Exclusive WG

Simulation tasks/goals for Exclusive Reactions

• DVCS reconstruction resolution:
  • 1. Delta^2 = (k-k’-q’)^2: “Electron Method”:
    • a. Independent of ion beam 3-momentum spread
    • b. Independent of far-forward acceptance
    • c. Delta^2 or Delta_perp^2 ?
  • 2. Proton (MILOU or TOPEG)
    • a. 10 x 275
    • b. 5 x 100
    • c. 5 x 275
  • 3. 4He (TOPEG)
    • a. 5 x 100 GeV/u
    • b. 10x 275*Z = 10x 137.5/u

Details of DELPHES analysis of DVCS simulation: DVCS Reconstruction

TOPEG Configuration & Outputs

All topeg output files can be found at /work/eic/users/psimmerl/

Current outputs:

Configuration : /work/eic/users/psimmerl/topeg_configs/

• Electron Beam Helicities: -1, +1
• t range: (0.001, 1.2)
• y range: (0.05, 0.90)
• Q2 range: (4, 100)
• W2 min: 16
• theta max electron (radians): 1.5708
• Nb of TFoam cells: 10000
• Nb of samples per cell: 200
• Electron beam energies: 5, 10
• Proton beam energy: 41, 100, 275
• He4 beam energy: 81, 400, 550
  • Using "Model 3 - Coherent He-4 DVCS theoretical model but neglecting the real part of H"

All 250,000 events (except proton 10x275 which is still running as of 10/19/21 4pm EDT, will finish by 10/23/21(?))

• Grids can be accessed at /work/eic/users/psimmerl/topeg_grids/
• Output events can be accessed at /work/eic/users/psimmerl/topeg_output/
  • Format CORE_{electron beam energy}x{ion beam energy}-M{3 if He4, 4 if proton}-{N if negative electron helicity, P if positive}.root
    • ex. CORE_5x41-M4-Nh.root

Increasing Nb of samples per cell

Configuration : /work/eic/users/psimmerl/topeg_moresamples_configs/

• Nb of samples per cell: 10000
• Rest are same as above

Jobs are running as of 10/19/21 4pm EDT

• Currently generating grid should finish by 10/22/21(?)
• Hope to have 1,000,000 events/config by 10/27/21(?)
• Grids can be accessed at /work/eic/users/psimmerl/topeg_moresamples_grids/
• Output events can be accessed at /work/eic/users/psimmerl/topeg_moresamples_output/

MILOU Data files at BNL

• /gpfs/mnt/gpfs02/eic/DATA/MILOU/newfiles/NEWMILOU/*.out
• /gpfs/mnt/gpfs02/eic/DATA/munoz/milou3d_*.out

new EPIC dvcs generator (PARTONS based)

• Code in beta-testing phase
• Data files at BNL: /gpfs/mnt/gpfs02/eic/DATA/EpIC/
• example at /gpfs/mnt/gpfs02/eic/DATA/munoz/epic/fixed.txt