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)

FIRST Estimations:

  • Single Photon Cherenkov Angle Resulution

    • with a DIRC-Bar size of 17x30x2000mm, a distance of l=1.20m of the photomultipiers from the bar exit and a diameter of the photomultiplier cathods of 2cm ( beeing equal to the distance of the centers of the cathods) the geometric contribution of the Single Photon Cherenkov Angle Resulution can be calculated

    • to this geometric contribution the resolution contribution (comming from the production and the transmission dispersion) has to be added which has a values of similar size

-- GeorgSchepers - 20 Apr 2006

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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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