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System size and energy dependence of

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1 System size and energy dependence of
high-pT triggered correlations in STAR Christine Nattrass (Yale) for the STAR Collaboration

2 Outline Introduction The Jet The Ridge Theory Conclusions 2 Jet Ridge
3<pt,trigger<4 GeV pt,assoc.>2 GeV Au+Au 0-10% STAR preliminary Ridge Jet 2

3 Motivation – Jet and Ridge
d+Au √sNN = 200 GeV In d+Au narrow peak narrow in ΔΦ, Δη even for small pTtrigger Long-range pseudorapidity (Δη) correlations observed by STAR in Au+Au at intermediate pT Significant contribution to the near-side yield in central Au+Au at intermediate pTassoc,pTtrigger Yield/trigger – number of particles in pTassoc range associated with trigger particle with pTtrigger range nucl-ex/ Au+Au √sNN = 200 GeV 3 3

4 Extent of Ridge in  Jet Ridge Putschke WWND08 STAR Preliminary pTassoc > 2 GeV Ridge yield approximately independent of  in STAR acceptance PHOBOS (arXiv: v3) showed independence on  out to  = 4 Jet increases with pTtrigger, Ridge roughly constant 4

5 Method: Yield extraction
Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side (-1<ΔΦ<1), take ΔΦprojections in 3<pt,trigger<4 GeV pt,assoc.>2 GeV Ridge Jet+ Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/ 5 5

6 Method: Yield extraction
Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side (-1<ΔΦ<1), take ΔΦprojections in -0.75<Δη<0.75 Jet + Ridge 3<pt,trigger<4 GeV pt,assoc.>2 GeV Ridge Jet+ Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/ Jet+Ridge 5 STAR preliminary 6

7 Method: Yield extraction
Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side (-1<ΔΦ<1), take ΔΦprojections in -0.75<Δη<0.75 Jet + Ridge 0.75<|Δη|<1.75 Ridge 3<pt,trigger<4 GeV pt,assoc.>2 GeV Ridge Jet+ Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/ Ridge Jet+Ridge 5 STAR preliminary 7

8 Method: Yield extraction
Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side (-1<ΔΦ<1), take ΔΦprojections in -0.75<Δη<0.75 Jet + Ridge 0.75<|Δη|<1.75 Ridge Jet = (Jet+Ridge) – Ridge*.75/1.0 3<pt,trigger<4 GeV pt,assoc.>2 GeV Ridge Jet+ Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/ Jet Ridge Jet+Ridge 5 STAR preliminary 8

9 Method: Yield extraction
Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side (-1<ΔΦ<1), 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 <Δη<1.75 – Jet yield 3<pt,trigger<4 GeV pt,assoc.>2 GeV Ridge Jet+ Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/ 5 9

10 Method: Yield extraction
Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side (-1<ΔΦ<1), 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 <Δη<1.75 – Jet yield Flow contributions to Jet cancel v2 independent of η for |η|<1 Phys. Rev. C72, (R) (2005), Phys. Rev. Lett. 94, (2005)‏ 3<pt,trigger<4 GeV pt,assoc.>2 GeV Ridge Jet+ Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/ 5 10

11 Method: Yield extraction
Ridge previously observed to be independent in Δη in Au+Au To determine relative contributions, find yields for near-side (-1<ΔΦ<1), 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 <Δη<1.75 – Jet yield Flow contributions to Jet cancel v2 independent of η for |η|<1 Phys. Rev. C72, (R) (2005), Phys. Rev. Lett. 94, (2005)‏ 3.0<pTtrigger<6.0 GeV/c; pTassoc>1.5 GeV/c unless otherwise stated 3<pt,trigger<4 GeV pt,assoc.>2 GeV Ridge Jet+ Ridge Au+Au 0-10% STAR preliminary h+h nucl-ex/ 5 11

12 The Jet 6 Jet Ridge Au+Au 0-10% STAR preliminary
3<pt,trigger<4 GeV pt,assoc.>2 GeV Au+Au 0-10% STAR preliminary Ridge Jet 6

13 pTtrigger dependence Pythia 8.1 describes trends in data up to a scaling factor Gets energy dependence right → this is a pQCD effect Stronger deviations at low pTtrigger, as expected J. Bielcikova (STAR), arXiv: /nucl-ex C. Nattrass (STAR), arXiv: /nucl-ex 7

14 Pythia comparisons What can Pythia tell us?
zT = pTtrigger/pTHat What can Pythia tell us? Higher zT (lower jet energy) in 62 GeV for same pTtrigger pTHatMin = the parameter in Pythia for the minimum transverse momentum in the hard subprocess 8

15 Pythia comparisons What can Pythia tell us?
zT = pTtrigger/pTHat What can Pythia tell us? Higher zT (lower jet energy) in 62 GeV for same pTtrigger pTHatMin = the parameter in Pythia for the minimum transverse momentum in the hard subprocess 8

16 pTassociated dependence
No system dependence Pythia 8.1 slightly harder than data Diverges slightly from Pythia 8.1 at lower pTassociated Inverse slope parameter Statistical errors only J. Bielcikova (STAR), arXiv: /nucl-ex C. Nattrass (STAR), arXiv: /nucl-ex 9

17 Npart dependence No system dependence
*2/3 No system dependence Some deviations from Pythia 8.1 with increase in Npart Incomplete Ridge subtraction? Jet modification at low pT? J. Bielcikova (STAR), arXiv: /nucl-ex C. Nattrass (STAR), arXiv: /nucl-ex 10

18 Jet composition Suarez, QM08 M. Lamont (STAR), J.Phys.G32:S105-S114,2006 J. Bielcikova (STAR), v: [nucl-ex] C. Nattrass (STAR), arXiv: /nucl-ex Baryon/meson ratios in Jet in Cu+Cu and Au+Au similar to p+p for both strange and non-strange particles 11

19 Conclusions: Jet Pythia describes data well
Scaling factor needed but Pythia 8.1 is not as tuned as earlier versions Energy dependence in Jet is pQCD effect Trends for pTtrigger, pTassoc dependence right Particle ratios similar to p+p → Jet production mechanism dominated by fragmentation Separation of Jet and Ridge works 12

20 The Ridge 13 Jet Ridge Au+Au 0-10% STAR preliminary
3<pt,trigger<4 GeV pt,assoc.>2 GeV Au+Au 0-10% STAR preliminary Jet Ridge 13

21 Ridge vs Npart No system dependence at given Npart 14
J. Bielcikova (STAR), arXiv: /nucl-ex C. Nattrass (STAR), arXiv: /nucl-ex 14

22 Ridge vs Npart No system dependence at given Npart
Ridge/Jet Ratio independent of collision energy J. Bielcikova (STAR), arXiv: /nucl-ex C. Nattrass (STAR), arXiv: /nucl-ex 14

23 Ridge yield vs. pTtrigger in Au+Au
STAR preliminary pTassociated > 2 GeV Putschke WWND08 Ridge yield persists to high pTtrigger 15

24 Ridge yield vs. pTassociated in Au+Au
inclusive STAR Preliminary pTassociated > 2 GeV Putschke WWND08 Spectra of particles associated with Ridge similar to inclusive 16

25 Ridge composition Suarez, QM08 M. Lamont (STAR), J.Phys.G32:S105-S114,2006 J. Bielcikova (STAR), v: [nucl-ex] C. Nattrass (STAR), arXiv: /nucl-ex Baryon/meson ratios in Ridge similar to bulk for both strange and non-strange particles 17

26 Conclusions: Ridge Extensive data on Ridge
Cu+Cu, Au+Au consistent at same Npart Ridge/Jet ratio independent of energy Persists to high pTtrigger Ridge looks like bulk pTassociated dependence, particle composition Ridge larger in plane (not shown, arXiv: v1) Particles in Ridge not correlated with each other in Δη (not shown, arXiv: v1) Jet agreement between different systems, with scaled Pythia Simulations can be used to approximate zT distribution for comparisons of data to models More steeply falling jet spectrum in 62 GeV → stronger bias towards unmodified/surface jets Could explain smaller Ridge yield in 62 GeV 18

27 Models 19

28 Models Armesto et al, PRL 93 (2004) Radiated gluons broadened in pseudorapidity Longitudinal flow, Armesto et al, PRL 93 (2004) QCD magnetic fields, Majumder et al,Phys.Rev.Lett.99:042301,2007 Anisotropic plasma, P. Romatschke, PRC, (2007) So far unable to make enough Ridge arXiv: v2 20

29 Models Armesto et al, PRL 93 (2004) Radiated gluons broadened in pseudorapidity Longitudinal flow, Armesto et al, PRL 93 (2004) QCD magnetic fields, Majumder et al,Phys.Rev.Lett.99:042301,2007 Anisotropic plasma, P. Romatschke, PRC, (2007) So far unable to make enough Ridge Interaction of jet+medium Momentum kick from jet, C.-Y. Wong , Phys.Rev.C76:054908,2007 Medium heating + recombination, Chiu & Hwa, PRC72, Agrees with data but lots of fits to the data arXiv: v2 C.Y. Wong Private communication Npart 20

30 Models Armesto et al, PRL 93 (2004) Radiated gluons broadened in pseudorapidity Longitudinal flow, Armesto et al, PRL 93 (2004) QCD magnetic fields, Majumder et al,Phys.Rev.Lett.99:042301,2007 Anisotropic plasma, P. Romatschke, PRC, (2007) So far unable to make enough Ridge Interaction of jet+medium Momentum kick from jet, C.-Y. Wong , Phys.Rev.C76:054908,2007 Medium heating + recombination, Chiu & Hwa, PRC72, Agrees with data but lots of fits to the data Radial flow+trigger bias S. Voloshin, nucl-th/ , Nucl. Phys. A749, 287 C.. Pruneau, S. Gavin, S. Voloshin, arXiv: v2 E. Shuryak, Phys.Rev.C76:047901,2007 Need more detailed comparisons arXiv: v2 C.Y. Wong Private communication arXiv: v2Pruneau et al Npart Phys.Rev.C76:047901,2007 Shuryak Δφ 20

31 Models Armesto et al, PRL 93 (2004) Radiated gluons broadened in pseudorapidity Longitudinal flow, Armesto et al, PRL 93 (2004) QCD magnetic fields, Majumder et al,Phys.Rev.Lett.99:042301,2007 Anisotropic plasma, P. Romatschke, PRC, (2007) So far unable to make enough Ridge Interaction of jet+medium Momentum kick from jet, C.-Y. Wong , Phys.Rev.C76:054908,2007 Medium heating + recombination, Chiu & Hwa, PRC72, Agrees with data but lots of fits to the data Radial flow+trigger bias S. Voloshin, nucl-th/ , Nucl. Phys. A749, 287 C.. Pruneau, S. Gavin, S. Voloshin, arXiv: v2 E. Shuryak, Phys.Rev.C76:047901,2007 Need more detailed comparisons → No preferred model arXiv: v2 C.Y. Wong Private communication arXiv: v2Pruneau et al Npart Phys.Rev.C76:047901,2007 Shuryak Δφ 20

32 Conclusions Jet Ridge Pythia explains trends in data well
Needs scaling factor but amazing it does so well Energy, pTtrigger, pTassociated dependence Separation of Jet and Ridge works well Jet production dominated by fragmentation Deviations from fragmentation/Pythia indicate modification of jet Jet Extensive experimental data Models need more rigorous comparisons to data, more signatures to distinguish production mechanism Reasonable agreement of Jet with Pythia → simulations can be used to convert from pTtrigger to distribution of jet energies → Greater surface bias in 62 GeV could explain lower Ridge yield Ridge 21

33 STAR Collaboration Argonne National Laboratory - University of Birmingham - Brookhaven National Laboratory - California Institute of Technology - University of California, Davis - University of California - University of California, Los Angeles - Carnegie Mellon University - University of Illinois at Chicago - Creighton University - Nuclear Physics Institute Prague - Laboratory for High Energy (JINR) - Particle Physics Laboratory (JINR) - University of Frankfurt - Institute of Physics, Bhubaneswar - Indian Institute of Technology, Mumbai - Indiana University, Bloomington - Institut de Recherches Subatomiques - University of Jammu - Kent State University - Institute of Modern Physics, Lanzhou - Lawrence Berkeley National Laboratory - Massachusetts Institute of Technology - Max-Planck-Institut fuer Physik - Michigan State University - Moscow Engineering Physics Institute - City College of New York - NIKHEF and Utrecht University - Ohio State University, Columbus - Panjab University - Pennsylvania State University - Institute of High Energy Physics, Protvino, Russia - Purdue University - Pusan National University, Pusan, Republic of Korea - University of Rajasthan, Jaipur - Rice University - Universidade de Sao Paulo - University of Science & Technology of China - Shanghai Institute of Applied Physics - SUBATECH, Nantes, France - Texas A&M University - University of Texas - Tsinghua University - Valparaiso University - Variable Energy Cyclotron Centre, Kolkata, India - Warsaw University of Technology - University of Washington - Wayne State University - Institute of Particle Physics, CCNU (HZNU), Wuhan - Yale University - University of Zagreb 22 33 33

34 Backup slides

35

36 Jet-like peak width in central Au+Au
pTassoc > 2 GeV Putschke WWND08 STAR Preliminary Jet peak symmetric in Δη and Δφ for pTtrigger > 4 GeV and comparable to d+Au Jet peak asymmetric in Δη for pTtrigger < 4 GeV and significantly broader than d+Au

37 Ridge relative to reaction plane
Feng QM08 in-plane S=0 out-of-plane S=90o 3<pTtrig<4, 1.5<pTtrig<2.0 GeV/c In-plane Out-of-plane 1 4 3 2 5 6 STAR Preliminary Ridge 20-60% Jet 20-60% Jet part, near-side Ridge part, near-side Ridge yield decreases with φS. Smaller ridge yield at larger φS Jet yield approx. independent of φS and comparable with d+Au STAR Preliminary Jet yield independent of φS, 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. 19

38 3-particle correlations
d+Au Δη13 Δη12 random Au+Au 0-12% 13 12 enhancement suppression asymmetry 1 2 1 = A1-T 2 = A2-T Jet Jet 3<pTtrigger<10 1<pTassoc<3 ||<0.7 Ridge appears uniform event-by-event within STAR detector Radial flow + trigger bias S. Voloshin, nucl-th/ , Nucl. Phys. A749, 287 associated trigger 12 13 Long. flow picture Armesto et al, PRL 93 (2004) associated trigger 12 13

39 Jet-like peak width in central Au+Au
∆ projection ∆ projection Bombara SQM07 Bombara SQM07 McCumber QM08 Peak gets broader at higher pTtrigger, lower pTassoc Width in PHENIX kinematic range close to PHENIX acceptance

40 Extent of Ridge in  Wenger QM08 1/Ntrig dNch/d

41 Track merging ∆ projection ∆ projection Bombara SQM07     Intrinsic limits in two-track resolution →loss of tracks at small ,  Crossing of tracks,true merging of tracks Particle type dependent: affects reconstructed vertices (K0S,,) more Dependent on pT: affects lower pTtrigger, pTassoc more With Ridge/Jet separation method affects Jet only

42 Track merging correction
Calculate number of merged hits in a track pair from track geometry If the fraction of merged hits is greater than 10%, throw out the pair Do this for real and mixed event pairs Bin by helicity of trigger and associated and reflect the points from unaffected helicity bins to recover dip Bombara SQM07 h_tr = -1 h_as = 1 h_tr = 1 h_as = -1 genuine merging, most visible for low pt triggers h_tr - helicity of trigger h_as - helicity of associated

43 Identified trigger: Near-side Yield vs Npart
3.0 GeV/c < pTtrigger 6.0 GeV/c; 1.5 GeV/c < pTassociated < pTtrigger Jet yield - No trigger type dependence d+Au, Au+Au √sNN=200 GeV from nucl-ex/ Cu+Cu √sNN=200 GeV from SQM2007 Data points at same Npart offset for visibility Jet yields: 10% error added to V0 and h triggers to account for track merging, 15% to  triggers 43

44 Identified trigger: Near-side Yield vs Npart
3.0 GeV/c < pTtrigger 6.0 GeV/c; 1.5 GeV/c < pTassociated < pTtrigger Ridge yield - No trigger type dependence d+Au, Au+Au √sNN=200 GeV from nucl-ex/ Cu+Cu √sNN=200 GeV from SQM2007 Data points at same Npart offset for visibility Jet yields: 10% error added to V0 and h triggers to account for track merging, 15% to  triggers v2 errors shown only for h-h. K0S-h error bars comparable to h-h. -h and -h errors roughly 1.5 times as large as h-h. 44

45 Identified trigger: Jet yield vs pTtrigger
Cu+Cu Au+Au No trigger type dependence Au+Au √sNN = 200 GeV from nucl-ex/ Data points at same pTtrigger offset for visibility Jet yields: 10% error added to V0 and h triggers to account for track merging, 15% to  triggers 45

46 Identified associated yield vs pTtrigger
STAR Preliminary Au+Au STAR Preliminary Au+Au Cu+Cu Identified associated nucl-ex/ In Au+Au Jet:(Λ+Λ)/K0S ≈1 similar to vacuum fragmentation Ridge: Λ/K0S ≈ 2 similar to the bulk In Cu+Cu Jet: (Λ+Λ)/K0S ≈1 Ridge: Ratio not attainable Particle ratios in Jet similar to those in p+p 46

47 pT-distribution of associated particles
No trigger type dependence Jet – Associated baryons and mesons similar √sNN=200 GeV Au+Au 0-10% Cu+Cu: 0-54% √sNN=62 GeV Au+Au 0-80% Cu+Cu: 0-60% Fits assuming 1/pT dN/dpT = A pT exp(-pT/T)‏ nucl-ex/ , SQM2007 47

48 Momentum kick model Collisional energy loss of parton after hard scattering Fits shape in  Predicts sharp drop off with y Wenger QM08 Theory plots from C.Y. Wong, private communications

49 Momentum kick model Describes energy dependence
Predicts unusual Ridge spectrum Probably not measurable Theory plots from C.Y. Wong, private communications

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