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Summary of Recent PHENIX Results

Summary of Recent PHENIX Results. J. Lajoie , Iowa State University. Outline. d +Au and Cold Nuclear Matter Geometry studies with Cu+Au Spin and nucleon structure.

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Summary of Recent PHENIX Results

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  1. Summary of Recent PHENIX Results J. Lajoie, Iowa State University 2013 RHIC & AGS Annual Users' Meeting

  2. Outline • d+Au and Cold Nuclear Matter • Geometry studies with Cu+Au • Spin and nucleon structure We have entered a detailed exploration phase at RHIC where we are now able to begin separating fundamental QCD from non-ideal effects (CNM, geometry,…). 2013 RHIC & AGS Annual Users' Meeting

  3. The Devil’s in the Details 2013 RHIC & AGS Annual Users' Meeting

  4. The Baryon Anomaly (Au+Au) PRL 91, 172301 (2003), PRC 69, 034909 (2004) proton/pion antiproton/pion Excess (anti) baryons compared to pions at moderate pT (2-5 GeV/c). Does not look like vacuum jet fragmentation. 2013 RHIC & AGS Annual Users' Meeting

  5. The Baryon Anomaly in d+Au? The start of the “Baryon Anomaly” is present in CNM – not a QGP effect? Or is it? Challenges explanations that require a high parton density. Central d+Au ratios look a lot like peripheral Au+Au ratios. Clear enhancement of baryons as a function of centrality. PHENIX arXiv:1304.3410v1 2013 RHIC & AGS Annual Users' Meeting

  6. Two-Particle Correlations Very similar to LHC! Central-peripheral difference is symmetric: two ridges? or flow? Near- and away-side features seen in both central and peripheral; Δη gap limited to Δη>0.5 arXiv:1303.1794 2013 RHIC & AGS Annual Users' Meeting

  7. Just Geometry + Flow? Fourier moments Cn of (Cent-Periph) distributions versus associated pT Inferred quadrupolar anisotropy v2 of h+- vs pT PHENIX arXiv:1303.1794 arXiv:1304.3403 2013 RHIC & AGS Annual Users' Meeting

  8. Rapidity Matters… PHOBOS Phys. Rev. C72, 031901 More central d+Au produces more “bulk” going with Au x10 xd<<xAu xd>>xAu x3 xd~xAu Is it purely a parton-level effect? Or is there more to it? 2013 RHIC & AGS Annual Users' Meeting

  9. Large Dh Correlations First observation of long – range ridge correlations at RHIC! 2013 RHIC & AGS Annual Users' Meeting

  10. Open Heavy Flavor Single leptons from heavy flavor decays BBC μ μ e Qualitatively consistent with expectation: Au-going enhanced d-going decreased with centrality 2013 RHIC & AGS Annual Users' Meeting

  11. Confronting the J/Y Trends broadly consistent with more production in Au-going direction. Can we determine transverse spatial dependence of nuclear modification? Baseline model --EPS09 with linear thickness dependence, plus single breakup-cross section -- cannot reproduce centrality dependence in detail. PHENIX Phys. Rev. Lett. 107, 142301 (2011) 2013 RHIC & AGS Annual Users' Meeting

  12. Comparing the J/Y and Y’ Expect increasedsuppression whentime in nucleusis comparable to formation time Y’ data indicatethat there are effects at shorttimescales that suppress Y’ relativeto J/Y. PHENIX arXiv:1305.5516 2013 RHIC & AGS Annual Users' Meeting

  13. Cu+Au: Geometry! • Left/right asymmetric density profile. • Odd Harmonics • Corona on Au-side Find x: • Central collisions • No corona on Cu-goingside A program that takes advantage of unique capabilities at RHIC: 2013 RHIC & AGS Annual Users' Meeting

  14. Harmonic Components Stronger v1, opposite sign from AMPT. v2 trends as expected AnetaIordanova (Wednesday) 2013 RHIC & AGS Annual Users' Meeting

  15. RHIC and LHC No change in shape across a wide range in center-of-mass energy – driven by geometry! Jeff Mitchell (Wednesday) 2013 RHIC & AGS Annual Users' Meeting

  16. A lot going on with Au+Au… Suppression of high zT hadronscorrelated with direct photons – another (key) handle on jet quenching • There’s a lot underway…. • Gamma-hadron correlations • Azimuthal HBT • Dileptons with the HBD • Heavy flavor with the VTX/FVTX • … arXiv:1212.3323 2013 RHIC & AGS Annual Users' Meeting

  17. Run-13, Spin, and the W Data production underway – expect to analyze Run-13 500 GeV data during SpinFest @ RIKEN in July 156 pb-1 Ming Liu (Tuesday) Hubert van Hecke (Thursday) 2013 RHIC & AGS Annual Users' Meeting

  18. max signal expected from DSSV ALL At Forward Rapidity Relative Luminosity Syst Error History • RL syst. uncert. O(10-3) • Run9 Stat uncert. O(10-3) • BUT • Forward asymmetry O(10-4) (expected) • On disk already: FOM 50x greater than run9, so new stat error will be O(10-4) • RL syst. uncert. hopefully also gets to O(10-4) Scott Wolin (Tuesday) 2013 RHIC & AGS Annual Users' Meeting

  19. The Future • New upgrades ready for new physics! MPC-EX Upgrade (2015) – spin andCNM physics The FVTX and VTX – ready for HI measurements in 2014! 2013 RHIC & AGS Annual Users' Meeting

  20. p+A: More Geometry Control • d+A collisions are NOT p+A collisions! • Large intrinsic e2 • RHIC has the unique capability to vary the collision geometry to explore the initial state He3+Au MC Glauber 2013 RHIC & AGS Annual Users' Meeting

  21. Polarizedp+A Collisions Richard Seto (Tuesday) Kang, Yuan: PRD 84, 034019 (2011) Left Qsp2 = (1.0 GeV)2 QsA2 = (2.5 GeV)2 d = 0.16 GeV Right Single spin asymmetries can act as a probe of the saturation scale. • Dependence of QsAon A • Combined with other measurements this can estimate Qsp A unique capability of RHIC! 2013 RHIC & AGS Annual Users' Meeting

  22. Conclusions • To extract fundamental QCD physics from the QGP at RHIC we will have to deal with initial state aspects: • Cold Nuclear Matter (nPDF’s) • Finite-size systems (geometry) • Exciting new physics? • We are now entering a phase where we have detailed measurements that will make this possible! • Spin measurements are relentlessly constraining the gluon spin • PHENIX will continue to pursue a broad-ranging, curiosity-driven physics program that takes full advantage of the flexibility of RHIC! 2013 RHIC & AGS Annual Users' Meeting

  23. BACKUP 2013 RHIC & AGS Annual Users' Meeting

  24. Transverse Energy Transverse energy for Cu+Cu similar to Au+Au at same Npart, but Cu+Au higher. Jeff Mitchell (Wednesday) 2013 RHIC & AGS Annual Users' Meeting

  25. Upsilon 2013 RHIC & AGS Annual Users' Meeting

  26. Ridge in d+Au 2013 RHIC & AGS Annual Users' Meeting

  27. Identified RdAu 2013 RHIC & AGS Annual Users' Meeting

  28. Y’/(J/Y) 2013 RHIC & AGS Annual Users' Meeting

  29. Template 2013 RHIC & AGS Annual Users' Meeting

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