Energy Loss And Hadron Correlations in PHENIX Justin Frantz Ohio University For PHENIX 5/29/2012 1...
If you can't read please download the document
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
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
Slide 2
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
Slide 3
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
Slide 4
New Bells and Whistles for the old T New (good-old) RAAs give
new insight!!! 5/29/2012 4
Slide 5
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
Slide 6
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 !!!
Slide 7
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!!!
Slide 8
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
Slide 9
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
Slide 10
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
Slide 11
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
Slide 12
CNM Jets vs Direct Photons Cu+Cu Similar Story? (Caveat
Uncertainties) 5/29/2012 12 Hints of a CNM FINAL state effect?
PHENIX Preliminary
Slide 13
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
Slide 14
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..
Slide 15
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?
Slide 16
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!!!
Slide 17
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
Slide 18
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
Slide 19
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
Slide 20
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
Slide 21
Fitting the WHOLE new Beast Connecting 2-p results to jet reco
observables 5/29/2012 21
Slide 22
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
Slide 23
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
Slide 24
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
Slide 25
Nice consistency RHIC vs RHIC? Qualitatively similar Same
conclusions STAR Prelim low z 5/29/2012 25 Take Home: Two
Independent RHIC results indicate
Slide 26
5/29/2012 26 FF is likely indeed modified, but only below a
scale of ~3 GeV Conclusion 3
Slide 27
New styles RHIC exerts its flexibility 5/29/2012 27
Slide 28
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
Slide 29
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!
Slide 30
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
Slide 31
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
Slide 32
Backup 5/29/2012 32
Slide 33
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
Slide 34
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