Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 A guide through pT landscale of di-hadron correlation Jiangyong Jia Stony Brook University EIC, 2007 and what can we learn about the partonic medium?

Published byChristal Osborne Modified over 9 years ago

Similar presentations

Presentation on theme: "1 A guide through pT landscale of di-hadron correlation Jiangyong Jia Stony Brook University EIC, 2007 and what can we learn about the partonic medium?"— Presentation transcript:

1 1 A guide through pT landscale of di-hadron correlation Jiangyong Jia Stony Brook University EIC, 2007 and what can we learn about the partonic medium?

2 2 Should I worry about non-flow in correlation? PHENIX: event plane measured at 3<|  <4, tracks in |  |<0.35 Embed PYTHIA dijet into HIJING event to estimate the non-flow due to jets HIJING event is weighed with measured v2(pt, ,b) PYTHIA has 10 GeV dijet Dijet->Biased Event plane->Fake v2 for trigger of the embedded jets. Use away-side pp jet to approximate the ridge Near jet Away jet ΦΦ ηη Ridge  Hijing+flow

3 3 Should I worry about non-flow in correlation? PHENIX: event plane measured at 3<|  <4, tracks in |  |<0.35 Embed PYTHIA dijet into HIJING event to estimate the non-flow due to jets HIJING event is weighed with measured v2(pt, ,b) PYTHIA has 10 GeV dijet Dijet->Biased Event plane->Fake v2 for trigger of the embedded jets. Use away-side pp jet to approximate the ridge 3.0  4.0 0.4  2.8 Fake v2 nucl-ex/0609009 Near jet Away jet ΦΦ ηη Ridge  Hijing+flow

4 4 What v2 to use in correlation? C(  ) =  (1+2 cos2  ) + J(  ) Non-flow due to jet is small with BBC Event plane Other Non-flow and v2 fluctuations contribute to C(  ), so should be included in the two source model. If minijets are important, then it should be much longer range in , or many minijets emitted in a correlated way?

5 5 5 3 R AA pT 1 Jet Flow+coalescense How the energy of the 80% jet redistributed to low pT? How to separate the Hard and Soft contribution down to low pT? Production mechanisms: Jet (>5 GeV/c) and Flow+coalescense 0.2 Sources of single particles

6 6 5 3 R AA pT 1 Jet Flow+coalescense How the energy of the 80% jet redistributed to low pT? How to separate the Hard and Soft contribution down to low pT? Jet correlation: Energy dissipation to low pT partonic stage: Jet energy couple with hydro-flow hadronization stage: Correlation affected by the coalescence process Jet correlation provide constraints on the Geometrical bias Production mechanisms: Jet (>5 GeV/c) and Flow+coalescense 0.2 Sources of single particles

7 7 Sources of “jet” pairs Jet fragmentation contribution: Near jet and away jet Medium-induced contributions: Near-side Ridge, away-side Cone. Energy at low pT How they evolve/compete in pT1 vs pT2 landscape? Ridge Cone Near jet Away jet 0 

8 8 High pT : Geometrical bias I AA  R AA, Why?? STAR, Phys. Rev. Lett. 97 (2006) 162301 I AA Transmission, Absorptionshift T. Renk notation 0.2

9 9 PRC.71:034909,2005 Absorption picture always predicts I AA <R AA. Need shift term! High pT : Geometrical bias I AA  R AA, Why?? STAR, Phys. Rev. Lett. 97 (2006) 162301 I AA pT R AA Transmission, Absorptionshift T. Renk notation 0.2 Shift term is needed For fixed R AA, a larger eloss required for a flatter spectra

10 10 Energy shift  0 spectra n= 8.1 in dn/ptdpt n=4.8 in dn/dpt for 5-10 GeV/c trigger Per-trigger spectra Away spectra flatter than single spectra

11 11 Energy shift  0 spectra n= 8.1 in dn/ptdpt n=4.8 in dn/dpt for 5-10 GeV/c trigger Per-trigger spectra Bigger fractional eloss + flatter spectra --> Iaa ~ Raa For  -jet, I AA >R AA ! constrains the geometry bias by combing Iaa and Raa nucl-ex/0410003 50% bigger Away spectra flatter than single spectra

12 12 Correlation landscape in pTA, pTB Suppression in HR, enhancement in SR Peak location D independent of pT, jet reappearance not due to merging of side peaks? Dip grows Jet emerges arXiv:0705.3238 [nucl-ex]

13 13 Correlation landscape in pTA, pTB Head region: Suppression of jet Shoulder Region: Response of the medium pTApTA pTBpTB Many possible routes! A single number summarizing the shape: R HS Dip: R HS 1; flat: R HS =1 Jet shape symmetry : R HS (p T A, p T B ) = R HS (p T B, p T A )

14 14 Awayside modification pattern vs pT 1 R HS Shoulder region dominant! p T A,B >5 -> R HS >1 -> Head region dominant! p T A,B R HS ~1 -> SR feed in + radiated gluons? arXiv:0705.3238 [nucl-ex] Cone Flat Peak p t,1 p t,2 >  5 1  <p t,1 p t,2 <  4 Competition between “Head” and “shoulder”. Suppression and enhancement

15 15 Near side Jet spectra shape: Near and Shoulder region Near-side: flat with Npart (>100), increase with p T A. Jet fragmentation S region: flat with Npart (>100), independent of p T A ! Universal slope, reflects property of the medium? Mean-pT at intermediate pT (1<pTB< 5) vs. Npart arXiv:0705.3238 [nucl-ex] 2<p T A <3 3<p T A <4 4<p T A <5

16 16 Near side Away shoulder Jet spectra shape: Near and Shoulder region Near-side: flat with Npart (>100), increase with p T A. Jet fragmentation S region: flat with Npart (>100), independent of p T A ! Universal slope, reflects property of the medium? Mean-pT at intermediate pT (1<pTB< 5) vs. Npart arXiv:0705.3238 [nucl-ex] 2<p T A <3 3<p T A <4 4<p T A <5

17 17 Chemistry of Shoulder Similar shape for asso Baryon and Meson 0-20% 2.5-4x1.6-2 GeV/c Jet frag.<Bayron/meson<  bulk medium. W. Holtzmann

18 18 Chemistry of the Shoulder? u d u u d uu d d u uu d d u Bulk medium are boosted by shock wave, which then coalesce into hadrons? => jet frag.<Bayron/meson<Bulk Coalescence plays a big role here. Cooper-Fryer

19 19 Parton-medium interaction 1) Radiative energy loss -> High pT suppression 2) Lost energy converted into flow -> Intermediate pT enhancement 3) Remaining propagate -> Gluon feedback at low pT Propagation mode Collective mode Coupling with medium: Mach flow / deflection. Deflected jet Punch-through jet Large angle radiation Deflection: Deflection angle decrease with increasing pT? No enhancement in multiplicity?

20 20 Radiation contribution A.Polosa, C. Salgado, hep-ph/0607295, sudokov splitting C. Salgado, U. Wiedemann, hep-ph/0310079 I. Vitev, gluon feedback Can be large angle => But for hard jets, radiation almost collinear Can explain multiplicity

21 21 Near side: jet+ ridge Near side Components  jet peak  Elongated ridge 3 < p t,trigger < 4 GeV p t,assoc. > 2 GeV Au-Au 0-10% STAR preliminary

22 22 Near-side shape modification Trigger p T = 2.5-4 x 2-3 GeV/c  width broadening limited to intermediate pT Broaden at intermediate pT unmodified at high pT

23 23 Modifications decrease with increasing trigger pT (flattening) Modification limited to p T A,B  4 GeV/c, similar to the away-side Shoulder. STAR: This is due to the Ridge. Near-side yield modification: I AA Jet Ridge Dilution effects due to soft triggers

24 24 Intermediate pT : dilution effect per-jet yield Quantification via I AA is complicated when the trigger jet is modified.  per-trig yield Dilutions effects Triggers have recombination contribution Boost from the radial flow? Trigger jet multiplicity is enhanced due to interaction with medium I AA reflects modification on Pairs √ and Triggers x

25 25 Near side Iaa We calculate the pair suppression factor, Jaa, from Iaa and Raa R AA

26 26 Near side Jaa At high pT, both hadrons comes from same jet! The J AA represent the suppression on the jet (>pt1+pt2). Since Jet suppression is constant at high pT, Jaa should approach the constant R AA level at high pT! Real enhancement is factor of 4-5 at low pT? (no suppression of jet pairs!) Imply intermediate pT single enhancement not due to jets?! Leading hadron suppression Jet pair suppression =

27 27 Role of hadronization in correlation? Bulk hadronization mechanisms can affect both the single (Thermal+Thermal Reco) and pairs (Thermal+Shower reco). Can it modify the correlation? If so, how to isolate the pure partonic medium effect? X.N. Wang et.al : in medium fragmentation Parton-medium interaction Hadronization via Coalescence

28 28 Jet contribution at low pT? Once we map out the jet properties in pT1, pT2, can we combine correlation results with single particle measurements and estimate the jet contribution or contribution initiated by jet, as function of pT. 5 3 R AA pT 1 Jet Flow+coalescense 0.2

29 29 We know the ratio of jet pair/combinatoric pair vs pT1, pT2. How to translate this into single yield from jet? Jet contribution at low pT?

30 30 Ridge and cone : different mechanism? Both have similar property in pT and PID composition and softer than jet. They are results of same matter, ridge and cone mechanism should play a role on both sides. Reduced/no surface bias for intermediate pT correlation. Ridge Cone Near jet Away jet 0  

31 31 Summary Jet correlation @ high pT provide constraints on the and geometrical bias Jet correlation @ intermediate pT shows complex evolution due to competition between Jet quenching and medium response on both near- and away-side. Constrain the particle production mechanism by combing single and correlation landscape in pT. Physics varying drastically with pT, good model should describe the full pT dependence.

32 32 Backup

33 33 Head region: jet punch-through Low pTB range, decrease with Npart Turn on of jet quenching, soft contribution dominates High pTB range, flat with Npart Punch through jet dominate and has same slope (soft contribution dies out) STAR Preliminary |  |<0.4 dn/d  Fuqiang

34 34 Details of the suppression and enhancement HR exhibits early onset of suppression, relative to p+p, approach Raa at high pT: jet quenching! H+S (entire away side) exhibits overall enhancement due to SR, up to p T A,B <4 GeV/c I AA depends on the integration window! arXiv:0705.3238 [nucl-ex]

35 35 Integration range and pT matters! One might reach misleading conclusion if only focus on limited pT. No Modification seen in HR for this pTA x pTB bin but: Would see enhancement for this pTA x pTB bin in the SR+HR, and At high pT, would see a suppression even in SR+HR, and At low pT, would see an enhancement even in HR. Thus it is important to map out the full pTA, pTB and  space! HR SR

36 36

37 37 pT evolution of jet function

38 38

39 39

Download ppt "1 A guide through pT landscale of di-hadron correlation Jiangyong Jia Stony Brook University EIC, 2007 and what can we learn about the partonic medium?"

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.
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.
Photon-Jet Correlations at RHIC Saskia Mioduszewski Texas A&M University 18 July, 2007.

Photon-Jet Correlations at RHIC Saskia Mioduszewski Texas A&M University 18 July, 2007.
BNL Seminar 10/02 High p t Hadrons in STAR: Past, Present, and Future Michael L. Miller Yale University For the STAR Collaboration.

BNL Seminar 10/02 High p t Hadrons in STAR: Past, Present, and Future Michael L. Miller Yale University For the STAR Collaboration.
Jet Reconstruction in PHENIX l Mike McCumber – University of Colorado & l Barbara Jacak – Stony Brook University With thanks to Yue Shi Lai and John Chen.

Jet Reconstruction in PHENIX l Mike McCumber – University of Colorado & l Barbara Jacak – Stony Brook University With thanks to Yue Shi Lai and John Chen.
Probing Properties of the QCD Medium via Heavy Quark Induced Hadron Correlations Huan Zhong Huang Department of Physics and Astronomy University of California.

Probing Properties of the QCD Medium via Heavy Quark Induced Hadron Correlations Huan Zhong Huang Department of Physics and Astronomy University of California.
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.
Ali Hanks - APS 2008 1 Direct measurement of fragmentation photons in p+p collisions at √s = 200GeV with the PHENIX experiment Ali Hanks for the PHENIX.

Ali Hanks - APS Direct measurement of fragmentation photons in p+p collisions at √s = 200GeV with the PHENIX experiment Ali Hanks for the PHENIX.
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.
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.
STAR 1 Strange Particle Ratios on the Near- & Away-Side of Jets at RHIC Jiaxu Zuo BNL/SINAP with Paul Sorensen BNL For STAR Collaboration 23rd Winter Workshop.

STAR 1 Strange Particle Ratios on the Near- & Away-Side of Jets at RHIC Jiaxu Zuo BNL/SINAP with Paul Sorensen BNL For STAR Collaboration 23rd Winter Workshop.
Michael P. McCumber for the PHENIX Collaboration Quark Matter 2008 Jaipur, India 5 February 2008 The “Shoulder” and the “Ridge” in PHENIX: Medium Response.

Michael P. McCumber for the PHENIX Collaboration Quark Matter 2008 Jaipur, India 5 February 2008 The “Shoulder” and the “Ridge” in PHENIX: Medium Response.
Oana Catu, Yale University for the STAR Collaboration Quark Matter 2008, February 4-10, Jaipur, India System size dependence of dihadron correlations and.

Oana Catu, Yale University for the STAR Collaboration Quark Matter 2008, February 4-10, Jaipur, India System size dependence of dihadron correlations and.
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.
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.
Two-, Three-, and Jet-Hadron Correlations at STAR Kolja Kauder for the STAR Collaboration Rencontres de Moriond – La Thuile, Mar 20-27 2011.

Two-, Three-, and Jet-Hadron Correlations at STAR Kolja Kauder for the STAR Collaboration Rencontres de Moriond – La Thuile, Mar
1 Mapping out the Jet correlation landscape: Perspective from PHENIX Jiangyong Jia for PHENIX Collaboration Stony Brook University & BNL 23th WWND Big.

1 Mapping out the Jet correlation landscape: Perspective from PHENIX Jiangyong Jia for PHENIX Collaboration Stony Brook University & BNL 23th WWND Big.
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