Recent Results From RHIC Olga Evdokimova University of

Recent Results From RHIC Olga Evdokimova University of Illinois at Chicago Outline: ¢ ¢ ¢ l ¢ HI program at RHIC Data collection and Detector Setups Selected recent results Jets, jet-like correlations and medium properties Summary and outlook

Relativistic Heavy Ion Collider ¢ Design goal - studies of phase structure of nuclear matter PHOBOS RHIC PHENIX STAR BRAHMS l p U l AGS Counter-rotating ion beams Maximum center-of-mass energy: TANDEMS HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 200 Ge. V for Au+Au 500 Ge. V for pp 2 6/25/2013

A+A Data Collection l HI Program: QCD matter under Extreme Conditions STAR HEPFT 2013 l s. QGP Studies Eo. S, Eloss in QCD medium …. l Beam Energy Scan QCD critical point search, Onset of deconfinement, Chiral symmetry restoration … Olga Evdokimov University of Illinois at Chicago 3 6/25/2013

PHENIX Detector Central Arm Detectors Drift, Pad, Time-Extension Chambers RICH, EMCal l 2 arms 90º in l 0. 7 units of Muon Arms Detectors Mu. Tr, Mu. ID, MPC l 1. 2 < |η| < 2. 2(2. 4) l 3 < |η| < 4 Upgrade (HF physics): VTX, FVTX HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 4 6/25/2013

STAR Detector Time Of Flight(TOF) Time Projection Chamber (TPC) (-1 ≤ ≤ 1) EMC+EEMC+FMS (-1 ≤ ≤ 4) Muon Telescope Detector (MTD) 2013 DAQ 1000 Heavy Flavor Tracker (HFT) 2013+ BNL PAC, 21 - 22, 2010 HEPFT 2013 Olga Evdokimov University of Illinois at Chicago Forward GEM Tracker (FGT) 2011+ 5 6/25/2013

This Talk’s Focus in vacuum leading particle hadrons q l Angular correlations (with high p. T probes) ¡ Early stage (p. QCD) probes ¡ Interactions of created matter with passing particle l Jet quenching l Azimuthal anisotropy q hadrons in medium ¡ Long range correlations leading particle (suppressed ) hadrons l Control over cold matter effects via d+Au? q q l Initial vs. Final state effects? hadrons suppression HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 6 6/25/2013

What are the s. QGP signatures? PRL 96 (2006) 202301 l RAA – the first tool for jet quenching studies l Colorless probes check Ncoll scaling: Direct photons PRL 91 (2003) 072303 ¢ High p. T hadron suppression: l l l HEPFT 2013 Final state effect in Au+Au collisions Observation extends to all accessible p. T range High density opaque medium Olga Evdokimov University of Illinois at Chicago 7 6/25/2013

What are the s. QGP Signatures? STAR: PRL 95, 122301 (2005) Partonic collectivity l Deconfinement l PHENIX: PRL 98, 162301 (2007) In multiple measurements, example – v 2 x l Strong anisotropy in the final state, including W and f! l Low p. T - mass ordering, consistency with hydrodynamic calculations l Higher p. T – NCQ scaling HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 8 6/25/2013

Jet Quenching STAR: PRL 90, 082302 (2003) PHENIX PRC 78, 014901 (2008) l The discovery plot: disappearance of away side jet l Associated p. T dependence: ¡ Recovering the away side ¡ Development of “double-humps” or “shoulders” HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 9 6/25/2013

Correlations in 2 D – The Ridge 3 < p. T, trigger < 4 Ge. V/c STAR: PRC 80 (2009) 064912 pt, assoc. > 2 Ge. V/c d+Au central Au+Au central From not-so-recent results: l l Ridge correlated with jet direction Approximately independent of D and trigger p. T Extends to acceptance boundary and to the highest trigger p. T measured Production mechanisms for jet and ridge differ Until recent, the ridge open question: manifestation of the jet quenching or coincidental nuisance? HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 10 6/25/2013

Azimuthal Anisotropy Early sketch: zz Reaction plane (YR) yy Motivation for “vn fit” : x x l Cross-talk between data and theory transport model predictions Glauber-based picture: HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 11 6/25/2013

Long Range Correlation – Fourier Fits cos(Df) cos(2 Df) cos(3 Df) ¢ +… ¢ Comparison with flow: ¢ Long range correlations near- and away from the trigger could be simultaneously described via higher order vn terms vn fit results are consistent with flow expectations STAR preliminary Preliminary STAR Alver and Roland, PHENIX: PRC 81, 054905 (2010) QM 2012 HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 12 6/25/2013

All in Hydro? 200 Ge. V Au+Au collisions Excellent agreement for PHENIX and STAR: v 3 ~ v 2 in central events v 3 and higher harmonics ~ centrality independent origin in fluctuations Centrality and p. T dependences of vn well reproduced by hydro calculations Precision measurements constrain /s What’s the catch? Unresolved issue of fast thermalization Long range correlations probe ~10 -24 s PRL 110, 012302 (2013) HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 13 6/25/2013

Hot Topic: d. A (p. A) Collisions l Renewed attention to the “reference” ¡ Understanding cold nuclear effects ¡ Understanding initial state in HI collisions CMS PLB 718, 795 (2013) High multiplicity pp collisions HEPFT 2013 High multiplicity p. Pb collisions Olga Evdokimov University of Illinois at Chicago 14 6/25/2013

PHENIX: d+Au Correlations A. Sickles MIT p. A Workshop Ridge in high multiplicity d+Au collisions! HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 15 6/25/2013

STAR: d+Au Correlations S inary m i l e r TAR P 0. 15 < p. Ttrig < 3 Ge. V/c 1 < p. Tassoc < 2 Ge. V/c inary m i l e r AR P ST TPC mult. | |<1 as centrality STAR Preliminary ZYAM-ed F. Wang RBRC Workshop Ridge in high multiplicity d+Au collisions? HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 16 6/25/2013

What is Ridge in d+Au? PHENIX, ar. Xiv: 1303. 1794 Bozek, PRC 85 (2012) l d+Au ridge consistent with hydro predictions? l v 2/v 3 depend strongly on initial state HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 17 6/25/2013

Initial vs. Final State Effects l Are we back to the drawing board? Dusling and Venugopalan, ar. Xiv: 1302. 7018 l CGC/Glasma: Weak coupling, high intensity color fields ¡ Long-range correlations – induced by color fluctuations ¡ High multiplicity events probe rare gluon configurations l Describes multiplicity in p. A, d. A, AA l Describes vn for different AA centralities at RHIC and LHC l A factor of 2 below data on vn in p. Pb(? ) HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 18 6/25/2013

Summary l PHENIX and STAR Au+Au results: ¡ Quantitative studies of jet quenching ¡ Relevance of partonic Do. F ¡ Higher order anisotropies from initial state fluctuations l Ridge correlations in d+Au Common trend for different systems? (needs resolution between the experiments) l Systematic measurements of v 2/v 3 p. T, energy and centrality dependence should address the relevance of initial and/or final state effects HEPFT 2013 Olga Evdokimov University of Illinois at Chicago 19 6/25/2013