Presentation is loading. Please wait.

Presentation is loading. Please wait.

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.

Published byRaymond Booker Modified over 8 years ago

Similar presentations

Presentation on theme: "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."— Presentation transcript:

1 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 with Aneta Iordanova, Olga Barannikova and Jeremy Callner

2 STAR 2 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Outline Motivation Evolution of jet-type correlation analyses Theoretical interpretation of data Data Analysis Results Energy loss in di-jet events Summary

3 STAR 3 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Motivation Evolution of Jet Correlations Signature two-particle correlation result: Disappearance of the away side jet in central Au+Au collisions Evidence for strongly interacting medium Effect vanishes in peripheral/d+Au collisions 4<p T trig <6 GeV/c 2<p T assoc <p T trig PRL 91 (2003) 072304

4 STAR 4 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Motivation Evolution of Jet Correlations Two high-p T triggers Reappearance of the away-side jet For central Au+Au collisions First observation of di-jets New analysis exploits this observation PRL 97 (2006) 162301 8<p T (trig)<15 GeV/c

5 STAR 5 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Motivation Evolution of Jet Correlations One high-p T, one low-p T trigger Reappearance of the away-side jet For central Au+Au collisions Distribution is spread in  (compared to near- side) Double-hump structure hints at additional physics phenomena STAR, M. v Leeuwen, Hangzhou ‘06 0-12% STAR preliminary 3<p T trig <4 GeV/c 1.3<p T assoc <1.8

6 STAR 6 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Motivation Understanding the jet correlations To address the mechanisms of energy loss in the hot QCD medium Mach cone (Stoecker, Casalderrey- Solana, Shuryak, Teaney) Cherenkov gluon radiation (Koch, Majumder, Wang) Jet quenching & fragmentation (Vitev) Parton multiple scattering (Chiu, Hwa) Color wake (Ruppert, Muller) Flow-induced deflection (Armesto, Salgado, Wiedemann) Use di-jets to explore how these effects happen 4<p T trig <6 GeV/c 2<p T assoc <p T trig PRL 91 (2003) 072304 Phys.Lett. B639 (2006) 38

7 STAR 7 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Energy Loss Mechanisms Jet Quenching Dissipation jet energy when propagating through the medium Mach-Cone Could result in double-hump structure on away-side Mono-jet Single jet on near-side Excess on away side due to momentum conservation “near-side” “away-side”

8 STAR 8 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Experimental Tools Experimental tools: Jet Tagging Using highest high-p T particle as a proxy Correlations Triggers and associates For di-jets: expect near and away side jet

9 STAR 9 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Data analysis Analysis Technique Aim of this analysis is to “pin” the jet axis Assuming di-jets Only select events with high-p T particles back-to-back in  Correlate all particles with this axis associates primary trigger (T1) “jet-axis” trigger (T2) Signal sit atop of a largely uncorrelated background

10 STAR 10 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Modeled Analysis: Mach-cone scenario Simulation of one scenario, mach-cone New method should be sensitive to this and other effects *Simulations by Martin Andrews (UIC) Unmodified Jet*   Simulation   Data   Modified Jet* Simulation

11 STAR 11 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Data analysis Forming a two-particle correlation Form the correlation with primary trigger (T1) and jet-axis trigger (T2) Central 0-10% T1 – p T >5GeV/c T2 – p T >4GeV/c T1: p T >5GeV/c T2: p T >4GeV/c A: p T >1.5GeV/c Raw, uncorrected signal T1T2

12 STAR 12 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Data analysis Selecting di-jet events Require that the 2 highest p T particles are back-to-back in  Assume this defines the jet-axis T1: p T >5GeV/c T2: p T >4GeV/c A: p T >1.5GeV/c Raw, uncorrected signal T1T2

13 STAR 13 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Data analysis Correction: mixed event background Accounts for: pair acceptance triangular shape in  uncorrelated background particles not related to initial jet  

14 STAR 14 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Data analysis Correction: v 2 background Need to account for elliptic flow May inflate the near/away signal peak Relative to p+p or d+Au collisions Phys.Rev. C72 (2005) 014904 0 - 10% 10-20% 20-30% 30-40% Note: this is the correction function for T1A1

15 STAR 15 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School   Data analysis Final construction: 2+1 correlation Raw SignalBackground     Signal-Background   Flow Subtracted T1: p T >5GeV/c T2: p T >4GeV/c A: p T >1.5GeV/c 0 - 10% 10-20% 20-30% 30-40%

16 STAR 16 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Preliminary Results: Di-jets in Au+Au Collisions T1: p T >5GeV/c T2: p T >4GeV/c A: p T >1.5GeV/c Single triggerDi-jet trigger no modification on away-side Surface dominated? No energy loss for di-jets? One high-p T trigger (only) away-side modification Mono-jets? Energy loss for away-side jet? T1A1 T2A1

17 STAR 17 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Preliminary Results: Di-jets in Au+Au Collisions T1: p T >5GeV/c T2: p T >4GeV/c A: p T >1.5GeV/c Accounting for possible correlated background No modification on the away-side Signal + Background Estimated Background Signal T1T2 T2A1

18 STAR 18 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Preliminary Results: Di-jets in Au+Au Collisions Correlation of associates with: T1 (also requires a T2) T2 Detailed shape of near- and away-side is the same T1: p T >5GeV/c T2: p T >4GeV/c A: p T >1.5GeV/c T1A1_T2 T2A1

19 STAR 19 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Preliminary Results: Di-jets in Au+Au Collisions Clear evidence of no  modification Effect of the  -“ridge” observed with a single- trigger analysis also not apparent  projection  projection

20 STAR 20 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Preliminary Results: N bin systematics Number of triggers (per event per number of binary collisions) Single and double triggers behave as inclusives * 14 is an arbitrary constant for ease of comparison Number of triggers per event: T1, T2 × 14

21 STAR 21 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Preliminary Results: Volume vs. Surface If the triggers are tangential biased: expect a term related to the surface Volume ~ R 3 ~ N part Surface ~ R 2 ~ N part 2/3 Appear to be surface dominated d+Au Number of triggers per event: T1, T2 × 14

22 STAR 22 20-25 May 2007 Richard Hollis University of Illinois at Chicago The Berkeley School Summary New analysis of 2+1 correlations Events triggered with 2 high-p T particles Preliminary results show a di-jet structure with this technique, with no modification Number of triggers seems to point to surface emission of these di-jets

Download ppt "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."

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.
Multiparticle Correlations and Charged Jet Studies in p+p, d+Au, and Au+Au Collisions at  s NN =200 GeV. Michael L. Miller Yale University For the STAR.

Multiparticle Correlations and Charged Jet Studies in p+p, d+Au, and Au+Au Collisions at  s NN =200 GeV. Michael L. Miller Yale University For the STAR.
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.
Motivation One of the major findings at the Relativistic Heavy Ion Collider (RHIC) is the suppression of the highly energetic particles which raises the.

Motivation One of the major findings at the Relativistic Heavy Ion Collider (RHIC) is the suppression of the highly energetic particles which raises the.
Hydrodynamical Study of Jet Energy Loss Barbara Betz Institut für Theoretische Physik Johann Wolfgang Goethe-Universität Frankfurt am Main DPG - Frühjahrstagung.

Hydrodynamical Study of Jet Energy Loss Barbara Betz Institut für Theoretische Physik Johann Wolfgang Goethe-Universität Frankfurt am Main DPG - Frühjahrstagung.
1 Probing the medium with photons Outline: oMotivation oExperiment oResults oConclusion oIntroduction LBNL 21-05-07 Saskia Mioduszewski Ahmed Hamed.

1 Probing the medium with photons Outline: oMotivation oExperiment oResults oConclusion oIntroduction LBNL Saskia Mioduszewski Ahmed Hamed.
Relativistic Heavy-Ion Collisions: Recent Results from RHIC David Hardtke LBNL.

Relativistic Heavy-Ion Collisions: Recent Results from RHIC David Hardtke LBNL.
Jet Propagation and Mach-Cone Formation in (3+1)-dimensional Ideal Hydrodynamics Barbara Betz and Miklos Gyulassy, Jorge Noronha, Dirk Rischke, Giorgio.

Jet Propagation and Mach-Cone Formation in (3+1)-dimensional Ideal Hydrodynamics Barbara Betz and Miklos Gyulassy, Jorge Noronha, Dirk Rischke, Giorgio.
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.
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.
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.
Dependence of Ridge Formation on Trigger Azimuth Rudolph C. Hwa University of Oregon Ridge Workshop Brookhaven National Lab September 22, 2008.

Dependence of Ridge Formation on Trigger Azimuth Rudolph C. Hwa University of Oregon Ridge Workshop Brookhaven National Lab September 22, 2008.
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.
Feb 2007 Big Sky, Montana Nuclear Dynamics 2007 Conference Is There A Mach Cone? For the STAR Collaboration Claude Pruneau Motivations/Goals Expectations/Models.

Feb 2007 Big Sky, Montana Nuclear Dynamics 2007 Conference Is There A Mach Cone? For the STAR Collaboration Claude Pruneau Motivations/Goals Expectations/Models.

Similar presentations

Ads by Google