Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Published byVernon Walters Modified over 8 years ago

Similar presentations

Presentation on theme: "1 High p T Hadron Correlation Rudolph C. Hwa University of Oregon Hard Probes 2006 Asilomar, CA, June 10, 2006 and No Correlation."— Presentation transcript:

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

2 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 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 4 same side STAR

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

6 6 Associated particle distribution in the recombination model -- for  only Hwa & Tan, PRC 72, 057902 (2005) STAR

7 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/0412061 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 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 9 Away side suppressionenhancement medium effect on away-side jet Jet quenching

10 10 suppressionenhancement Dijet fragmentation STAR, nucl-ex/0604018

11 11  production in AuAu central collision at 200 GeV Hwa & CB Yang, PRC70, 024905 (2004) fragmentation recombination

12 12 STAR dijet 481216 4 8 12 0 p T (assoc) p T (trig) 0.2 0.1

13 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/0604018

14 14 STAR, nucl-ex/0604018

15 15 481216 4 8 12 0 p T (assoc) p T (trig) STAR dijet z T =0.5-0.6 z T =0.8-0.9 Bielcikova PANIC 05

16 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 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 18 Correlation on the near side  and  distributions STAR, PRL 95, 152301 (2005) peaks

19 19 Chiu & Hwa, PRC 72, 034903 (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 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 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 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 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/0605054 Chiu’s talk in parallel session on Monday

24 24 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1 2345

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

26 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 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 28 STAR data on Autocorrelation for central Au+Au at 130 GeV for |  |  1.3, 0.15<pT<2 GeV/c nucl-ex/0605021 NO trigger, no subtraction Chiu & Hwa, PRC 73, 014903 (2006) TS recombination in a jet with pT>3 GeV/c dominated by soft partons

29 29 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1 2 3 4 5 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 30  and  production at intermediate p T For  strange-quark shower is very suppressed. p T distribution of  by recombination

31 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/0602024 recombination ss sss

32 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 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 34 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1 2 3 4 5 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 35 Forward production of hadrons PHOBOS, nucl-ex/0509034 Without knowing p T, it is not possible to determine x F Back et al, PRL 91, 052303 (2003)

36 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 37 proton-to-pion ratio is very large. proton pion Hwa & Yang, PRC 73,044913 (2006)  : momentum degradation factor

38 38 BRAHMS, nucl-ex/0602018

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

40 40  no shower partons involved  no jets involved  no jet structure  no associated particles Hwa & Yang, nucl- th/0605037 Thermal distribution fits well

41 41 A.Jet Correlation p T1 -p T2 1-21-2 1-21-2 near side away side auto-correl 1 2 3 4 5 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 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 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 30-40 GeV/c would have lots of observable associated particles.

44 44 Proton-to-pion ratio at LHC  -- probability of overlap of 2 jet cones single jet Hwa & Yang nucl- th/0603053

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

46 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.

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

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.

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

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.

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.

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,

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.

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 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.

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,

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.

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,

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 2006 1 What More Can Be Learned from High Pt Probes at RHIC? James Dunlop Brookhaven National Laboratory.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Similar presentations

Ads by Google