Low Energy Electromagnetic Physics Use Cases and PhysicsLists

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Low Energy Electromagnetic PhysicsUse Cases and
PhysicsLists

• Maria Grazia Pia
• INFN Genova
• on behalf of the Low Energy Electromagnetic
  Working Group

http//www.ge.infn.it/geant4/lowE/
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Use cases

• The most recent use case of Geant4 LowE
  encountered
• X-ray fluorescence generation in ALICE (for
  detailed detector calibration studies)
• Known areas of application (in alphabetical
  order)
• Astrophysics experiments
• Cosmic ray experiments
• Dosimetry
• Fine arts
• HEP experiments
• Medical physics and radiodiagnostics
• Neutrino and dark matter experiments
• Nuclear physics experiments
• Radiobiology
• Radioprotection
• Space science
• etc.

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Guidance to address use cases

• Through advanced examples

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PhysicsLists

• No user has ever asked us for a PhysicsList
• Users often ask us what is the difference between
  standard and LowEnergy processes
• gt99 of the users who have asked me the
  difference between standard and lowenergy had not
  read the related chapters in the Physics
  Reference Manual
• User statistics collected since September 2000
• We address this question by working at a
  quantitative validation of all EM physics models
• Document the difference of behaviour/precision/per
  formance in an objective way
• Provide guidance to users through a
  scientifically rigorous documentation
• Selecting a LowE/standard process in a
  PhysicsList is trivial
• Documented in the Application Developer Guide

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Transparency

• Since the very beginning of RD44,
• transparency of physics has always been an
  essential requirement and a distinctive
  characteristics of Geant4
• Is Geant4 faithful to the original spirit of its
  physics?
• We give priority to investing the available
  limited resources to make physics more
  transparent
• rather than to make it less transparent
• or to mask an intrinsic lack of transparency