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The near-side in STAR Christine Nattrass (Yale University) for the STAR Collaboration.

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Presentation on theme: "The near-side in STAR Christine Nattrass (Yale University) for the STAR Collaboration."— Presentation transcript:

1 The near-side in STAR Christine Nattrass (Yale University) for the STAR Collaboration

2 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 2 Outline ● Introduction ● The Jet – energy, system, and particle type dependence ● The Ridge – energy, system, and particle type dependence ● Comparison to models ● Conclusion

3 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 3 Introduction

4 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 4 Di-hadron correlations Parton Parton Hadrons Hadrons Λ  Λ  K 0 S, Ξ +, Ξ -... Trigger Associated = -ln(tan(/2))‏ = -ln(tan(/2))‏ ● Define a high-pT trigger particle ● Look at the distribution of particles relative to that trigger particle

5 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 5 Motivation – Jet and Ridge Long-range pseudorapidity ( Δη ) correlations observed by STAR in Au+Au at intermediate p T Near side jet peak sits on plateau (Ridge)‏ Significant contribution to the near-side yield in central Au+Au d+Au nucl-ex/0701074 Au+Au

6 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 6 Method: Yield extraction Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side, take ΔΦ  projections in -0.75< Δη <0.75 Jet + Ridge 0.75<| Δη |<1.75 Ridge Jet = (Jet+Ridge) – Ridge*.75/1.0 Ridge = yield from -1.75< Δη <1.75 – Jet yield Flow contributions to Jet cancel v 2 independent of η for |η|<1 Phys. Rev. C72, 051901(R) (2005), Phys. Rev. Lett. 94, 122303 (2005) ‏ Yield: number of particles in Jet, Ridge 3<p t,trigger <4 GeV p t,assoc. >2 GeV Ridge Jet+ Ridge Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/0701074 Jet+RidgeRidgeJet STAR preliminary

7 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 7 The Jet 3<p t,trigger <4 GeV p t,assoc. >2 GeV Au+Au 0-10% STAR preliminary Ridge Je t

8 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 8 Jet is like p+p ● Spectra of particles associated with Jet harder than inclusive inclusive Putschke WWND08 p T assoc > 2 GeV

9 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 9 ● Baryon/meson ratios in Jet in Cu+Cu and Au+Au similar to p+p for both strange and non-strange particles Suarez, QM08 M. Lamont (STAR), J.Phys.G32:S105-S114,2006 J. Bielcikova (STAR), v:0707.3100 [nucl-ex] C. Nattrass (STAR), arXiv:0804.4683/nucl-ex Jet composition 3<p T trigger <6 GeV/c 4 GeV/c <p T trigger

10 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 10 p T trigger dependence ● No system dependence observed in the data ● Pythia 8.1 describes trends in data up to a scaling factor – Gets energy dependence right – Stronger deviations at low p T trigger, as expected J. Bielcikova (STAR), arXiv:0806.2261/nucl-ex C. Nattrass (STAR), arXiv:0804.4683/nucl-ex 1.5 GeV/c<p T assoc <p T trigger

11 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 11 Pythia comparisons ● What can Pythia tell us? – Higher z T (lower jet energy) in 62 GeV for same p T trigger pTHat = the parameter in Pythia for the transverse momentum in the hard subprocess z T = p T trigger /pTHat 3.0 < p T trigger < 6.0 GeV/c 1.5 GeV/c<p T assoc <p T trigger

12 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 12 Pythia comparisons ● What can Pythia tell us? – Higher z T (lower jet energy) in 62 GeV for same p T trigger pTHat = the parameter in Pythia for the transverse momentum in the hard subprocess z T = p T trigger /pTHat 3.0 < p T trigger < 6.0 GeV/c 1.5 GeV/c<p T assoc <p T trigger

13 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 13 p T associated dependence ● No system dependence ● Pythia 8.1 slightly harder than data ● Diverges slightly from Pythia 8.1 at lower p T associated Inverse slope parameter Statistical errors only J. Bielcikova (STAR), arXiv:0806.2261/nucl-ex C. Nattrass (STAR), arXiv:0804.4683/nucl-ex 3.0 < p T trigger < 6.0 GeV/c

14 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 14 N part dependence *2/3 J. Bielcikova (STAR), arXiv:0806.2261/nucl-ex C. Nattrass (STAR), arXiv:0804.4683/nucl-ex ● No system dependence ● Some deviations from Pythia 8.1 with increase in N part – Incomplete Ridge subtraction? – Jet modification at low p T ? 3.0 < p T trigger < 6.0 GeV/c 1.5 GeV/c<p T assoc <p T trigger

15 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 15 Conclusions: Jet ● Particle ratios similar to p+p – Separation of Jet and Ridge works – Effects of triggers which don't come from jets small – Pythia can be used to estimate z T distributions, jet energy ● Pythia describes data well – Scaling factor needed but Pythia 8.1 is not as tuned as earlier versions – Energy dependence in Jet is described well in Pythia – Trends for p T trigger, p T assoc dependence right → → Jet production mechanism dominated by fragmentation

16 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 16 The Ridge 3<p t,trigger <4 GeV p t,assoc. >2 GeV Au+Au 0-10% STAR preliminary Jet Ridge

17 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 17 Ridge is like bulk ● Spectra of particles associated with Ridge similar to inclusive inclusive Putschke WWND08 p T assoc > 2 GeV

18 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 18 Ridge composition ● Baryon/meson ratios in Ridge similar to bulk for both strange and non-strange particles Suarez, QM08 M. Lamont (STAR), J.Phys.G32:S105-S114,2006 J. Bielcikova (STAR), v:0707.3100 [nucl-ex] C. Nattrass (STAR), arXiv:0804.4683/nucl-ex 3<p T trigger <6 GeV/c 4 GeV/c <p T trigger

19 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 19 Identified trigger: Near-side Yield vs N part Au+Au √ s NN =200 GeV from nucl-ex/0701047 Cu+Cu √ s NN =200 GeV from SQM2007 Data points at same N part offset for visibility Ridge yield - No trigger type dependence 3.0 GeV/c < p T trigger 6.0 GeV/c; 1.5 GeV/c < p T associated < p T trigger

20 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 20 Ridge yield vs. pt,trig in Au+Au ● Ridge yield persists to highest trigger pt ⇒ correlated with jet production p t,assoc. > 2 GeV STAR preliminary Putschke WWND08

21 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 21 Ridge vs N part ● No system dependence at given N part J. Bielcikova (STAR), arXiv:0806.2261/nucl-ex C. Nattrass (STAR), arXiv:0804.4683/nucl-ex 3.0 < p T trigger < 6.0 GeV/c 1.5 GeV/c<p T assoc <p T trigger

22 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 22 Ridge vs N part ● No system dependence at given N part ● Ridge/Jet Ratio independent of collision energy J. Bielcikova (STAR), arXiv:0806.2261/nucl-ex C. Nattrass (STAR), arXiv:0804.4683/nucl-ex 3.0 < p T trigger < 6.0 GeV/c 1.5 GeV/c<p T assoc <p T trigger

23 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 23 Jet/Ridge w.r.t. reaction plane in-plane S =0 out-of-plane S =90 o 3<p T trig <4, 1.5<p T assoc <2.0 GeV/c Ridge Je t In-plane Out-of-plane 1 4 3 2 5 6 Au+Au 200 20-60% Jet part, near-side Ridge part, near-side 20-60% Ridge yield decreases with S. Smaller ridge yield at larger S Jet yield approx. independent of S and comparable with d+Au Jet yield independent of S, consistent with vacuum fragmentation after energy loss and lost energy deposited in ridge, if medium is “black” out-of-plane and more “gray” in-plane for surviving jets. Ridge asymmetric in, consistent with surface emission Feng QM08 Konzer QM09 20-60% Au+Au 200 GeV

24 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 24 3-particle correlations ● Ridge appears uniform event-by-event within STAR acceptance ● Charge sign dependence: – All signs the same: no Jet, Ridge only – Friday Plenary session talk (Netrakanti) 1 2 1 = A1- T 2 = A2- T 3<p T trigger <10 1<p T assoc <3 ||<0.7 Radial flow + trigger bias S. Voloshin, nucl-th/0312065, Nucl. Phys. A749, 287 associated trigge r 12 13 Long. flow picture Armesto et al, PRL 93 (2004) associated trigge r 12 13 d+Au 0-12% d+Au 13 12 random 13 12 enhancement suppression asymmetry Netrakanti QM09 Outside STAR acceptance

25 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 25 Conclusions: Ridge ● Extensive data on Ridge – Cu+Cu, Au+Au consistent at same N part – Ridge/Jet ratio independent of energy – Persists to high p T trigger – Ridge looks like bulk ● p T associated dependence, particle composition – Appears isotropic in

26 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 26 Comparisons to models

27 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 27 arXiv:0711.1991v2arXiv:0711.1991v2Pr uneau et al Models ● Radial flow+trigger bias S. Voloshin, nucl-th/0312065, Nucl. Phys. A749, 287 C.. Pruneau, S. Gavin, S. Voloshin, arXiv:0711.1991v2 E. Shuryak, Phys.Rev.C76:047901,2007 – Works for one set of kinematic cuts in central Au+Au at 200 GeV – Need more detailed comparisons (energy dependence) – Model needs some refinements (momentum conservation) ● Plasma instability QCD magnetic fields, Majumder et al,Phys.Rev.Lett.99:042301,2007 Anisotropic plasma, P. Romatschke, PRC,75014901 (2007) – So far unable to make enough Ridge without Radial flow+trigger bias 20 arXiv:0805.279 5v2

28 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 28 Models ● Longitudinal flow Longitudinal flow, Armesto et al, PRL 93 (2004) – Problems due to Δη width ● Momentum kick Momentum kick from jet, C.-Y. Wong, Phys.Rev.C76:054908,2007 – Fits data well, including energy dependence ● Recombination Medium heating + recombination, Chiu & Hwa, PRC72, 034903 – No quantitative comparisons Armesto et al, PRL 93 (2004) C.Y. Wong Private communication 21

29 Christine Nattrass (STAR), RHIC/AGS User's Meeting, June 2, 2009 29 Conclusions ● Considerable evidence that Jet is dominantly produced by fragmentation – Can we use this information to learn more about the Ridge? ● Several models for the Ridge, few quantitative comparisons – Several depend on hydrodynamics – Need better calculations – more quantitative, more than central Au+Au ● Future: – More energy dependence (RHIC beam energy scan, LHC) – Jet reconstruction – more detailed studies of Ridge? – Ridge in -jet correlations?

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