Luminosity measurement at LHCb

par M. Vladik Balagura (ITEP & CERN)

mardi 2 févr. 2010, 11:00 → 12:00 US/Central

Salle 101 (LAL - Orsay)

The relative luminosity in LHCb is monitored in the randomly triggered events with quantities easily measurable online and proportional to the instantaneous luminosity, like the number of tracks or vertexes, occupancies, transverse energy deposition in the calorimeter. The information is stored in a very condensed format in a dedicated data stream. The absolute luminosity is measured using pp -->ZX --> µ+µ−X and two-photon pp --> µ+µ−pp reactions with known cross- sections, van der Meer separation scan and, finally, by studying beam profiles measured with beam- gas interactions. The first results on LHC beam parameters obtained with LHCb December beam-gas data will be reported.

Minutes balagura.pdf

Poster SemV.Balagura.pdf