Yellow Report Complementarity

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Charge of the Complementarity Detector YR WG

The WG is supposed to develop the arguments for two complementarity detectors. Complementarity is not only with respect to the detector but also include the IR design. The arguments will be developed with strong input from the physics and detector YR WG


Questions to be addressed by WG to define Complementarity

Physics WG

  • Which physics processes have contradictory requirements not possible to consolidate in one detector
  • What physics processes need a dedicated detector / cannot be fulfilled by a general- purpose detector
  • Is the large rapidity acceptance (|eta| 3-4) critical for your physics? Any problems if the focusing quadrupoles would be inside the detector volume
  • What is the absolute best detector performance you would like to see and what is the detector performance you anticipate your physics not be possible anymore
  • Can you briefly summarize your planned physics program in terms of processes of interest and (where applicable) basic kinematic ranges in (x,Q2) or other relevant variables.
  • Which basic detector-level measurements (eg track pT/eta, scattered electron, forward neutron/proton observables, overall HFS, displaced vertices, dE/dx ...) are most essential to realise your physics aims? Can you already say what sort of measurement (acceptance) ranges and resolutions / performance you need?
  • For charged particles, how important is low momentum acceptance versus high momentum resolution (this informs the optimal choice of magnetic field). What is the sensitivity to the magnitude of the magnetic field.
  • How important is integrated luminosity? For the anticipated integrated luminosities, will your observable be systematic or statistics-limited? If you expect to be systematically limited, which systematic source (or sources) are the most important?
  • How important is polarisation to your physics programme (quantify if possible, in terms of polarisation level and systematic precision requirements)? If applicable, discuss lepton and hadron polarization separately.
  • What beam energies are ideal for your physics aims (quantify if possible)?
  • How important is the Interaction Region design for your physics observable and do you have criteria that might impact the design? For example, would you be impacted by reduced forward acceptance for neutrons, protons, photons?
  • What is the sensitivity of your physics to the lower y-cut and the depolarization factor
Detector WG
  • Are there any limitations in the performance of a certain sub detector technology for very small bunch spacing < 9ns
  • Is +/- 4.5 m enough to fit the detector
  • document performance of different subdetector technologies to understand their complementarity
    • resolution
    • material budget
    • radiation hardness
    • cost and time to construct the subdetector
    • how much longer till the technology is ready for mass production or is it shovel ready
    • what drives the systematics of a subdetector using a specific technology
    • any rate limitations