SIDIS

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EPIC SIDIS Working Group

Conveners:

  • Marco Radici (marco.radici0@gmail.com‎)
  • Ralf Seidl (rseidl@ribf.riken.jp)
  • Charlotte Van Hulse (cvanhuls@mail.cern.ch)
  • Anselm Vossen (anselm.vossen@duke.edu)

Meetings: INDICO every second Tuesday @ 8:30 am EST.

Email-list subscription: HERE

EPIC SIDIS Task lists

epic-analysis: common software framework (for DIS, SIDIS and jet reconstruction)

  • Contact for implementation: Chris Dilks (christopher.dilks@duke.edu)

Introduction

List of tasks

  • Implementation and testing of reconstruction methods:
    • electron, Jacquet-Blondel, double-angle and sigma methods
      • expertise level: low
      • duration: 1 month
      • assigned to:
    • kinematic fitting
      • expertise level: medium-high
      • duration: 2 months
      • assigned to:
    • machine learning
      • expertise level: high
      • duration: 3 months
      • assigned to:
  • Implementation and testing of reconstructing particles:
    • electron: tracking vs. EMCAL
      • expertise level: medium
      • duration: 2 months
      • assigned to:
    • charged hadrons: tracking vs. HCAL
      • expertise level: medium
      • duration: 2 months
      • assigned to:
    • neutral particles: study of cluster isolation criteria
      • expertise level: medium
      • duration: 3 months
      • assigned to:
  • More tasks:

Monte-Carlo simulations

List of available simulations

  • ATHENA:
    • Latest production, December 2021: "DeathValley" at S3/eictest/ATHENA/RECO/deathvalley-v1.0/
(Semi-)Inclusive files From Pythia 8 HEPMC: S3/eictest/ATHENA/EVGEN/DIS/NC/
  • Q2>1 GeV2
  • Q2>10 GeV2
  • Q2>100 GeV2
  • Q2>1000 GeV2
  • Older productions (Canyonlands, Acadia) found in other ATHENA/RECO directories
  • ECCE (EPIC, but with ECCE Software Stack):
    • Latest production, September 2022: "22.1" at S3/eictest/EPIC/Campaigns/22.1/SIDIS/pythia6
(Semi-)Inclusive files From Pythia 6: S3/eictest/ECCE/ProductionInputFiles/SIDIS/pythia6
  • Q2>1 GeV2 (general Q2)
  • 1<Q2<100 GeV2 (low Q2)
  • Q2>100 GeV2 (high Q2)

Link to 2022-Q3 resource request: HERE

Points to check wrt. simulation: Correct handling of the crossing angle?

Monte-Carlo production with radiative effects

  • task assigned to R. Seidl (rseidl@ribf.riken.jp)

Physics channels

Collinear double-helicity asymmetry [sea-quark helicity PDFs]

  • task assigned to C. Van Hulse (cvanhuls@mail.cern.ch)
  • Status: framework ready
  • ToDo:
    • realistic PID (priority: high)
    • radiative effects (priority: high)
    • inclusion of realistic simulations with background (priority: medium-high)
    • inclusion of new PDF/FF set to study variation of outcome (priority: medium)
    • implementation of unfolding (priority: medium, when sufficient simulation available)
    • study impact of tracking resolution backwards

Unpolarised TMD measurements [spin-independent TMD PDFs/FFs]

  • task assigned to R. Seidl (rseidl@ribf.riken.jp)
  • Status: framework ready
  • ToDo:
    • realistic PID (priority: high)
    • radiative effects (priority: high)
    • inclusion of realistic simulations with background (priority: medium-high)
    • inclusion of new PDF/FF set to study variation of outcome (priority: medium)
    • implementation of unfolding (priority: medium, when sufficient simulation available)

Sivers and Collins asymmetry [Sivers TMD, transversity, tensor charge, Collins FF]

  • task assigned to R. Seidl (rseidl@ribf.riken.jp)
  • Status: framework ready
  • ToDo:
    • realistic PID (priority: high)
    • radiative effects (priority: high)
    • inclusion of realistic simulations with background (priority: medium-high)
    • inclusion of new PDF/FF set to study variation of outcome (priority: medium)
    • implementation of unfolding (priority: medium, when sufficient simulation available)

Dihadron asymmetry [transversity, tensor charge, collinear dihadron FF]

  • Gregory Matousek
  • Status: framework ready
  • ToDo:
    • realistic PID (priority: high)
    • radiative effects (priority: high)
    • inclusion of realistic simulations with background (priority: medium-high)
    • inclusion of new PDF/FF set to study variation of outcome (priority: medium)
    • implementation of unfolding (priority: medium, when sufficient simulation available)

High-pT dihadron asymmetry [gluon Sivers]

  • task assigned to C. Van Hulse (cvanhuls@mail.cern.ch)
  • ToDo:
    • implement framework
    • realistic PID (priority: high)
    • radiative effects (priority: high)
    • inclusion of realistic simulations with background (priority: medium-high)
    • inclusion of new PDF/FF set to study variation of outcome (priority: medium)
    • implementation of unfolding (priority: medium, when sufficient simulation available)
    • study impact of tracking resolution backwards

Lambda polarisation [polarised FF]

  • Enea Prifti
  • Status: framework ready
  • ToDo:
    • realistic PID (priority: high)
    • radiative effects (priority: high)
    • inclusion of realistic simulations with background (priority: medium-high)
    • inclusion of new PDF/FF set to study variation of outcome (priority: medium)
    • implementation of unfolding (priority: medium, when sufficient simulation available)

Back-to-back hadrons to probe saturation

  • Connor Pecar
  • Status: framework ready
  • ToDo:
    • realistic PID (priority: high)
    • radiative effects (priority: high)
    • inclusion of realistic simulations with background (priority: medium-high)
    • inclusion of new PDF/FF set to study variation of outcome (priority: medium)
    • implementation of unfolding (priority: medium, when sufficient simulation available)
    • study impact of tracking resolution backwards
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