-p T trigger over a broad η range Gábor Veres.

Tokaj, Hungary, March 17, 2008Gábor VeresHigh-p T physics at the LHC, Tokaj ’08 1 Correlations with a high-p T trigger over a broad η range Gábor Veres.
Peter Steinberg PHOBOS The Landscape of Particle Production: Results from. Peter Steinberg Brookhaven National Laboratory SPS FNALRHICSppS AGS.

Peter Steinberg PHOBOS The Landscape of Particle Production: Results from. Peter Steinberg Brookhaven National Laboratory SPS FNALRHICSppS AGS.
Gunther Roland - MITPHOBOS ISMD’05 3 Remarks on Fluctuations in Hadron Production at RHIC Gunther Roland Massachusetts Institute of Technology New Results.

Gunther Roland - MITPHOBOS ISMD’05 3 Remarks on Fluctuations in Hadron Production at RHIC Gunther Roland Massachusetts Institute of Technology New Results.
Systematics of Soft Particle Production at RHIC: George S.F. Stephans Massachusetts Institute of Technology Lessons from (And some thoughts for the future)

Systematics of Soft Particle Production at RHIC: George S.F. Stephans Massachusetts Institute of Technology Lessons from (And some thoughts for the future)
S. Manly – U. Rochester Quark Matter, Budapest, Hungary - August 20051 System size, energy and  dependence of directed and elliptic flow Steven Manly.

S. Manly – U. Rochester Quark Matter, Budapest, Hungary - August System size, energy and  dependence of directed and elliptic flow Steven Manly.
Rachid Nouicer1 The Latest Results from RHIC Rachid NOUICER University of Illinois at Chicago and Brookhaven National Laboratory for the Collaboration.

Rachid Nouicer1 The Latest Results from RHIC Rachid NOUICER University of Illinois at Chicago and Brookhaven National Laboratory for the Collaboration.
S. Manly – U. Rochester Gordon Conf. 2006, New London, New Hampshire1 The simple geometric scaling of flow – perhaps it’s not so simple after all Steven.

S. Manly – U. Rochester Gordon Conf. 2006, New London, New Hampshire1 The simple geometric scaling of flow – perhaps it’s not so simple after all Steven.
June 5, 2002REU Seminar, University of Rochester1 Searching for a new form of matter on Long Island Steve Manly, University of Rochester 12 June, 2000:

June 5, 2002REU Seminar, University of Rochester1 Searching for a new form of matter on Long Island Steve Manly, University of Rochester 12 June, 2000:
S. Manly – U. Rochester Xi’an, China, Nov. 23, 20061 The eccentricities of flow S. Manly University of Rochester International Workshop on Hadron Physics.

S. Manly – U. Rochester Xi’an, China, Nov. 23, The eccentricities of flow S. Manly University of Rochester International Workshop on Hadron Physics.
Conor Henderson, MIT APS April 2001 Measurement Of Charged Antiparticle To Particle Ratios by the PHOBOS Experiment at RHIC Conor Henderson Massachusetts.

Conor Henderson, MIT APS April 2001 Measurement Of Charged Antiparticle To Particle Ratios by the PHOBOS Experiment at RHIC Conor Henderson Massachusetts.
Charged particle multiplicity studies with PHOBOS Birger Back Argonne National Laboratory for the PHOBOS Collaboration.

Charged particle multiplicity studies with PHOBOS Birger Back Argonne National Laboratory for the PHOBOS Collaboration.
Results from PHOBOS at RHIC David Hofman University of Illinois at Chicago For the Collaboration European Physical Society HEP2005 International Europhysics.

Results from PHOBOS at RHIC David Hofman University of Illinois at Chicago For the Collaboration European Physical Society HEP2005 International Europhysics.
Measurement of the Centrality Dependence of Charged Particle Pseudorapidity Density with the PHOBOS Detector Michael Reuter University of Illinois at Chicago.

Measurement of the Centrality Dependence of Charged Particle Pseudorapidity Density with the PHOBOS Detector Michael Reuter University of Illinois at Chicago.
Multiplicity Fluctuations in 200 GeV Au-Au Collisions Zhengwei Chai Brookhaven National Laboratory for the Collaboration APS April Meeting, Denver, 2004.

Multiplicity Fluctuations in 200 GeV Au-Au Collisions Zhengwei Chai Brookhaven National Laboratory for the Collaboration APS April Meeting, Denver, 2004.
1 - S. Manly, Univ. of Rochester APS - Washington D.C. - April 2001 Results from the PHOBOS experiment at RHIC Steve Manly (Univ. of Rochester) for the.

1 - S. Manly, Univ. of Rochester APS - Washington D.C. - April 2001 Results from the PHOBOS experiment at RHIC Steve Manly (Univ. of Rochester) for the.
Gábor I. VeresQuark Matter 2006, Shanghai, November 14-20, 2006 1 Anti-particle to particle ratios in p+p, Cu+Cu and Au+Au collisions at RHIC Gábor I.

Gábor I. VeresQuark Matter 2006, Shanghai, November 14-20, Anti-particle to particle ratios in p+p, Cu+Cu and Au+Au collisions at RHIC Gábor I.
Update on flow studies with PHOBOS S. Manly University of Rochester Representing the PHOBOS collaboration Flow Workshop BNL, November 2003.

Update on flow studies with PHOBOS S. Manly University of Rochester Representing the PHOBOS collaboration Flow Workshop BNL, November 2003.
Heinz Pernegger for First performance results from Phobos at RHIC Heinz Pernegger for the PHOBOS collaboration Vertex 2000.

Heinz Pernegger for First performance results from Phobos at RHIC Heinz Pernegger for the PHOBOS collaboration Vertex 2000.
Femtoscopy BNL Workshop 6/21/2005George Stephans Very Low p T in x Past, Present, and Prospects.

Femtoscopy BNL Workshop 6/21/2005George Stephans Very Low p T in x Past, Present, and Prospects.

Similar presentations

Ads by Google