MCRichHit

Class Summary

The output of Gauss, representing the photo-electron hit on the HPD silicon wafer. Data members are

• Hit point (entry) on the silicon. Note the exit point is not stored as it has no meaning.

• Time of flight.

• The energy the photo-electron deposited.

• Smart Reference to the associated MCParticle. In most cases this is the MCParticle which traverse the radiator medium, which radiated a Cherenkov photon which subsequently hit the HPD entrance window causing the photo-electron which was ultimately detected by the HPD silicon wafer. However, In some cases a charged particle can directly hit the HPD entrance window causing a shower of photo-electrons, and in these cases the Smart Reference points to this MCParticle.

• A bit packed 32bit integer containing information on the history of the hit, such as whether it was produced by a Cherenkov hit or a charged track, or which radiator the hit came from (needed in RICH1 for example, to distinguish aerogel and C4F10 hits).

Doxygen Documentation

http://lhcb-release-area.web.cern.ch/LHCb-release-area/LHCB/doc/html/class_m_c_rich_hit.html