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.

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Presentation transcript:

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

STAR 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

STAR 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)

STAR 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) <p T (trig)<15 GeV/c

STAR 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 ‘ % STAR preliminary 3<p T trig <4 GeV/c 1.3<p T assoc <1.8

STAR 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) Phys.Lett. B639 (2006) 38

STAR 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”

STAR 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

STAR 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

STAR 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

STAR 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

STAR 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

STAR 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  

STAR 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) % 10-20% 20-30% 30-40% Note: this is the correction function for T1A1

STAR 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 % 10-20% 20-30% 30-40%

STAR 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

STAR 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

STAR 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

STAR 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

STAR 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

STAR 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

STAR 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