Das LHCb Experiment (LargeHadronColliderbeauty Experiment) ist eines der vier großen Experiment (ALICE, ATLAS, CMS, LHCb) am CERN, die am neuen 27 km langen LHC stationiert sind. Der Eingang zum Experiment liegt in Ferney-Voltaire in Frankreich. In der LHCb Kollorbaration arbeiten 690 Mitglieder aus 15 Ländern. Die gesamte Technik ist 100 m unter der Oberfläche und wiegt 5600 t. Die meisten Arbeiten am Detector waren 2007 abgeschlossen.

Winkelverteilung der Ereignisse am LHCb. Die meisten Ereignisse passieren den detector nahe des LHC Teilchenstrahls.

The LHCb detector will make precision measurements of the standard modell of particle physics by measuring the properties of B mesons. Allmost all interesting Events happen along the foreward and backward direction. It will only be measured in foreward direction to use the space in the subterranean caverne in an optimal way. That is the reason why the LHCb has been constructed as a foreward spectrometer, which measures events in an area between 15 and 300 mrad.

The detector is about 21 meters long, 10 meters in height and 13 meters in width. Despite its enormous dimensions the LHCb is rather small compared to its collegues. Because of its special design it consists of some compnents, which can not be found at any other LHC experiment. The luminosity for the LHCb can be adjusted at the LHC between 2 and 5 *1032cm-2s-1. The interaction rate is approximatly 10MHz. That means that 105 b events per second are expected. The ratio between the different hadrons is
B0 : B+- : Bs : &Lambdab &asymp 0.8 : 0.8 : 0.2 : 0.2. In a B meson event there will be approxiamtly 30 charged tracks with the highest track density just around the beam axis. To reconstruct those tracks very sensitive instruments are needed. The LHCb reaches a momentum resulution of better than 1% and a resolution in the impact parameter of better than 50μm.