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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. 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

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phenix p d a e a overview

PHENIX p/d+A, e+A overview

p,d,e+AWorkshop

BNL, June 26, 2013

R. Seto

University of California, Riverside

outline
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
au au pb pb sqgp how is it born
Au+Au, Pb+Pb: sQGP. How is it born?

Δη

s

Thermalized;

Hydrodynamics;

Flow

sQGP

t~0.6 fm

t

Pre-thermalization;

Glasma?

η

Initial state

Color Glass Condensate?

t=0.0 fm

PHENIX (2011)

PRL 107, 252301

“Small” systems

slide4

p+Pb, d+Au

A Control and the initial state

PHENIX PRL 91, 072303 (2003)

t

η

QS

Initial state

Color Glass Condensate?

t=0.0 fm

PRL 107, 172301(2011)

slide5

p+Pb, d+Au

LHC: the ridge??

Central 2%

trig

assoc

Δη

?

Y=“per trigger yield”

Central 2%

Periph 52%

t

η

Initial state

Color Glass Condensate?

t=0.0 fm

2<|Δη|<5

ATLAS PRL 110 182302 (2013)

slide6

p+Pb, d+Au

PHENIX

0.25

Au+Au

0-5%

PRL 105, 062301 (2010)

v2

d+Au

0.5<|Δη|<0.7

arXiv1303.1794

slide9

p+Pb, d+Au

Δη

t

η

Initial state

Color Glass Condensate?

t=0.0 fm

slide10

p+Pb, d+Au

Glasma? Long range rapidity Correlations

Δη

t~0.6 fm

Glasma

t

Pre-thermalization;

Glasma?

η

Initial state:

Color Glass Condensate?

t=0.0 fm

Hypothesis I: Initial state fluctuations

“inflated” to long range correlations

slide11

p+Pb, d+Au

Glasma? Long range rapidity Correlations

Δη

Atlas Data compared

To Glasma model

Q02(proton)=0.168 GeV2

Dusling, Venugopalan

arXiv:1302.7018 (2013)

t~0.6 fm

Glasma

t

Pre-thermalization

Glasma?

η

Initial state

Color Glass Condensate?

t=0.0 fm

Δ ϕ

Hypothesis I: Initial state fluctuations

“inflated” to long range correlations

slide12

p+Pb, d+Au

Flow?

sQGP in small systems?

Δη

Thermalized

Hydrodynamics

Flow: sQGP.

sQGP

t~0.6 fm

Pre-thermalization

Hydrodynamic

Calculations

P. Bozek PRC 85, 014911

Initial state

Color Glass Condensate?

t=0.0 fm

Hypothesis II: Flow (Hydro)

In a thermalized sQGP

conclusions
Conclusions?
  • None yet
  • Very interesting phenomena
  • More Experimental data/Theoretical work needed
the immediate future p a run 15 mpc ex upgrade to phenix
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 polarizedp+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

Initial

State?

mpc ex reconstruction of 0 s and direct at forward rapidity from low q 2 to kinematic limit
MPC-EX reconstruction of π0s and γdirect at forward rapidityfrom low Q2to kinematic limit

3.1<|η|<3.8

8 layer(4X0) Silicon minipad, Tungsten sandwich Preshower

in front of PbWO4 MPC calorimeter

arXiv:1301.1096

how does it work
How does it work?

MPC: Shower energy

MPC-EX

 γγ invariant mass

Opening angle

Energy Sharing

40 GeV single γ

40 GeV π0

polarized p a collisions as a measurement of qs
Polarizedp+A Collisionsas a measurement of Qs

Large π SSAs seen at forward rapidity

In transversely polarized pp at RHIC

Left

at pt <<Qsat

Right

π

π

π

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

Kang, Yuan: PRD 84, 034019 (2011)

  • Dependence of QsAon A, centrality
  • Combined with other measurements this can estimate Qsp
spin dependent cross section
Spin Dependent Cross section

Kang, Yuan: PRD 84, 034019 (2011)

A

sp

Relative to

Quark jet

CGC inspired k┴ dependent unintegrated

Gluon distribution function

Low-x

Transversely polarized

proton

P

sq

q

k┴,π

π

Collins Fragmentation

Function

This is one mechanism. Others:

e.g. Sivers: see Boer et al. PRD 74, 074018

Kang-Xiao arXiv 1212.4309

Odderon (3 gluon)exchange: YovchegovarXiv:1201.5890

ephenix loi charge
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, ppequiv
    • 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 30
sphenix
sPHENIX
  • Jets+heavy flavor in Heavy Ion Collisions
    • Replace central arms with hermetic detector
    • HCAL, EMCAL, Preshower, tracking w/solenoidal B

arXiv:1207.6378

2015 incl MPC-EX

2019

slide26

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

a detector concept eic collisions
A detector concept – EIC collisions

η~1

R (cm)

R (cm)

HCal

η~-1

HCal

EMCal

-1.2

Aerogel

&

RICH

EMCal & Preshower

EMCal

& Preshower

μ-TPC

η~4

GEM

Station2

z (cm)

GEMs

GEMs

Station1

GEM

Station3

GEM

Station4

DIRC

p/A

e-

Jin Huang <jhuang@bnl.gov>

conclusions1
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
    • ANπ0 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 spin