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Outline: -1) New insights to good old suppression observables -2) New insights to 2-p correlations Gamma-Jet Hadron Corrs. Energy Loss And Hadron Correlations in PHENIX. Justin Frantz Ohio University For PHENIX. The Worn T-Shirt. RHIC Hard Probes Summarized The old comfy T… - PowerPoint PPT Presentation
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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
5/29/2012
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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
10 5/29/2012
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
5/29/2012(CNM)V
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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12
345
67
8
fJet , fTrig.
56
78
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!
23 5/29/2012
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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
5/29/2012
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Nice consistency RHIC vs RHIC? Qualitatively similar Same conclusions
STAR Prelim
low zlow z
5/29/2012
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?)
5/29/2012
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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
v:11
02.1
957v
2
<1-x
h = (p
T1-p
T2)/p
T1>
<
RHICLHC CMS WWND11
J
Jh
h
hJ A
Axxx
EEEEA
-
-
-
11ˆ
ˆ1ˆ1
2121
ˆ p Ta / ˆ p Tt ˆ x h
lead hadron trigger pT (GeV/c)
5/29/2012
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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 ?”
<z>
5/29/2012
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Hello
5/29/2012
36 5/29/2012
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sPHENIX
5/29/2012
38 5/29/2012
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