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STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 1 1 Two particle azimuthal correlations in Cu+Cu collisions.

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Presentation on theme: "STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 1 1 Two particle azimuthal correlations in Cu+Cu collisions."— Presentation transcript:

1 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 1 1 Two particle azimuthal correlations in Cu+Cu collisions at  s NN = 200 GeV at RHIC Christine Nattrass (STAR collaboration) Yale University

2 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 2 2 Outline Motivation Analysis technique Results Conclusions

3 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 3 3 Motivation – Jets as a probe of the medium Hard parton scattering => back-to- back jets Good probes of medium produced at RHIC High multiplicity in A+A events Individual jets cannot be identified Jets have been studied using azimuthal correlations STAR, PRL 91 (2003) 072304

4 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 4 4 Motivation – particle identification in jets Particle identification: Particle/antiparticle differences Quark vs gluon jets Meson/baryon differences Coalescence/ recombination mechanisms Observed in particle ratios Testable with identified particle correlations? Parton Parton Hadrons Hadrons L,  L, K 0 S...?

5 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 5 5 Motivation - Long-range pseudorapidity correlations Long-range pseudorapidity (  ) correlations observed by STAR in Au+Au Near side jet peak sits on plateau (Ridge) Significant contribution to the near-side yield Look for particle, system size dependencies which might reveal production mechanism

6 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 6 6 Identification of strange particles V 0 identification Reconstruction decay vertices Identification out to high p T Pure samples V 0 s used for triggers VoVo K 0 S : m K0s =.498 GeV, c  = 2.68 cm K 0 S   + +  - (~69%) K 0 S   + +  - (~69%)   m  = 1.116 GeV, c  = 7.89 cm    - + p (~64%)   m   = 1.116 GeV, c  = 7.89 cm    + +  p (~64%)  STAR Preliminary  STAR Preliminary K0SK0SK0SK0S STAR Preliminary

7 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 7 7 Results Within errors, no significant difference between Meson and baryon Particle and antiparticle Cu+Cu @  s NN = 200 GeV 3.0 < p T trigger < 6.0 1.5 < p T assoc < p T trigger -1 <  < 1 reflected reflected reflectedreflected Central Peripheral particle/anti-particle baryon/meson

8 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 8 8 Background subtraction Background (combinatorial + flow) B(1+2v 2(trigger) v 2(assoc) cos(2  ) ) Sources of systematic error : Different methods: Fit Assume zero yield at minimum (ZYAM) Use one bin for minimum Use a few bins for minimum Error in v 2 Used v 2 {CuCu-pp} Systematic and random errors in v 2 v 2 larger in peripheral collisions 20-30% systematic error in near-side yields 0

9 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 9 9 Results – Near-side yields ZYAM (3 points) used No strong particle type dependence Systematic errors may be particle type dependent Yield rises with p T trigger

10 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 10 10 Results - Comparison to Au+Au Cu+Cu similar to Au+Au Yield increases with p T trigger No significant particle type dependence Significant ridge yield in Au+Au Investigations of Ridge vs Jet yield in Cu+Cu necessary

11 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 11 11 Results - Comparison to Au+Au Yields in Cu+Cu consistent with Au+Au at similar N part Cu+Cu can be used for studying jet and ridge yield at low N part STAR preliminary near-side Cu+Cu 0-10%

12 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 12 12 Conclusions Near-side yield trends similar to Au+Au Yield rises with p T trigger Yield is dependent on N part No significant difference between Meson /baryon triggers Particle /antiparticle triggers Ridge is a major contribution to near-side yield in Au+Au Ridge contribution in Cu+Cu needs to be investigated

13 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 13 13 Work to come...  -  correlations in Cu+Cu Jet vs Ridge yield comparisons V 0 associated particles (unidentified triggers) in Cu+Cu Study composition of ridge Multistrange trigger particles (  +,  -,  +,  - ) in Cu+Cu Test recombination model V 0 -V 0 correlations? See Jana Bielcikova and Jörn Putschke's talks at Quark Matter!

14 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 14 14 Backup slides

15 STAR Christine Nattrass (STAR Collaboration), Yale University DNP, Nashville, 28 October 2006 15 15

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