1 High p T Hadron Correlation Rudolph C. Hwa University of Oregon Hard Probes 2006 Asilomar, CA, June 10, 2006 and No Correlation.

Slides:

Advertisements

Similar presentations

1 Jet Structure of Baryons and Mesons in Nuclear Collisions l Why jets in nuclear collisions? l Initial state l What happens in the nuclear medium? l.

Advertisements

Effects of minijet degradation on hadron observables in heavy-ion collisions Lilin Zhu Sichuan University QPT2013, Chengdu.

Photon-Hadron Correlations at RHIC Saskia Mioduszewski Texas A&M University E-M Workshop of RHIC/AGS Users’ Meeting 27 May, 2008.

Jet probes of nuclear collisions: From RHIC to LHC Dan Magestro, The Ohio State University Midwest Critical Mass October 21-22, 2005.

1 High-p T Physics at RHIC and Evidences of Recombination Rudolph C. Hwa University of Oregon International Symposium on Multiparticle Dynamics Sonoma,

Correlation in Jets at RHIC Rudolph C. Hwa University of Oregon Institute of Nuclear Theory University of Washington December 5, 2006.

High-p T spectra and correlations from Cu+Cu and Au+Au collisions in STAR Marco van Leeuwen, LBNL for the STAR collaboration.

High p T Physics in Heavy Ion Collisions Rudolph C. Hwa University of Oregon CIAE, Beijing June 13, 2005.

Correlation in Jets Rudolph C. Hwa University of Oregon Workshop on Correlation and Fluctuation in Multiparticle Production Hangzhou, China November 21-24,

Understanding Jet Energy Loss with Angular Correlation Studies in PHENIX Ali Hanks for the PHENIX Collaboration 24 th Winter Workshop on Nuclear Dynamics.

Resolution of Several Puzzles at Intermediate p T and Recent Developments in Correlation Rudolph C. Hwa University of Oregon Quark Matter 05 Budapest,

Dunlop, WW What More Can Be Learned from High Pt Probes at RHIC? James Dunlop Brookhaven National Laboratory.

Understanding Jet Energy Loss with Angular Correlation Studies in PHENIX Ali Hanks for the PHENIX Collaboration 24 th Winter Workshop on Nuclear Dynamics.

Hard Probes at RHIC Saskia Mioduszewski Texas A&M University Winter Workshop on Nuclear Dynamics 8 April, 2008.

WWND 03/13/06 N Grau1 Jet Correlations from PHENIX Focus entirely on A+A collisions High-trigger p T correlations –Can we do jet tomography? Low-trigger.

Future Measurements to Test Recombination Rudolph C. Hwa University of Oregon Workshop on Future Prospects in QCD at High Energy BNL, July 20, 2006.

Jana Bielcikova (Yale University) for the STAR Collaboration 23 rd Winter Workshop on Nuclear Dynamics February 12-18, 2007 Two-particle correlations with.

Betty Abelev UI Chicago Testing the Recombination Model at RHIC using multi-strange baryon correlations for the STAR Collaboration 23 rd Winter Workshop.

Jana Bielcikova (Yale University) High-p T physics at LHC, Jyväskylä March 23-27, 2007 Strange particle correlations – coalescence at RHIC and LHC.

STAR Back-to-Back Di-Jet Triggered Multi-Hadron Correlations as Medium Probes in STAR Back-to-Back Di-Jet Triggered Multi-Hadron Correlations as Medium.

Interaction between jets and dense medium in heavy-ion collisions Rudolph C. Hwa University of Oregon TsingHua University, Beijing, China May 4, 2009.

J. RuppertFocus talk on interactions between jets and medium #1 Focus talk on interactions between jets and medium Jörg Ruppert Nuclear Theory, Duke University.

What’s Missing in our Current Picture from High p T Measurements at RHIC? Saskia Mioduszewski Texas A&M University 23 March, 2007.

Enke Wang (Institute of Particle Physics, Huazhong Normal University) with A. Majumder, X.-N. Wang I. Introduction II.Quark Recombination and Parton Fragmentation.

A NLO Analysis on Fragility of Dihadron Tomography in High Energy AA Collisions I.Introduction II.Numerical analysis on single hadron and dihadron production.

Identified Particle Ratios at large p T in Au+Au collisions at  s NN = 200 GeV Matthew A. C. Lamont for the STAR Collaboration - Talk Outline - Physics.

1 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Nuclear Induced Particle Suppression at Large-x F at RHIC J.H. Lee Physics Department Brookhaven National Laboratory.

1 Identified Di-hadron Correlation in Au+Au & PYTHIA Simulation Jiaxu Zuo Shanghai Institute of Applied Physics & BNL CCAST Beijing,

Background introduction Model introduction Analysis method Results and discussions Conclusions Collaborators: S. Zhang, Y. G. Ma, H. Z. Huang, X. Z, Cai,

An experimental perspective on first jet measurements at LHC: Lessons from RHIC Dan Magestro, The Ohio State University ALICE-USA Collaboration Meeting.

1 Jet Structure of Baryons and Mesons in Nuclear Collisions l Why jets in nuclear collisions? l Initial state l What happens in the nuclear medium? l.

Olga Barannikova, UIC Probing the Medium at RHIC by Identified Particles.

N. N. Ajitanand Nuclear Chemistry, SUNY, Stony Brook For the PHENIX Collaboration Two and Three particle Flavor Dependent Correlations Remember the hungarian.

20-25 May 2007 The Berkeley School STAR Study of Jets with 2+1 multi-particle correlations Richard Hollis* for the STAR Collaboration * in close collaboration.

Hot Quarks 2004 July 23, 2004, Taos, New Mexico Tatsuya Chujo Hadron Production at Intermediate p T at RHIC Tatsuya Chujo Vanderbilt University for the.

1 A NLO Analysis on Fragility of Dihadron Tomography in High-Energy Nuclear Collisions Enke Wang Institute of Particle Physics, Central China Normal University.

Large p/  Ratio without Jet Correlations at RHIC and LHC Rudolph C. Hwa University of Oregon November 14-20, 2006 Shanghai, China The Omega challenge.

1 Olga Barannikova University of Illinois at Chicago LHC09, Prague Multi-hadron correlations at RHIC and LHC Olga Barannikova.

Away-side distribution in a parton multiple-scattering model and background-suppressed measures Charles B. Chiu Center for Particle Physics and Department.

1 34th International Conference on High Energy Physics (ICHEP 2008) ‏ The STAR Experiment Texas A&M University A. Hamed for the STAR collaboration Direct.

Jet Physics in ALICE Mercedes López Noriega - CERN for the ALICE Collaboration Hot Quarks 2006 Villasimius, Sardinia - Italy.

Background introduction Model introduction Analysis method Results and discussions Conclusions G.L. Ma, S. Zhang, YGM et al., Phys Lett B 641, 362 (2006)

1 High-p T probes of QCD matter Marco van Leeuwen, Utrecht University.

Phantom Jets: the  puzzle and v 2 without hydrodynamics Rudolph C. Hwa University of Oregon Early Time Dynamics in Heavy Ion Collisions Montreal, July.

What is the ridge? And why you should care Christine Nattrass University of Tennessee at Knoxville.

Ridge Formation and Long Range Correlations in pp Collisions at CMS C.B. Yang Institute of Particle Physics Central China Normal University Wuhan ,

STAR Modification of high-p T hadro-chemistry in Au+Au collisions relative to p+p Anthony Timmins for the STAR Collaboration 31st July 2009 Heavy-ion III.

Correlations at Intermediate p T Rudolph C. Hwa University of Oregon Correlations and Fluctuations in Relativistic Nuclear Collisions MIT, April 2005.

1 Parton Recombination at all p T Rudolph C. Hwa University of Oregon Hard Probes 2004 Ericeira, Portugal, November 2004.

Correlation of Hadrons in Jets Produced at RHIC Rudolph C. Hwa University of Oregon Workshop on QCD and RHIC physics Wuhan, June 22, 2005.

Near-side  correlations of high-p t hadrons from STAR Jörn Putschke for the STAR collaboration Lawrence Berkeley National Laboratory Weisshorn (4505m),

News from ALICE Jan PLUTA Heavy Ion Reaction Group (HIRG) Warsaw University of Technology February 22, XIII GDRE Workshop, SUBATECH, Nantes.

The Art Poskanzer School 1. 2 Physics motivation To create and study QGP – a state of deconfined, thermalized quarks and gluons predicted by QCD at high.

Quark Matter 2005, Budapest Xin-Nian Wang Lawrence Berkeley National Laboratory Jet and Leading Hadron Production.

2008/04/12APS April Meeting 1 Decomposition of Awayside Components of Dijet Correlation in Au+Au Collisions at √S NN = 200 GeV at PHENIX Chin-Hao Chen.

1 Probing dense matter at extremely high temperature Rudolph C. Hwa University of Oregon Jiao Tong University, Shanghai, China April 20, 2009.

Kirill Filimonov, ISMD 2002, Alushta 1 Kirill Filimonov Lawrence Berkeley National Laboratory Anisotropy and high p T hadrons in Au+Au collisions at RHIC.

Xin-Nian Wang/LBNL QCD and Hadronic Physics Beijing, June 16-20, 2005 Xin-Nian Wang 王新年 Lawrence Berkeley National Laboratory Jet Tomography of Strongly.

Hadron RHIC at intermediate and high p T Conference on Intersections between Particle and Nuclear Physics New York, NY, May 20-23, 2003 Berndt.

Jana Bielcikova (Yale)ISMD 2007, Berkeley1 Near-side di-hadron correlations at RHIC Jana Bielcikova (Yale University)

Toward a  +Jet Measurement in STAR Saskia Mioduszewski, for the STAR Collaboration Texas A&M University 1.

Recent developments in RHIC physics Rudolph C. Hwa University of Oregon IHEP seminar June 14, 2005.

TWO PARTICLE CORRELATION MEASUREMENTS AT PHENIX Takahito Todoroki For the PHENIX Collaboration University of Tsukuba & RIKEN Nishina Center Hard Probes.

Rudolph C. Hwa University of Oregon

International CCAST Summer School and Workshop on QCD and RHIC Physics

Fragmentation or Recombination at High pT?

Identified Charged Hadron

Shengli Huang Vanderbilt University for the PHENIX Collaboration

Identified Particle Production at High Transverse Momentum at RHIC

Future Measurements to Test Recombination

Presentation transcript:

1 High p T Hadron Correlation Rudolph C. Hwa University of Oregon Hard Probes 2006 Asilomar, CA, June 10, 2006 and No Correlation

2 A. Conventional scenario Hard scattering  high p T jet  hadron correlation (usual conductor has resistance) (superconductor has no resistance) High p T hadrons  high p T jet  correlation B. Unconventional scenario

3 B.No Jet Correlation 1.  and  production up to p T ~ 6 GeV/c 2.Forward production at any p T 3.Large p T at LHC A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1

4 same side STAR

5 Associated particle p T distribution p 1 -- trigger p 2 -- associated k q3q3 q1q1 q4q4 q2q2 In the recombination model

6 Associated particle distribution in the recombination model -- for  only Hwa & Tan, PRC 72, (2005) STAR

7 in white paper Remember p/  ratio All in recombination/ coalescence model Medium modified dihadron fragmentation function -- more relevant at higher p T. Majumder, Wang, Wang nucl-th/ S S -- fragmentation T S Jet tomography CGC forward production All use fragmentation for hadronization -- but not reliable at intermediate p T If proton production cannot be described by fragmentation at intermediate p T, how much trust can be placed on pion production by fragmentation? TTT TT

8 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1 2

9 Away side suppressionenhancement medium effect on away-side jet Jet quenching

10 suppressionenhancement Dijet fragmentation STAR, nucl-ex/

11  production in AuAu central collision at 200 GeV Hwa & CB Yang, PRC70, (2004) fragmentation recombination

12 STAR dijet p T (assoc) p T (trig)

13 Trigger-normalized fragmentation function Trigger-normalized momentum fraction is measurable without direct knowledge of the parton energy. X.-N. Wang, Phys. Lett. B 595, 165 (2004) J. Adams et al., nucl-ex/

14 STAR, nucl-ex/

p T (assoc) p T (trig) STAR dijet z T = z T = Bielcikova PANIC 05

16 STAR claims universal behavior in D(z T ) fragmentation violation of universal behavior due to medium effect ---- thermal-shower recombination Suggestion: look for p/  ratio in this region. Large if dominated by recombination.

17 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1 23

18 Correlation on the near side  and  distributions STAR, PRL 95, (2005) peaks

19 Chiu & Hwa, PRC 72, (2005) hard parton shower parton, leads to the trigger particle energy loss converts to soft particles At higher trigger momentum, the hard parton originate closer to the surface, so less energy is lost. Hence no pedestal. hard parton trigger hadron At low trigger momentum, hard partons can originate farther in.  Those soft particles form the pedestal. pedestal  T=15 MeV

20 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1 234

21 Casalderrey-Solana, Shuryak, Teaney Mach cone DreminCherenkov gluons Ruppert, Muller color wake Koch, Majumder, Wang Cherenkov radiation Vitevjet quenching+fragm. Chiu, Hwaparton multiple scattering Away-side distribution

22 Parton multiple-scattering model Sample trajectories for 2.5<p(trig)<4, 1<p(assoc)<2.5 exit tracks absorbed (thermalized) tracks high p T parton

23 Away-side  distribution -  PHENIX 2.5<p(trig)<4 parton p=4.5 energy loss thermalized Event averaged, background subtracted. Cannot distinguish between 1-jet and 2-jet contributions (e.g., Mach cone) A new measure proposed that suppresses statistical background event-by-event Chiu & Hwa, nucl-th/ Chiu’s talk in parallel session on Monday

24 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl

25 Autocorrelation Trainor (STAR) Jamaica workshop (2004) Consider an example in time series analysis

26 Correlation function Treat 1,2 on equal footing --- no trigger The only non-trivial contribution to near, would come from jets Define Fix and, and integrate over all other variables in Autocorrelation No ambiguous subtraction procedure; only do as defined.

27 hard parton momentum k Radiated gluon momentum q  two shower partons with angular difference  (a much larger set) jet axis q2q2 q1q1 x y z  22 11 k thermal partons p2p2 p1p1 x y z  11 22 pion momenta (observable) --

28 STAR data on Autocorrelation for central Au+Au at 130 GeV for |  |  1.3, 0.15<pT<2 GeV/c nucl-ex/ NO trigger, no subtraction Chiu & Hwa, PRC 73, (2006) TS recombination in a jet with pT>3 GeV/c dominated by soft partons

29 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl B.No Jet Correlation 1.  and  production up to p T ~ 6 GeV/c 2.Forward production at any p T 3.Large p T at LHC

30  and  production at intermediate p T For  strange-quark shower is very suppressed. p T distribution of  by recombination

31 s hard parton scattering fragmentation If they are produced by hard scattering followed by fragmentation, one expects jets of particles. There are other particles associated with and Hwa & CB Yang, nucl-th/ recombination ss sss

32 Select events with  or  in the 3<p T <6 region, and treat them as trigger particles. Predict: no associated particles giving rise to peaks in , near-side or away-side. We claim that no shower partons are involved in  production, so no jets are involved.

33  (1/N trig ) dN/d(  ) background Signal p+p Jet-like structures Au+Au top 5%  trigger (pT>3 GeV/c) in Au+Au ? charged hadrons

34 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl B.No Jet Correlation 1.  and  production up to p T ~ 6 GeV/c 2.Forward production at any p T 3.Large p T at LHC

35 Forward production of hadrons PHOBOS, nucl-ex/ Without knowing p T, it is not possible to determine x F Back et al, PRL 91, (2003)

36 Theoretically, can hadrons be produced at x F > 1? It seems to violate momentum conservation, p L > √s/2. In pB collision the partons that recombine must satisfy p B But in AB collision the partons can come from different nucleons BA (TFR) In the recombination model the produced p and  can have smooth distributions across the x F = 1 boundary.

37 proton-to-pion ratio is very large. proton pion Hwa & Yang, PRC 73, (2006)  : momentum degradation factor

38 BRAHMS, nucl-ex/

39 TT TS TTT x F = 0.9 x F = 0.8 TFR x F = 1.0

40  no shower partons involved  no jets involved  no jet structure  no associated particles Hwa & Yang, nucl- th/ Thermal distribution fits well

41 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl B.No Jet Correlation 1.  and  production up to p T ~ 6 GeV/c 2.Forward production at any p T 3.Large p T at LHC

42  and p production at high p T at LHC New feature at LHC: density of hard partons is high. High p T jets may be so dense that neighboring jet cones may overlap. If so, then the shower partons in two nearby jets may recombine. 2 hard partons 1 shower parton from each  p

43 The particle detected has some associated partners. There should be no observable jet structure distinguishable from the background. GeV/c That is very different from a super-high p T jet. But they are part of the background of an ocean of hadrons from other jets. A jet at GeV/c would have lots of observable associated particles.

44 Proton-to-pion ratio at LHC  -- probability of overlap of 2 jet cones single jet Hwa & Yang nucl- th/

45 We predict for 10<p T <20 Gev/c at LHC Large p/  ratio NO associated particles above the background

46 Summary B.No Jet Correlation 1.  and  production up to p T ~ 6 GeV/c 2.Forward production at any p T 3.Large p T at LHC A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl Jet fragmentation at high and Recombination at No trigger bias, need more data at high p T There’s jet quenching, but not necessarily fragmentation ? ? ? When recombination dominates over fragmentation, B/M ratio can be very large, and there would be no jets, no jet structure and no correlation above background.