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ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya PHENIX highlights.

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Presentation on theme: "ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya PHENIX highlights."— Presentation transcript:

1 ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya PHENIX highlights

2 Introduction Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 2 RHIC is a unique machine for its versatility Can collide any species from p up to U, at any energy from the top energy of √s NN = 200 GeV down to 7 GeV PHENIX capitalizes on this versatility performing systematic studies of observables as function of system size and colliding energy This talk will focus on recent PHENIX results on these studies

3 Outline  Introduction  Small vs large systems: change of paradigm?  Long range correlations in d, 3 He + Au  v 2 in d, 3 He + Au  HBT radii in d+Au, Cu+Cu  HF and J/ψ R AA in d+Au, Cu+Cu  Lower energies  HBT radii vs energy  dN ch /dη scaling  v 2 energy dependence  HF R AA vs energy  Photons  Summary 3

4 Small systems: paradigm change? Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 4 p+p: reference baseline p,d+A:  System size too small for quark matter formation  Reference for cold nuclear matter effects Is that so? Many features seen in A+A collisions are also seen in high multiplicity p,d+A collisions:

5 Small systems: paradigm change? Small systems: paradigm change? Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 5 p+p: reference baseline p,d+A:  System size too small for quark matter formation  Reference for cold nuclear matter effects Is that so? Many features seen in A+A collisions are also seen in high multiplicity p,d+A collisions:  Long range correlations in d, 3 He+Au

6 Ridge in small systems at RHIC  Long-range near-side peak clearly visible in central d+Au collisions  Not present in minimum bias p+p collisions Min bias p+pCentral d+Au Two particle correlations measured over a large |Δ  | > 2.75 gap (charged track in central arm and tower hit in forward calorimeter) arXiv:1404.7461 Central 3 He+Au  Long-range near-side peak clearly visible in central d+Au and central 3 He+Au collisions  Not present in minimum bias p+p collisions

7 …and at LHC 7 ICPAQGP, Kolkata, February 2-6, 2015  Long-range near-side peak clearly visible in high multiplicity p+Pb collisions as observed in AA collisions at RHIC and LHC CMS p+Pb √s NN =5.02 TeV N trk > 110STAR Au+Au central √s NN =200 GeV PLB 718, 795 (2013)PRC 80, 064912 (2009) …very similar to AA Itzhak Tserruya

8 Long-range correlations in d+Au  No ridge in d-going direction. Shape of correlation changes with centrality  Ridge seen only in Au-going direction. Strong centrality dependence  Peripheral collisions: very similar correlations in d-going and Au-going sides arXiv:1404.7461

9 Ridge in central 3 He+Au  Long-range correlations seen on both Au-going and 3 He-going sides 9Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015  Hydro can explain and reproduce the ridge  Also CGC effective field theory (initial state gluon saturation) can explain the ridge (Phys. Rev. D87, 094034 (2013)).

10 Small systems: paradigm change? Small systems: paradigm change? Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 10 p+p: reference baseline p,d+A:  System size too small for quark matter formation  Reference for cold nuclear matter effects Is that so? Many features seen in A+A collisions are also seen in high multiplicity p,d+A collisions:  Long range correlations in d, 3 He+Au  Flow in d, 3 He+Au

11 Flow in small systems at RHIC 11 ICPAQGP, Kolkata, February 2-6, 2015  Mass ordering seen in d+Au v 2  Data consistent with viscous hydrodynamics (using η/s =1/4π) at p T <2 GeV/c PHENIX arXiv:1404.7461 Itzhak Tserruya  v 2 of 3 He+Au similar to that of d+Au  Clear v 3 signal in central 3 He+Au collisions

12 …and at the LHC 12 ICPAQGP, Kolkata, February 2-6, 2015 …very similar to AA PLB 726, 164 (2013)PRC 72, 014904 (2005) ALICE Itzhak Tserruya  Flow observed in small systems at RHIC and LHC  Similar magnitude and mass ordering as observed in AA collisions

13 Small systems: paradigm change? Small systems: paradigm change? Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 13 p+p: reference baseline p,d+A:  System size too small for quark matter formation  Reference for cold nuclear matter effects Is that so? Many features seen in A+A collisions are also seen in high multiplicity p,d+A collisions:  Long range correlations in d, 3 He+Au  Flow in d, 3 He+Au  HBT radii in d+Au

14 14 HBT radii scale with size arXiv:1410.2559  PHENIX Au+Au and Cu+Cu: HBT radii scale linearly with initial transverse size  ALICE Pb+Pb : same behavior

15 15 ICPAQGP, Kolkata, February 2-6, 2015 …also in small systems a  HBT radii scale linearly with the initial transverse size from small (d+Au, p+Pb) to large (Au+Au, Pb+Pb) systems at RHIC and LHC.  Imply radial expansion in small systems and final state interaction arXiv:1404.5291 Itzhak Tserruya

16 Small systems: paradigm change? Small systems: paradigm change? Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 16 p+p: reference baseline p,d+A:  System size too small for quark matter formation  Reference for cold nuclear matter effects Is that so? Many features seen in A+A collisions are also seen in high multiplicity p,d+A collisions:  Long range correlations in d, 3 He+Au  Flow in d, 3 He+Au  HBT radii in d+Au  HF and J/  R AA in d+Au and Cu+Cu

17 HF R AA system-size dependence Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 17 PRC 90, 034903 (2014)  Smooth evolution of HF R AA from enhancement in small systems to suppression in large systems

18 18 J/  system-size dependence PRC 90, 064908 (2014)  Similar suppression for smaller (CuCu) and larger (AuAu) systems. PRL 101, 122301 (2008)  Similar suppression in Cu+Au (Au-going direction) and Au+Au  Stronger suppression in Cu+Au (Cu-going direction) – opposite of expected trend if suppression is prop to particle density

19 Lower energies Lower energies Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 19

20 HBT vs. collision energy Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 20 PHENIX, STAR and ALICE results combined  Non-monotonic behavior of R out 2 – R side 2 (proportional to emission duration Δ  and (R side -√2R)/ R long (related to medium expansion velocity).   softening of equation of state near the CEP? arXiv:1410.2559

21 dN ch /dη scaling Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 21 N part scalingN quark scaling

22 dN ch /dη scaling Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 22 N part scalingN quark scaling  Normalize highest multiplicity point at each energy to 1  N part scaling works well at low energies  N quark scaling works well at high energies  Transition at ~ 39 GeV.

23 v 2 in Cu+Cu and Au+Au collisions at √s NN =62.4 and200 GeV 23 arXiv:1412.1043 Au+Au Cu+Cu  Almost no difference in v 2 at 200 and 62 GeV in Au+Au and Cu+Cu

24 v 2 energy dependence Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 24  Flow saturates at √s NN = 39 – 200 GeV  Significant decrease at √s NN = 7.7 GeV

25   R AA vs energy Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 25  Central Cu+Cu: Onset of suppression between 22.4 and 62.4 GeV  Central Au+Au: Onset of suppression at energies lower than 39 GeV  But very different N part Cu+Cu PRL 101, 162301 (2008) Au+Au PRL 109, 152301 (2012) N part ≈ 90-98 N part ≈ 315-325

26 HF R AA in Au+Au  Strong suppression  Large v 2  Enhancement – opposite to energy loss models  Same v 2 within uncertainties arXiv:1405.3301PRC 84, 044905 (2011) 200 GeV62.4 GeV 26

27 Photons Photons Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 27

28 Direct photons Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 28  New measurement using external conversion of real photons  Consistent with previous result  Extend range to lower p T, higher statistics arXiv:1405.3940  v 2 remains a challenge for theory. New v 3 data provide additional constraint

29 Direct photons excess: Centrality dependence Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 29  Subtract N coll scaled p+p spectrum  excess photon yield  Fit excess photon yield with Y = A exp(-p T /T)  Inverse slope T independent of centrality arXiv:1405.3940  Integrated excess yield scale as dN/dy = B  N part  with  =1.48±0.08±0.04

30 Future Future Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 30

31 The future: sPHENIX Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 31 arXiv:1501.06197  Excellent jet, dijet, h,  -jet quarkonia capabilities  Designed to be the basis for a future eIC detector  DOE Science Review in July 2014  1.5 T BaBar magnet being moved to BNL

32 Summary Many phenomena observed in A+A collisions are also seen in small systems p,d+A. Interesting features observed at low energies. Direct photons remain a puzzle sPHENIX 32 ICPAQGP, Kolkata, February 2-6, 2015 Itzhak Tserruya

33 Other recent PHENIX results Itzhak Tserruya ICPAQGP, Kolkata, February 2-6, 2015 33 arXiv:1412.1038 HF and J/ψ in d+Au at 200 GeV ϒ in Au+Au J/ψ in U+U, Au+Au, Cu+Cuv 2, v 3, v 4 in Au+AuDark Photons arXiv:1404.2246 arXiv:1409.0651

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