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Energy Loss And Hadron Correlations in PHENIX Justin Frantz Ohio University For PHENIX 5/29/2012 1 Outline: -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 2

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The LHC Era: Towards Formalwear for HI Hard Probes Good tailoring: Cant 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 3

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New Bells and Whistles for the old T New (good-old) RAAs give new insight!!! 5/29/2012 4

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s NN dependence of energy loss Filling in low Q2 5 Large Mid p T Suppression R AA @ 39 GeV unlike big Cronin-like GLV R AA at 62 GeV approaches 200 GeV level at high p T RHIC R AA tuning overshoots LHC Suppression PRL101, 232301 5/29/2012 This is what weve been waiting for: work underway but can simple perturbative models fit the details? Vertesi talk yesterday

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Direct Photon Baseline 5/29/2012 6 Shadowing CNM effect not large? Baldo Sahlmueller Poster this afternoon see him for orders Continually making updates to 200 GeV R AA 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 R AA 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 Communitys 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 7 Cu+Cu 200 GeV We need a Cu+Cu T Shirt!!!!! (X+X?!!!) Direct RHIC!!!

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Other updates - why? full species systematics Similar motivation for full exploration of various hadronic flavors High p T from fragmentation region Geometry/Density/CNM Recent Strangeness results 5/29/2012 8

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9 An even wider body of data should be considerede.g. other geometries PHENIX is continually refining Cu+Cu Enter Cu+Au @ RHIC Conclusion 1 In particular CNM effects

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Cold Nuclear Matter Effects You cant understand the whole outfit till you understand whats hiding underneath Important for interpretation of HI data Measure Cold Nuclear Matter (CNM) effects in d+Au collisions Versatility RHIC 10 5/29/2012

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Shadowed Jets in d +Au? 11 5/29/2012 Jet R cp in central d+Au modified - consistent with 0 R cp -Shape/ Magnitude Inconsistent w/ EPS09 Not R dA ? 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 12 Hints of a CNM FINAL state effect? PHENIX Preliminary

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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 13 (CNM) V See Read talk today, Frawley and Tarafdar talks tomorrow

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5/29/2012 14 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 v n measurements jet-medium interactions? Relating 2-particle correlations to Reco Jets Gamma-Jet Hadrons vs Jet-Hadrons Corrs. 5/29/2012 15 Reco Jets?2p?

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A word about v n Input for 2-p: gap no jet 2p w/ jet Focused on characterizing bulk v n esp n != 2 -- new larger Run10 statistics data analysis underway Next: focus on high p T behavior @ RHIC (non-0 v 3 ?) Also Heavy Flavor w/ new electron capabilities (62 GeV) Constrain high p T v 2 (v n ) path length analysis: RHIC vs LHC T. Todoraki talk yesterday 5/29/2012 16 S. Tarafdar talk Th. HBD!!!

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2-p correlation w/jet (small ) 17 Using new flow bkg model, and ZYAM for comparison Central: w/ v 3 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

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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? 18 200GeV Au+Au 0-20%, inc. -had. 5/29/2012 Take Home: Still working to test jet-medium w/ some definiteness

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n Dependence in 2-p One important test of hydro flow picture is can it explain 2-p trigger reaction plane dependence ( 2 ) Reminder Cone/Shoulder was independent of - 2 : confirmed by measured lack of 2 3 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? 19 1 2 3 4 5 6 7 8 Jet, Trig. 5 6 7 8 1 2 3 4 22 3 ! 5/29/2012

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3 Dependence Correlation Functions + Bkg Model w/ 3 mixing, v 3 effect removed. no 3 dependence? 20 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 21

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Gamma-Hadron Correlations Awayside 2-p h yield plotted vs z T Suppression at low (high z) High , low z Enhancement? 5/29/2012 22 ln z T

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Increase, maybe Enhancement Increase at high (< ~3 sig) Hint of enhancement I AA > 1 ( < 1.3 ) 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 p T track >= 4 GeV/c Its a Hard/Soft Division, not scaling w/ z consistent w/ pQCD theory? CMS-PAS-HIN-11-004 5/29/2012 24

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Nice consistency RHIC vs RHIC? Qualitatively similar Same conclusions STAR Prelim low z 5/29/2012 25 Take Home: Two Independent RHIC results indicate

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5/29/2012 26 FF is likely indeed modified, but only below a scale of ~3 GeV Conclusion 3

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New styles RHIC exerts its flexibility 5/29/2012 27

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Very Interesting Things Currently underway @ RHIC! VTX dataset in Au+Au 2011 and 2012 p+p ! FVTX Commisioning 2012 R AA v 2 of c, b separately 28 - Data: Au+Au@200 GeV, 20112012 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 v n U+U J/Psi Cu+Au J/Psi 5/29/2012 29 Fast track analysis on QM timescale!

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Conclusions An even wider body of data should be considerede.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 30

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SPHENIX 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 31

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Backup 5/29/2012 32

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Converting btw 2-p & Reco Jet Results Using PHENIX fitting framework one can fit z x E distribution to get is just an involution of A J ! PHENIX Prelim PHENIX Data Fit Au+Au 200 GeV 0-20% p+p 200 GeV arXiv:1102.1957v2 < RHIC LHC CMS WWND11 lead hadron trigger p T (GeV/c) 5/29/2012 33

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Fractional Energy Loss RHIC/LHC CMS: E jet 2 > 50 UPDATED CMS DATA arXiv:1202.5022 S. Salur Monday talk QGP Bethe-Bloch ? 5/29/2012 34

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Hello 5/29/2012 35

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sPHENIX 5/29/2012 37

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