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Purpose

the DIRC provides

  • a positive kaon identification
  • a destinction of gammas and relativistic charged particles entering the EMC behind him

Working principle

  • Cherenkov Detector
  • determination of the mass of the particle by combining his velocity information with momentum information from the tracking detectors

Important values

  • Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls (Ref. TPR):

Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls.

  • the barrel DIRC covers the solid angle of 22 to 140 degrees
  • the lower momentum threshold for kaons which produce Cherenkov light is for an envisaged refractive index of n=1.47 as low as 460 MeV/c (for single photon producton -- for photon numbers bigger than 4 it is more than 200 MeV/c higher)

Topic attachments
I Attachment Action Size Date Who Comment
kkgamma.gifgif kkgamma.gif manage 61.4 K 19 Apr 2006 - 13:50 GeorgSchepers Polar angle vs. momentum distribution of the kaons in radiative decays of resonances in formation experiments like J/psi -> K+K- gamma for the search of glue-balls.
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Topic revision: r3 - 19 Apr 2006, GeorgSchepers
 
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