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Energy Loss And Hadron Correlations in PHENIX

Justin FrantzOhio UniversityFor PHENIX

5/29/2012Outline: -1) New insights to good old suppression observables -2) New insights to 2-p correlations Gamma-Jet Hadron Corrs

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The Worn T-Shirt RHIC Hard Probes Summarized The old comfy T… Data is self sufficient

Old conclusion: Radiative Eloss is ~all we need

Too worn?

5/29/2012

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The LHC Era: Towards Formalwear for HI Hard Probes… Good tailoring: Can’t Fit one part and not the

other Obviously complete picture over all sqrt(s) and jet

E Need complete picture over other knobs: e.g.

geometry!

5/29/2012

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New Bells and Whistles for the old TNew (good-old) RAA’s give new insight!!!

5/29/2012

sNN dependence of energy loss

Filling in low Q2

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Large Mid pT Suppression RAA @ 39 GeV unlike big Cronin-like GLV RAA at 62 GeV approaches 200 GeV level at high pT RHIC RAA tuning overshoots LHC Suppression

PRL101, 232301

5/29/2012

This is what we’ve been waiting for: work underway but can simple perturbative models fit the details?

Vertesi talk yesterday

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Direct Photon Baseline5/29/2012

“Shadowing”CNM effect not large?

Baldo Sahlmueller Poster this afternoon—see him for orders

Continually making updates to 200 GeV RAA’s Au+Au & Cu+Cu

Direct Photons Long standing issue w/ baseline updated!!! arXiv: 1205:5759 !!!

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Cu+Cu,… (Light)

Some evidence here too Peripheral Jet? More about that later… Also recent HF electron RAA in Cu+Cu Cu+Cu : Light Ion test (singular)

different interplay of cold and hot effects different geometry vs density (e.g. “core-corona”)

Just one? Cu+Au… Community’s job not be finished until systematics known across several ion sizes

My point: in addition to fitting LHC Pb vs RHIC Au, Eloss models, (esp CNM parts) PHENIX Cu data could provide large dataset constraints that could already be breaking simplest standard/radiative picture

5/29/2012

Cu+Cu 200 GeV

We need a Cu+Cu T Shirt!!!!! (X+X?!!!)

Direct g

RHIC!!!

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Other updates - why?full species systematics

Similar motivation for full exploration of various hadronic flavors High pT from fragmentation region

Geometry/Density/CNM Recent Strangeness results

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An even wider body of data should be considered—e.g. other geometries PHENIX is

continually refining Cu+Cu

Enter Cu+Au @ RHIC

Conclusion 1

In particular CNM effects

Cold Nuclear Matter Effects You can’t understand the whole outfit

till you understand what’s hiding underneath…

Important for interpretation of HI data Measure Cold Nuclear Matter (CNM)

effects in d+Au collisions Versatility RHIC

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Shadowed Jets in d+Au?11 5/29/2012

Jet Rcp in central d+Au modified- consistent with p0 Rcp

-Shape/ Magnitude Inconsistent w/ EPS09 Not RdA? p+p ana being finalized

See Perepilitsa talk Thurs. for details

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CNM Jets vs Direct Photons

Cu+Cu Similar Story? (Caveat Uncertainties)

5/29/2012

Hints of a CNM FINAL state effect?

PHENIXPreliminary

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Much more: e.g. Heavy Flavor Heavy RAA note shape comparison btw data/theory d+A Substantial Initial State can explain? (Cu+Cu)

Result is currently being finalized. Study also w/ single mu? (First measurement y = 1.65)

See Read talk today, Frawley and Tarafdar talks tomorrow

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See Read talk today, Frawley and Tarafdar talks tomorrow

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CNM effects present in d+Au may need more complicated treatments to make definitive constraints about Eloss models

Conclusion 2

Frawley talk tomorrow discuss much more wrt Heavy Flavor, etc..

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A more detailed look at the design patterns: a status report

Two particle correlations vn measurements jet-medium interactions?

Relating 2-particle correlations to Reco Jets Gamma-Jet Hadrons vs Jet-Hadrons Corrs.

5/29/2012

Reco Jets? 2p?

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A word about vn Input for 2-p: h gap no jet 2p w/ jet Focused on characterizing bulk vn esp n != 2 -- new larger Run10

statistics data analysis underway Next: focus on high pT behavior @ RHIC (non-0 v3?) Also Heavy Flavor w/ new electron capabilities (62 GeV) Constrain… high pT v2 (vn) path length analysis: RHIC vs LHC

T. Todoraki talk yesterday

5/29/2012

S. Tarafdar talk Th.

HBD!!!

172-p correlation w/jet (small Dh) Using new flow bkg model, and ZYAM for comparison

Central: w/ v3 subtraction humps largely disappear On awayside pure suppression / periph still

something? On Nearside correlation is p+p like in shape? Both conclusions are still inconclusive since no v1

modulation is considered! TODO!

5/29/2012

w/ alternate ABS bkg Norm

Different choice of normalization Awayside shape conclusion same… But BIG PEDESTAL! Jet medium hiding underneath? Note: p+p is using ZYAM: TODO: REALLY TEST ABS

RELIABILITY! “Correlated Underlying Event “ medium modification?

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200GeV Au+Au0-20%, inc. g-had.

5/29/2012

Take Home: Still working to test jet-medium w/ some definiteness

Yn Dependence in 2-p One important test of hydro flow picture is can it

explain 2-p trigger “reaction plane” dependence (Y2) Reminder Cone/Shoulder was independent of f-Y2 : confirmed by measured lack of Y2 Y3 corr but w/ full v3,v4 subtraction? Being careful ana underway

But now another interesting question to ask: are jet correlations dependent on higher order event planes?

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fJet , fTrig.

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1234

fJet , fTrig.

Y2Y3 !

5/29/2012

Y3 Dependence Correlation Functions + Bkg Model

w/ Y3 mixing, v3 effect “removed”. no Y3 dependence?

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LOOK FOR FULLY SUBTRACTED RESULTS VERY SOON!

5/29/2012

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Fitting the WHOLE new Beast

Connecting 2-p results to jet reco observables

5/29/2012

Gamma-Hadron Correlations

Awayside 2-p g-h yield plotted vs zT

Suppression at low ξ (high z)

High ξ , low z Enhancement?

5/29/201222

zppT

Th

T

g x -ln zT

Increase, maybe Enhancement

Increase at high ξ (< ~3 σ sig)

Hint of enhancement IAA > 1 (< 1.3σ )

Currently trying to make this test quantitative significance w/ Run 10 QM12!

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CMS = no FF modification? CMS no frag modification ?… only above pT track >= 4 GeV/c It’s a Hard/Soft Division, not scaling w/ z consistent w/ pQCD

theory?CMS-PAS-HIN-11-004

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Nice consistency RHIC vs RHIC? Qualitatively similar Same conclusions

STAR Prelim

low zlow z

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Take Home: Two Independent RHIC results indicate…

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FF is likely indeed modified, but only below a scale of ~3 GeV

Conclusion 3

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New styles RHIC exerts it’s flexibility

5/29/2012

Very Interesting Things Currently underway @ RHIC!

VTX dataset in Au+Au 2011 and 2012 p+p ! FVTX Commisioning 2012 RAA v2 of c, b separately

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Data: Au+Au@200 GeV, 2011 2012 p+p @ 200 dataset!

5/29/2012

FVTX

Detector commissioning /p+p reference

went well

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“Exotic” Initial Collision Systems

U+U and Cu+Au Running On tape!

U+U vn

U+U J/Psi

Cu+Au J/Psi

5/29/2012

Fast track analysis on QM timescale!

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Conclusions An even wider body of data should be

considered—e.g. other geometries PHENIX is continually refining Cu+Cu Enter Cu+Au @ RHIC

CNM effects isolated in d+Au look non-trivial

Relating 2-p correlations to Eloss detailed way is just starting

Direct Photon –hadron correlations at RHIC consistent w/ Jet-h at RHIC show modification of FF below LHC kinematic cuts

5/29/2012

31SPHENIX Increase Acceptance!! MORE STATS!!!!! FIT JETS > R = 0.3!!!! Systematically study s / jet E dependence

From 2010 PHENIX Decadal Plan

Gunther Roland WWND12

Seto talk (Cole?)

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Backup

5/29/2012

33Converting btw 2-p & Reco Jet Results <xhat> Using PHENIX fitting framework

one can fit z ≈xE distribution to get

is just an involution of AJ ! PHENIX Prelim

PHENIX Data Fit

Au+Au 200 GeV 0-20%

p+p 200 GeV arXi

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Fractional Energy Loss RHIC/LHC

CMS: Ejet 2 > 50 UPDATED CMS DATA

arXiv:1202.5022 S. Salur Monday talk

“QGP Bethe-Bloch ?”

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Hello

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sPHENIX

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