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PHENIX p/d+A, e+A overview p,d,e+A Workshop BNL, June 26, 2013 R. Seto University of California, Riverside.

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Presentation on theme: "PHENIX p/d+A, e+A overview p,d,e+A Workshop BNL, June 26, 2013 R. Seto University of California, Riverside."— Presentation transcript:

1 PHENIX p/d+A, e+A overview p,d,e+A Workshop BNL, June 26, 2013 R. Seto University of California, Riverside

2 Outline The present: Setting the stage – Old and New PHENIX results The immediate future – MPC-EX: direct photons and π 0 s at high η in p+A, H 3 +Au Further in the future (brief, covered by J. Huang, workshop 2- forward upgrades) – fSPHENIX – ePHENIX 2

3 s Initial state Color Glass Condensate? t=0.0 fm Thermalized; Hydrodynamics; Flow Pre-thermalization; Glasma? Au+Au, Pb+Pb: sQGP. How is it born? Δη t η sQGP 3 t~0.6 fm “Small” systems PHENIX (2011) PRL 107,

4 p+Pb, d+Au Initial state Color Glass Condensate? t=0.0 fm A Control and the initial state t η 4 PHENIX PRL 91, (2003) PRL 107, (2011) QSQS

5 Initial state Color Glass Condensate? t=0.0 fm Δη p+Pb, d+Au LHC: the ridge?? t η 5 ATLAS PRL (2013) Y=“per trigger yield” Central 2% 2<|Δη|<5 trig assoc Central 2% Periph 52% ?

6 p+Pb, d+Au PHENIX 6 arXiv v2v2 Au+Au PRL 105, (2010) 0-5% 0.25 d+Au 0.5<|Δη|<0.7

7 Mid-Forward Particle/Energy Correlations 7 3<|Δη|<4

8 8

9 Initial state Color Glass Condensate? t=0.0 fm Δη p+Pb, d+Au t η 9

10 Δη Initial state: Color Glass Condensate? t=0.0 fm Pre-thermalization; Glasma? p+Pb, d+Au Glasma? Long range rapidity Correlations Hypothesis I: Initial state fluctuations “inflated” to long range correlations t η Glasma 10 t~0.6 fm

11 Δη Initial state Color Glass Condensate? t=0.0 fm Pre-thermalization Glasma? p+Pb, d+Au Glasma? Long range rapidity Correlations Hypothesis I: Initial state fluctuations “inflated” to long range correlations t η Glasma 11 t~0.6 fm Δ ϕΔ ϕ Atlas Data compared To Glasma model Q 0 2 (proton)=0.168 GeV 2 Dusling, Venugopalan arXiv: (2013)

12 Δη Initial state Color Glass Condensate? t=0.0 fm Thermalized Hydrodynamics Flow: sQGP. Pre-thermalization p+Pb, d+Au Flow? sQGP in small systems? Hypothesis II: Flow (Hydro) In a thermalized sQGP sQGP 12 t~0.6 fm Hydrodynamic Calculations P. Bozek PRC 85,

13 Conclusions? None yet Very interesting phenomena More Experimental data/Theoretical work needed 13

14 The Immediate future (p+A – run 15): MPC-EX upgrade to PHENIX How do gluons behave at very high density (i.e. low-x)  What is the initial condition for formation of the sQGP? – Present ideas: CGC, Modified Structure functions, shadowing R G in p+A A N in polarized p+A as a measure of Q S What is the origin of long range rapidity correlations in small systems?  controlling the geometry – p+A (Au, Cu, Si, C), He 3 +Au – Present ideas: the Glasma, Flow in small systems 14 Initial State?

15 MPC-EX reconstruction of π 0 s and γ direct at forward rapidity from low Q 2 to kinematic limit 3.1<|η|<3.8 8 layer(4X 0 ) Silicon minipad, Tungsten sandwich Preshower in front of PbWO 4 MPC calorimeter 15 arXiv:

16 How does it work? 40 GeV π 0 Opening angle Energy Sharing  γγ invariant mass 40 GeV single γ 16

17 Projected γ dir Measurement of nuclear gluon distribution as benchmark Present limits Projected 90% CL 17

18 Polarized p+A Collisions as a measurement of Qs Kang, Yuan: PRD 84, (2011) Single spin asymmetries can act as a probe of the saturation scale. Right Left Dependence of Q sA on A, centrality Combined with other measurements this can estimate Q sp at pt <

19 Spin Dependent Cross section 19 Kang, Yuan: PRD 84, (2011) Transversely polarized proton Collins Fragmentation Function π k ┴, π P spsp sqsq A q This is one mechanism. Others: e.g. Sivers: see Boer et al. PRD 74, Kang-Xiao arXiv Odderon (3 gluon)exchange: Yovchegov arXiv: CGC inspired k ┴ dependent unintegrated Gluon distribution function Low-x Relative to Quark jet

20 π 0 in Polarized p+A as a tool to study Gluon saturation 20 p Right Left A pTpT

21 21 π 0 in Polarized p+A as a tool to study Gluon saturation Right Left p A pTpT

22 22 π 0 in Polarized p+A as a tool to study Gluon saturation Right Left p A pTpT

23 THE LONGER TERM sPHENIX, fsPHENIX, ePHENIX 23

24 ePHENIX LOI - Charge Plans to upgrade/reconfigure PHENX to form a first generation eRHIC detector Important part of BNL’s strategic plan for LRP Plan for machine: – 10x100 L=6×10 32 cm -2 s -1, pp equiv – 10 x255 L= cm -2 s -1 Physics reach ala EIC white paper Technical detail – Sufficient to provide a preliminary cost estimate – Rough construction schedule Due date: Sept 30 24

25 sPHENIX Jets+heavy flavor in Heavy Ion Collisions – Replace central arms with hermetic detector – HCAL, EMCAL, Preshower, tracking w/solenoidal B 2015 incl MPC-EX arXiv:

26 PHENIX (2013) fsPHENIX – Physics Transverse spin of proton p+A studies (e.g. G 1, G 2 ) Heavy ions under study – Add forward arm EMCAL, HCAL Tracking: GEMS+Bfield PID: RICH ePHENIX – Physics Nucleon spin structure (ΔG) TMD, motion of confined partons Parton imaging (Lum?) Gluon saturation – diffractive events – Additional detectors EMCAL in electron direction DIRC in central ARMS Replace central tracking with TPC or GEMs Roman Pots? 26 Details in Workshop 2: Jin Huang ~2025

27 Workshop on Forward upgrades Jin Huang 27 A detector concept – EIC collisions p/A e-e- e-e- Aerogel & RICH GEM Station4 HCal GEM Station2 z (cm) R (cm) HCal GEMs μ-TPC DIRC η~1 η~ R (cm) GEM Station3 GEMs Station1 η~-1

28 PHENIX+MPC-EX → sPHENIX → fsPHENIX → ePHENIX 28 Glasma sQGP? e+p e+A

29 Conclusions “small” systems (p/d/He 3 +A) are exhibiting exciting new phenomena – Study of initial state – New ideas Study of pre-thermalized state (GLASMA) Perhaps study of sQGP in small systems MPC-EX – new tool for study of (p/d/He 3 +A) – Gluon “suppression” at low-x via direct photons – A N π 0 in p+A as a measurement of Q S PHENIX→sPHENIX→fsPHENIX→ePHENIX – Evolutionary program for a study of the sQGP, Cold nuclear matter (saturation), and proton spin 29


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