First thoughts about ep ea collisions at phenix
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First Thoughts about ep/eA collisions at PheniX. Physics Topics. unpolarised and polarised inclusive physics detect only the scattered lepton F 2 and F L for proton and nuclei, g 1 and g 2 for proton / He-3. Assumptions: 10GeV x 100GeV/n √ s =63GeV Ldt = 4/A fb -1

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First Thoughts about ep/eA collisions at PheniX

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First thoughts about ep ea collisions at phenix

First Thoughts about ep/eA collisions at PheniX

E.C. Aschenauer PheniX & STAR meet EIC


Physics topics

Physics Topics

  • unpolarised and polarised inclusive physics

    • detect only the scattered lepton

    • F2 and FL for proton and nuclei, g1 and g2 for proton / He-3

  • Assumptions:

  • 10GeV x 100GeV/n

    • √s=63GeV

  • Ldt = 4/A fb-1

    • equiv to 3.8 1033 cm-2s-1

    • T=4weeks; DC:50%

  • Detector: 100% efficient

    • Q2 up to kin. limit sx

  • Statistical errors only

    • Note: L~1/A

  • smearing effects can be significant

shadowing

LHC h=0

RHIC h=3

“sweet” spot

R=1

antishadowing

E.C. Aschenauer PheniX & STAR meet EIC


Physics topics1

Physics Topics

  • unpolarised and polarised inclusive physics

    • detect only the scattered lepton

    • F2 and FL for proton and nuclei, g1 and g2 for proton / He-3

  • Lets get a feeling for systematic

  • uncertainties:

  • 1% energy-to-energy normalization

  • low detector smearing will be crucial

    • tracking vs. calorimetry

    • 1 - 2% vs. 5 - 10%

FL for fixed electron energy (4GeV)

and proton energies:

50, 70, 100, 250 GeV

Luminosity: 4fb-1 each setting

E.C. Aschenauer PheniX & STAR meet EIC


Physics topics2

Physics Topics

  • unpolarised and polarised inclusive physics

    • detect only the scattered lepton

    • F2 and FL for proton and nuclei, g1 and g2 for proton / He-3

Same issues with detector

resolution as F2 and FL

in addition need to reduce

systematics due to polarisation

Integrated Lumi: 5fb-1

E.C. Aschenauer PheniX & STAR meet EIC


Kinematics

Kinematics

Q2

x

E.C. Aschenauer PheniX & STAR meet EIC


E kinematics

e’ Kinematics

  • Lets concentrate on 4GeV lepton energy

    • electron beam “replaces” yellow hadron beam

Proton Energy

50 GeV 100 GeV 250 GeV

p/A

e-

180o 0o

pe: 0-1 GeV

pe: 1-2 GeV

pe: 3-4 GeV

pe: 2-3 GeV

4x50

E.C. Aschenauer PheniX & STAR meet EIC


Hadron kinematics

Hadron Kinematics

4x50

4x100

4x250

4x100

4x50

4x250

E.C. Aschenauer PheniX & STAR meet EIC


Diffractive physics p kinematics

?

Diffractive Physics: p’ kinematics

t=(p4-p2)2 = 2[(mpin.mpout)-(EinEout - pzinpzout)]

4 x 50

4 x 250

4 x 50

4 x 100

Diffraction:

E.C. Aschenauer PheniX & STAR meet EIC


Current phenix detector at rhic

Current PHENIX Detector at RHIC

MPC 3.1 < | h | < 3.9

2.5o < Q < 5.2o

Muon Arms 1.2 < | h | < 2.4

South: 12o < Q < 37o

North: 10o < Q < 37o

Central Arms | h | < 0.35

60o < Q < 110o

electrons will not make it

to the south muon arm

 to much material

e-

E.C. Aschenauer PheniX & STAR meet EIC


What will the current phenix see

What will the current PheniX see

pe: 0-1 GeV

pe: 1-2 GeV

pe: 3-4 GeV

pe: 2-3 GeV

4x100

Current PheniX detector

not really useable for

DIS

acceptance not matched to DIS kinematics

4x100

4x100

E.C. Aschenauer PheniX & STAR meet EIC


How should a ephenix look like

How should a ePheniX look like

  • Coverage in |h| =< 3  0.1 < Q2 < 100 (5o – 175o)

    • need an open geometry detector

    • planes for next decadal plan

      • replace current central detector with a new one covering |h| =< 1

      • replace South muon arm by a endcap spectrometer able to do DY

        at |h| > 2.5, preferable 3 < |h| < 4

North Muon Arm

might need a RICH

for HI physics or PID

HCAL

HCAL

EMCAL

2T Solenoid

EMCAL

Preshower

5o @ 2m

17.4 cm dy

Silicon Tracker

VTX + 1 layer

40cm

IP

Silicon Tracker

FVTX

1.2 < h< 2.7

8o < q< 37o

at least 1.5m

could be ILC-type HCAL

with m-ID

E.C. Aschenauer PheniX & STAR meet EIC


Questions which need answers

Questions which need answers

  • is inclusive physics all we want to do?

  • do we want to run through at all stages of eRHIC from 4x250 to 20x250

  • measuring luminosity for ep/eA

  • symmetric vs. asymmetric collisions

    • for ep/eA collisions the IP would be much better not in the center of the detector but shifted to negative z

    • Problem silicon detectors: massive support material in the acceptance

  • material budget in the RHIC detectors

    • momentum resolution critical for precision inclusive physics

    • material and size of beam pipe

E.C. Aschenauer PheniX & STAR meet EIC


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