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

Slides:



Advertisements
Similar presentations
Elliptic flow of thermal photons in Au+Au collisions at 200GeV QNP2009 Beijing, Sep , 2009 F.M. Liu Central China Normal University, China T. Hirano.
Advertisements

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.
TJH: ISMD 2005, 8/9-15 Kromeriz, Czech Republic TJH: 1 Experimental Results at RHIC T. Hallman Brookhaven National Laboratory ISMD Kromeriz, Czech Republic.
1 Dihadron Tomography of High Energy AA Collisions in NLO pQCD Hanzhong Zhang Department of Physics, Shandong University Institute of Particle Physics,
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.
Charm & bottom RHIC Shingo Sakai Univ. of California, Los Angeles 1.
Jet Discovery of Jet Quenching and Beyond Xin-Nian Wang LBNL, June 29, 05.
Identified particle transverse momentum distributions in 200 GeV Au+Au collisions at RHIC 刘海东 中国科技大学.
Relativistic Heavy-Ion Collisions: Recent Results from RHIC David Hardtke LBNL.
Winter Workshop on Nuclear Dynamics – San Diego, 16 Mar. 2006John Harris (Yale) Suppression of Non-photonic Electrons at High Pt John W. Harris Yale University.
High-p T spectra and correlations from Cu+Cu and Au+Au collisions in STAR Marco van Leeuwen, LBNL for the STAR collaboration.
03/14/2006WWND2006 at La Jolla1 Identified baryon and meson spectra at intermediate and high p T in 200 GeV Au+Au Collisions Outline: Motivation Intermediate.
Understanding Jet Energy Loss with Angular Correlation Studies in PHENIX Ali Hanks for the PHENIX Collaboration 24 th Winter Workshop on Nuclear Dynamics.
1 Surface (表层) versus volume (深层) emission in photon-hadron correlations Han-Zhong Zhang Institute of Particle Physics, Huazhong Normal University, China.
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.
Luan Cheng (Institute of Particle Physics, Huazhong Normal University) I. Introduction II. Interaction Potential with Flow III. Flow Effects on Light Quark.
Single & Dihadron Suppression at RHIC and LHC Xin-Nian Wang Lawrence Berkeley National Laboratory Last call for prediction for LHC, CERN, May 29-June 2,2007.
Centrality-dependent pt spectra of Direct photons at RHIC F.M. Liu 刘复明 Central China Normal University, China T. Hirano University of Tokyo, Japan K.Werner.
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.
Direct photon production in pp and AA collisions 合肥, Dec 5 - 7, 2009 刘复明 华中师范大学粒子物理研究所 FML, T.Hirano, K.Werner, Y. Zhu, Phys.Rev.C79:014905,2009. FML,
DPG spring meeting, Tübingen, March Kai Schweda Lawrence Berkeley National Laboratory for the STAR collaboration Recent results from STAR at RHIC.
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.
‘2+1’ correlation – Tagging of Back to Back Jets GREESHMA K M IIT Bombay ALICE-India Meet 27 th & 28 th April
Enke Wang (Institute of Particle Physics, Huazhong Normal University) with A. Majumder, X.-N. Wang I. Introduction II.Quark Recombination and Parton Fragmentation.
Jets at RHIC Jiangyong Jia
A NLO Analysis on Fragility of Dihadron Tomography in High Energy AA Collisions I.Introduction II.Numerical analysis on single hadron and dihadron production.
Anomaly of over ratios in Au+Au collision with jet quenching Xiaofang Chen IOPP, CCNU Collaborator: Enke Wang Hanzhong Zhang Benwei Zhang Beijing Mar.
Winter Workshop on Nuclear Dynamics Jet studies in STAR via 2+1 correlations Hua Pei For the STAR Collaboration.
U N C L A S S I F I E D 7 Feb 2005 Studies of Hadronic Jets with the Two-Particle Azimuthal Correlations Method Paul Constantin.
1 Search for the Effects of the QCD Color Factor in High-Energy Collisions at RHIC Bedanga Mohanty LBNL  Motivation  Color Factors  Search for Color.
Jet Quenching and Its effects in Strong Interaction Matter
Luan Cheng (Institute of Particle Physics, Huazhong Normal University) I.Introduction II. Potential Model with Flow III.Flow Effects on Parton Energy Loss.
Heavy flavor production at RHIC Yonsei Univ. Y. Kwon.
1 Surface versus volume emissions in photon-hadron correlations Han-Zhong Zhang Institute of Particle Physics, Huazhong Normal University, China Collaborators:
Studying heavy-ion collisions exploiting high-pt particles at STAR The 6 th International Workshop of high-pt particles Utrecht, Netherlands 4-7th April,
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.
Francesco Noferini Bologna University Erice, Italy 31 st August 2006 Two-particle correlations: from RHIC to LHC.
1 Away-side Modification and Near-side Ridge Relative to Reaction Plane at 200 GeV Au+Au Collisions 第十届全国粒子物理学术会议 (南京) Apr. 28th, 2008 Aoqi Feng, Fuqiang.
Probing the properties of dense partonic matter at RHIC Y. Akiba (RIKEN) for PHENIX collaboration.
Jet Jet Tomography of Hot & Dense Matter Xin-Nian Wang LBNL, June 25, 2003.
07/27/2002Federica Messer High momentum particle suppression in Au-Au collisions at RHIC. Federica Messer ICHEP th international Conference on high.
High-p T Particles and RHIC Paradigm of Jet Quenching Ahmed M. Hamed NN2012 The 11 th International Conference on Nucleus-Nucleus Collisions 1.
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.
2010/04/18Yichun Measurements of identified hadron production at high p T in p+p and Au+Au collisions at RHIC-STAR 许依春 (Yichun Xu)
1 Probing dense matter at extremely high temperature Rudolph C. Hwa University of Oregon Jiao Tong University, Shanghai, China April 20, 2009.
Heavy Quark Energy Loss with Twist Expansion Approach Ben-Wei Zhang Institute of Particle Physics Central China Normal Univeristy CCAST, Beijing --- Augest.
High p T results from PHENIX Carla M Vale Brookhaven National Laboratory for the PHENIX Collaboration June
Kirill Filimonov, ISMD 2002, Alushta 1 Kirill Filimonov Lawrence Berkeley National Laboratory Anisotropy and high p T hadrons in Au+Au collisions at RHIC.
Enke Wang (Institute of Particle Physics, Huazhong Normal University) I. Introduction II. Ineraction Potential with Flow III.Flow Effects on Light Quark.
The STAR Experiment Texas A&M University A. M. Hamed for the STAR collaboration 1 Quark Matter 2009 Knoxville, TN.
Enke Wang (Institute of Particle Physics, Huazhong Normal University) I.Jet Quenching in QCD-based Model II.Jet Quenching in High-Twist pQCD III.Jet Tomography.
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.
High-pt phenomena at RHIC Primordial QCD Matter in LHC Era: Implications of LHC Results on the Early Universe Cairo, Egypt 4-8th December, 2011 Ahmed M.
Toward a  +Jet Measurement in STAR Saskia Mioduszewski, for the STAR Collaboration Texas A&M University 1.
Jet Quenching of Massive Quark in Nuclear Medium Ben-Wei Zhang Institute of Particle Physics Central China Normal Univeristy ICHEP, Beijing --- Augest.
Recontres de Moriond, March
Status and Implications of PID measurements at high pT
Modification of Fragmentation Function in Strong Interacting Medium
Comments on RHIC Results
QGP at RHIC: Seen through Modified Jet Fragmentation
of Hadronization in Nuclei
Cronin Effect of  K p from d+Au Collisions at 200 GeV
Jet-photon conversion with energy loss in Heavy Ion Collisions
张汉中 Institute of Particle Physics, Central China Normal University,
Modified Fragmentation Function in Strong Interaction Matter
Jet Quenching Effects of High Energy A+A Collisions in RHIC
Presentation transcript:

1 A NLO Analysis on Fragility of Dihadron Tomography in High-Energy Nuclear Collisions Enke Wang Institute of Particle Physics, Central China Normal University Collaborator: Hanzhong Zhang (CCNU) Joseph. F. Owens (Florida) Xin-Nian Wang (LBNL) PRL 98 (2007) (nucl-th/ )

2 Outline Introduction Dihadron Production in NLO pQCD Nuclear Modification Factor of Hadron- trigged Fragmentation Function Summary

3 Hard-scattering between partons in pp. Fragmentation of partons produce back-to-back jets of hadrons. Jets are clustered in angle and rich in high-pt particles. Jets produced in AA traverse and interact with the medium, lose energy and thus carry information of the medium. I. Introduction q q leading particle leading particle p-p collision q q Leading particle suppressed leading particle suppressed A-A collision Jet Quenching

4 P T dependence of sensitive to energy dependence of dE/dx Nuclear Modification Factor: E. Wang, X.-N. Wang, Phys. Rev. C 64(2001) Shadowing Effect No Energy Loss Energy Loss Leading Particle Suppression No Medium Effect Medium Effect

5 hadrons q q leading particle leading particle well calibrated: can be calculated by pQCD. q q hadrons Au+Au AA over binary-scaled pp p T trig >4 GeV/c, 2<p T assoc <4 GeV/c away-side particles suppressed at high pT leading particle suppressed Experimental Observation of Jet Quenching

6 Monojet quenching? Surface Emission In surface emission R AA depend on the thickness of the outer corona which varies very slowly with the initial gluon density Motivation: R AA from single hadron spectra is insensitive to the initial gluon density What is the sensitive probe to initial gluon density ? outer corona

7 II. Dihadron Production in NLO pQCD

8 Average parton energy loss in medium at formation time: Energy loss parameter proportional to the initial gluon density Parameterization of Energy Loss Enke Wang and Xin-Nian Wang, PRL87(2001)142301

9 Jet quenching in 2→2 processes LO analysis of jet quenching in AA 2→2 processes (tree level) A factor K=1.5-2 was put by hand to account for higher order corrections

10 Jet quenching in 2→3 processes 2→3 processes (tree level) NLO (Next to Leading Order ) corrections: One-loop corrections J. Owens, PRD65 (2002) ; B.W. Harris and J. Owens, PRD65 (2002)

11 p-p data at 200GeV are used to fix scales, Single hadron production in p+p

12 Jet Quenching effects lead to the modification of FF Modified Fragmentation Function in A+A KKP (X. -N. Wang, PRC70(2004)031901) averaged scattering number (opacity)

13 Single hadron production in Au+Au Single hadron spectra and R AA at different (initial gluon density)

14 Fit dAu data by using pp result to fix scales: Invariant mass: d+Au (no jet quenching): Dihadron Production in Au+Au Hadron-triggered fragmentation function

15 If no jet quen- ching, Centrality Dependence of D AA

16 III. Nuclear Modification Factor of Hadron-trigged Fragmentation Function

17 y x Single hadron Color strength = single hadron yield from partons in the square parton jet emission surface completely suppressed Surface Emission of Single Hadron Production corona thickness

18 partonic di-jet tangential y x triggered hadron associated hadron Color strength = dihadron yield from partons in the square punch-through jets 25% left Surface Emission + Punch-through jet in Dihadron Production

19 Nuclear Modification Factor of Hadron-trigged Fragmentation Function

20 If no jet quenching PRL95(2005) Centrality Dependence of I AA

21 Sensitivity of I AA to Initial Gluon Density reach minima, It provide convincing evidence for jet quenching description At LHC energy dihadron spectra have more contribution from dijet with higher initial energy, they are less suppressed than at RHIC energy, R AA become very flat (insensitive) with initial gluon density.

22 Because of the stronger quenching effects, the single hadron is dominated by vertical surface emission; the dihadron is from tangential surface emission + punch- through jets. The dihadron is more sensitive to the initial gluon density than the single hadron. When becomes insensitive in higher energy A+A collision, is a sensitive probe of dense matter. -fit to both single and dihadron spectra can be achieved with a narrow range of the energy loss parameter at RHIC energy, it provide convincing evidence for the jet quenching description. 1) 2) 3) VI. Summary

23 Thank you for your attention!

24