Jet-like correlations

 

A jet is a spray of hadrons produced by the “hard” scattering of a parton (quark or gluon). A hard scattering is one in which a large amount of energy is transferred between partons.

Hard scatterings occur early in a heavy-ion collision, allowing the scattered partons to act as probes of the medium created in these collisions.

The modifications of jets measured in Au+Au collisions compared to p+p collisions is interpreted to be an effect of the large densities in Au+Au collisions.  Such modifications have been measured in a variety of observables. 

 
  - Suppression of hadrons measured at high transverse momentum (pT)

  - Suppression of the away-side jet measured in 2-particle correlations, when selecting a high pT trigger particle
 
 
Ongoing analyses in this Physics Working Group focus on correlations measured between particles to further understand jet modifications in the medium produced in Au+Au collisions.  Such analyses include:
  - Untriggered 2-particle correlation measurements in 2 dimensions
  - Particle-identified particle correlations
  - 2+1 correlation measurements
  - Direct-photon-triggered correlations
  - Studies of the long range correlation in pseudorapidity observed in central Au+Au collisions
  - Full jet reconstruction
  - High pT single-particle hadron measurements at lower beam energies

 

Event Structure

Event structure focus group Pages

EStruct Home Page

Welcome to the STAR Event Structure Home Page!

Some of the methods commonly used in EStruct are described in the Tutorials (public).  Conference and seminar talks are linked from Talks (public) and publications are found Publications (public).  To see our work in progress visit You do not have access to view this node (internal).

 

Publications

 

Links to the papers in public

Publications

Two-particle correlations on transverse momentum and minijet dissipation in Au-Au collisions at $\sqrt{s_{NN}} = 130$ GeV
J. Phys. G 34 (2007) 799, and nucl-ex/0408012

The energy dependence of $p_{\rm t}$ angular correlations inferred from mean-$p_{\rm t}$ fluctuation scale dependence in heavy ion collisions at the SPS and RHIC
J. Phys. G 34 (2007) 451, and nucl-ex/0605021

The multiplicity dependence of inclusive pt spectra from p-p collisions at $\sqrt{s}$ = 200 GeV
Phys. Rev. D 74, 032006 (2006), and nucl-ex/0606028

Transverse-momentum pt correlations on momentum subspace (eta,phi) from mean-pt fluct uations in Au-Au collisions at 200 GeV
J. Phys. G 32 (2006) L37, and nucl-ex/0509030

Minijet deformation and charge-independent two-particle correlations on momentum subspace $(\eta,\phi)$ in Au-Au collisions at $\sqrt{s_{NN}}$ = 130 GeV
Phys. Rev. C 73 (2006) 064907, and nucl-ex/0411003

Hadronization geometry and charge-dependent two-particle correlations on momentum subspace ($\eta,\phi$) in Au-Au collisions at $\sqrt{s_{NN}} = 130$ GeV
Phys. Let. B 634 (2006) 347, and nucl-ex/0406035

Event-wise fluctuations in Au-Au collisions at sqrt(s[sub NN])=130 GeV
Phys. Rev. C 71 (2005) 064906, and nucl-ex/0308033

Transverse-momentum dependent modification of dynamic texture in central Au+Au collisions at sqrt(sNN ) = 200 GeV
Phys. Rev. C 71 (2005) 031901(R), and nucl-ex/0407001
 

From ES PWG Group members

Publications

Azimuth quadrupole component spectra on transverse rapidity y[sub t] for identified hadrons from Au-Au collisions at sqrt(s[sub NN]) = 200 GeV by T. A. Trainor
Phys. Rev. C 78, 064908 (2008)

Autocorrelations from fluctuation scale dependence by inversion by T. A. Trainor, R. J. Porter and D. J . Prindle
J. Phys. G 31 809-824, and hep-ph/0410182

Transverse-momentum $p_t$ correlations from mean-$p_{t}$ fluctuation scale dependence in Hijing-1.37-simulated Au-Au collisions at $\sqrt{s_{NN}} = $ 200 GeV by Qingjun Liu, Duncan J. Prindle, Thomas A. Trainor
Phys. Let. B 632 197, and hep-ph/0410180

Extrapolating parton fragmentation to low $Q^2$ in $e^+$-$e^-$ collisions by T. A. Trainor and D. Kettler
Phys. Rev. D 74, 034012 (2006), and hep-ph/0606249
 

Proceedings

Low-Q^2 partons in p-p and Au-Au collisions at XXXV International Symposium on Multiparticle Dynamics 2005 (ISMD2005) by T. A. Trainor

Transverse momentum correlations in relativistic nuclear collisions invited talk at Correlations and Fluctuations in Relativistic Nuclear Collisions Workshop (MIT, 2005) by T. A. Trainor

Probing the bulk medium in relativistic heavy ion collisions using two-particle correlations invited talk at Correlations and Fluctuations in Relativistic Nuclear Collisions Workshop (MIT, 2005) by R. L. Ray

The equivalence of fluctuation scale dependence and autocorrelations invited talk at Correlations and Fluctuations in Relativistic Nuclear Collisions Workshop (MIT, 2005) by D. J. Prindle and T. A. Trainor

Correlations from p-p collisions at sqrt(s) = 200 GeV invited talk at Correlations and Fluctuations in Relativistic Nuclear Collisions Workshop (MIT, 2005) by R. J. Porter and T. A. Trainor

Correlation structure of STAR events plenary talk at the International Conference on Contemporary Issues in Nuclear and Particle Physics (CINPP 2005) by Mikhail Kopytine

Correlations in STAR: interferometry and event structure plenary talk at the 5th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP-2005) by Mikhail Kopytine

"Event Structure at RHIC from p-p to Au-Au," at the 20th Winter Workshop on Nuclear Dynamics (2004) by Tom Trainor (hep-ph/0406116)

"Soft and hard components of two-particle distributions on (yt,eta,phi) from p-p collisions at sqrt(s)=200 GeV" at QM2004 by R.J. Porter, T.A. Trainor

Long range hadron density fluctuations at soft pT in Au+Au collisions at RHIC invited talk at Xth International Wokshop on Multiparticle Production (Correlation and Flucutations in QCD) by Mikhail Kopytine

Correlations, Fluctuations, and Flow Measurements from the STAR Experiment at Quark Matter 2002 by Lanny Ray


Preprints

A power-law description of heavy-ion collision centrality by Thomas A. Trainor and Duncan J. Prindle (hep-p h/0411217)

Extrapolating parton fragmentation to low Q^2 in e+e- collisions by Thomas A. Trainor and David T. Kettler (hep-ph/0606249)

What Does the Balance Function Measure? by Thomas A. Trainor (hep-ph/0301122)

Jet quenching and event-wise mean-pt fluctuations in Au-Au collisions at sqrt-sNN = 200 GeV in Hijing-1.37 by Qingjun Liu, Thomas A. Trainor (hep-ph/0301214)

Event-by-Event Analysis and the Central Limit Theorem by T.A. Trainor (hep-ph/000114)

Pion Lattices in HI Transverse Phase Space and Sudden Traversal of the QCD Phase Boundary by T.A. Trainor (hep-ph/0005176)

Jet Correlations and Scale-Local Measures by T.A. Trainor and J.G. Reid

Probing small length scales in heavy-ion collisions with event-by-event correlation analysis by T.A. Trainor (hep-ph/0004258)
 

Theses

M. Daugherity

A. Ishihara(ps)

J.G. Reid

Talks

Presentations

2009

DNP: Hawaii - Lanny Ray
DPF: Detroit - Chanaka De Silva
Ultra-Relativistic Nucleus-Nucleus Collisions: Knoxville - Duncan Prindle

2008

Tamura Symposium: Austin - Lanny Ray
DNP: Oakland - Duncan Prindle
DNP: Oakland - Lanny Ray
Workshop for young scientists: Ultra-Relativistic Nucleus-nucleus collisions: Estes Park, CO - David Kettler
Users meeting: Upton, NY - Tom Trainor
Winter Workshop: South Padre, TX - Lanny Ray
QM08: Jaipur, India - Michael Daugherity

General in 2006

Spring APS Meeting - Lanny Ray (ppt)
Spring APS Meeting - Michael Daugherity (ppt)

Quark Matter 05

Bulk-medium Properties in Relativistic Nuclear Collision - Duncan Prindle
Dissipation and Fragmentation of Low-Q^2 scattered partons at RHIC - Lanny Ray (ppt)
Two-particle Correlations from p-p Collisions at 200 GeV - Tom Trainor

General in 2005

ISMD 2005 - Tom Trainor
MIT Workshop on Correlations and Fluctuations - Jeff Porter
MIT Workshop - Duncan Prindle
MIT Workshop - Lanny Ray (ppt)
MIT Workshop - Tom Trainor
RHIC-AGS User's Meeting, June 2005 - Lanny Ray
RHIC-AGS User's Meeting, June 2005 - Tom Trainor

DNP meeting 04, Chicago

Lanny Ray
Michael Daugherity

General in 2004

Physics colloquium at Rice U. - Lanny Ray (Oct)
Nuclear physics seminar at BNL - Mikhail Kopytine (Sept)
ISMD 2004 - Jeff Porter
GSI Workshop, Skopelos, Greece - Tom Trainor
RHIC-AGS User's Meeting, May 2004 - Tom Trainor
20th Winter Workshop on Nuclear Dynamics, Jamaica, - Tom Trainor

DNP meeting 04, Chicago

Daugherity
Lanny Ray

General in 2004

Physics colloquium at Rice U. - Lanny Ray (Oct)
Nuclear physics seminar at BNL - Mikhail Kopytine (Sept)
ISMD 2004 - Jeff Porter
GSI Workshop, Skopelos, Greece - Tom Trainor
RHIC-AGS User's Meeting, May 2004 - Tom Trainor
20th Winter Workshop on Nuclear Dynamics, Jamaica, - Tom Trainor

Quark Matter 04

Porter
Lanny Ray

DNP meeting 03, Tucson

Aya Ishihara
Porter
Lanny Ray

General in 03

Talk given at Ohio State U. by Lanny Ray (ppt)

Tutorials

Event Structure Tutorials


This page contains tutorials written to document and explain Event Structure analysis techniques and results.

 

Tutorial Title Files
Tutorial 1
Understanding charge independent correlations on eta1-eta2 versus phi1-phi2 for proton-proton di-jet events ppt | pdf
Tutorial 2
 Measuring Histograms of the Number of Pairs of Particles, Constructing Ratios of Histograms, and the relationship to Correlations – Part 1 ppt | pdf
Tutorial 3
 Measuring Histograms of the Number of Pairs of Particles, Constructing Ratios of Histograms, and the relationship to Correlations – Part 2 ppt | pdf
Tutorial 4
 Relating Fluctuations and Correlations – Part 1 ppt | pdf

 

Tutorials by Lanny Ray, ray@physics.utexas.edu

 

HI jet finding

The Heavy Ion jet finding is a cross PWG discusison group and relates to the jet-like correlation PWG.

Updates can be found at the wiki-pages: http://rnc.lbl.gov/wiki/index.php/STAR_Jet_Reconstruction_in_Heavy_Ion_Collisions 

This activity group is lead by Joern Putschke.

High pT

High Pt is a focus activity group of Jet-like correlations PWG

 For further details see the protected area: www.star.bnl.gov/protected/jetcorr/

JetCorr Data QA

The contents of this page include dataset QA and run and tower selections and corresponding discussions shared by JetCorr PWG.

Data-

  • Run6 pp
    • Bad Run list
    • Bad Tower list
  • Run7 AuAu (dataset QA plots will be linked here in the near future)
    • Bad Run list
    • Bad Tower list
  • Run11 AuAu (dataset QA plots will be linked here in the near future)
    • Bad Run list
    • Bad Tower list
  • Run12 pp P12id  (dataset QA plots will be linked here in the near future)
  • Run14 AuAu P18ih
  • Run15 pAu P16id (dataset QA link will be linked here in the near future)

Simulations and Embedding -

Tracking Efficiencies -
Run14 AuAu /star/u/elayavalli/WORK/ANALYSIS/Run14TrackingEfficiency/Run14_AuAu_200_tracking_efficiency_and_momentum_smearing_dca_3p0(1p0, 2p0)_nhit_20(15)_nhitfrac_0p52.root
The histograms you need are
hTrack_(species - pion, kaon, proton)_Efficiency_pTEta_final_centbin#_lumibin# where centbin goes from 0 - 0-5% to 15 - 75-80%  and lumibin 0 - 0-10kHz and 9 - 90-100kHz - they are averaged for particle/anti-particle.
there are also track resolution histograms appropriately named for each species
the plot_eff.C macro produces these files and also draw some plots so you can also look at the naming there as well.

Run14 AuAu P18ih

  • In P18ih, the tracking issues reported in previous productions (P17id, P18if) of Run14 Au+Au data are fixed. The corresponding discussions can be found in Daniel Nemes's presentation on 3 May, 2019 (link). 
  • Primary tracks in this production (P18ih) were reconstructed without HFT hits, while P16id production included HFT hits for the primary track reconstruction. 
  • Run14 AuAu P18ih run list
  • Run14 AuAu P18ih tower list