PHENIX p/d+A , e+A overview

PHENIX p/d+A, e+A overview

p,d,e+A WorkshopBNL, June 26, 2013

R. SetoUniversity of California, Riverside

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Outline

• The present: Setting the stage – Old and New PHENIX results

• The immediate future– MPC-EX: • direct photons and π0s at high η in p+A, H3+Au

• Further in the future (brief, covered by J. Huang, workshop 2- forward upgrades)

– fSPHENIX– ePHENIX

3

s

Initial stateColor 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

t~0.6 fm

“Small” systems

1

4s

PHENIX (2011)PRL 107, 252301

4

p+Pb, d+Au


A Control and the initial state

t

η

PHENIX PRL 91, 072303 (2003)

PRL 107, 172301(2011)

QS

5


Δη

p+Pb, d+Au LHC: the ridge??

t

η

ATLAS PRL 110 182302 (2013)

0.5 4associatedTp

Y=“per trigger yield”

Central 2%

2<|Δη|<5

trig

assoc

Central 2%Periph 52%

?

6

p+Pb, d+Au PHENIX

arXiv 1303.1794

v2

Au+Au

PRL 105, 062301 (2010)

0-5%

0.25

d+Au

0.5<|Δη|<0.7

7

Mid-Forward Particle/Energy Correlations

3<|Δη|<4

8

3<|Δη|<4

9


Δη

p+Pb, d+Au

t

η

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

Glasmat~0.6 fm

11

Δη


Pre-thermalizationGlasma?

p+Pb, d+Au Glasma? Long range rapidity Correlations

Hypothesis I: Initial state fluctuations “inflated” to long range correlations

t

η

Glasmat~0.6 fm

Δ ϕ

Atlas Data comparedTo Glasma modelQ0

2(proton)=0.168 GeV2

Dusling, VenugopalanarXiv:1302.7018 (2013)

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Δη


ThermalizedHydrodynamicsFlow: sQGP.

Pre-thermalization

p+Pb, d+Au Flow?

sQGP in small systems?

Hypothesis II: Flow (Hydro) In a thermalized sQGP

sQGP

t~0.6 fm

HydrodynamicCalculationsP. Bozek PRC 85, 014911

1

4s

13

Conclusions?

• None yet• Very interesting phenomena• More Experimental data/Theoretical work

needed

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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• RG in p+A

• AN in polarized p+A as a measure of QS

• What is the origin of long range rapidity correlations in small systems? controlling the geometry– p+A (Au, Cu, Si, C) , He3+Au– Present ideas: the Glasma, Flow in small systems

InitialState?

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MPC-EX reconstruction of π0s and γdirect at forward rapidity

from low Q2 to kinematic limit

3.1<|η|<3.8

8 layer(4X0) Silicon minipad, Tungsten sandwich Preshower in front of PbWO4 MPC calorimeterarXiv:1301.1096

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How does it work?

MPC: Shower energyMPC-EX

40 GeV π0

Opening angleEnergy Sharing

γγ invariant mass

40 GeV single γ

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Projected γdir Measurement of nuclear gluon distribution as benchmark

Present limits

Projected90% CL

Nuclear Mod. Factor pAdirect

G ppdirect

xGR

A xG

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Polarized p+A Collisionsas a measurement of Qs

Kang, Yuan: PRD 84, 034019 (2011)

Single spin asymmetries can act as a probe of the saturation scale.

RL

RL

N PA

1

Right

Left

• Dependence of QsA on A, centrality• Combined with other measurements this can estimate Qsp

at pt <<Qsat

Large π SSAs seen at forward rapidityIn transversely polarized pp at RHIC

π

π

π

Spin Dependent Cross section

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Kang, Yuan: PRD 84, 034019 (2011)

Transversely polarizedproton

Collins FragmentationFunction

πk┴,π

P

sp

sq

A

q

This is one mechanism. Others:e.g. Sivers: see Boer et al. PRD 74, 074018Kang-Xiao arXiv 1212.4309Odderon (3 gluon)exchange: Yovchegov arXiv:1201.5890

2 2/

2

1( , ) Sk Q

FS

N x k eQ

CGC inspired k┴ dependent unintegrated Gluon distribution functionLow-x

Relative toQuark jet

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π0 in Polarized p+A as a tool to study Gluon saturation

2 1/3, ,sat A sat protonQ cA Q

pRight

Left

RL

RL

N PA

1

2 2 2

2 2

2/

2h sp

h sA

pA hP QspN

pp hN sAP Q

QAe

A Q

2, 1.0 0.5proton

sat gluonsQ GeV c

A

pT

21


Right

Left

2 2 2

2 2

2/

2h sp

h sA

pA hP QspN

pp hN sAP Q

QAe

A Q

2, 0.45 0.5proton

sat gluonsQ GeV c

RL

RL

N PA

1


p

A

pT

22


Right

Left

2 2 2

2 2

2/

2h sp

h sA

pA hP QspN

pp hN sAP Q

QAe

A Q

2, 1.0 1.0 (nuclear diluteness)proton

sat gluonsQ GeV c

RL

RL

N PA

1


p

A

pT

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THE LONGER TERM

sPHENIX, fsPHENIX, ePHENIX

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 eA @ L=6×1032 cm-2 s-1, pp equiv– 10 x255 (ep) @ L= 1033 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 3024

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 2019

25

arXiv:1207.6378

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PHENIX (2013)• fsPHENIX

– Physics• Transverse spin of proton• p+A studies (e.g. G1 , G2)• 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?

Details in Workshop 2: Jin Huang

~2025

Jin Huang <[email protected]> 27Workshop on Forward upgrades

A detector concept – EIC collisions

p/A e-

Aerogel&

RICH

GEMStation4

EMCal

HCal

GEMStation2

z (cm)

R (cm)

HCal

EMCal& Preshower

GEMs

EMCal & Preshower

μ-TPC

DIRC

η~1

η~4

-1.2

R (cm)

GEMStation3

GEMsStation1

η~-1

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PHENIX+MPC-EX → sPHENIX→fsPHENIX→ePHENIX

GlasmasQGP?

e+p

e+A

Conclusions• “small” systems (p/d/He3+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/He3+A) – Gluon “suppression” at low-x via direct photons

– AN π0 in p+A as a measurement of QS

• PHENIX→sPHENIX→fsPHENIX→ePHENIX– Evolutionary program for a study of the sQGP, Cold nuclear

matter (saturation), and proton spin29

PHENIX p/d+A , e+A overview

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