1 / 12

First Thoughts about ep/eA collisions at PheniX

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

wyatt
Download Presentation

First Thoughts about ep/eA collisions at PheniX

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. First Thoughts about ep/eA collisions at PheniX E.C. Aschenauer PheniX & STAR meet EIC

  2. 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

  3. 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

  4. 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

  5. Kinematics Q2 x E.C. Aschenauer PheniX & STAR meet EIC

  6. 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

  7. Hadron Kinematics 4x50 4x100 4x250 4x100 4x50 4x250 E.C. Aschenauer PheniX & STAR meet EIC

  8. ? 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

  9. 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

  10. 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

  11. 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

  12. 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

More Related