- LHCb
The LHCb (standing for "
Large Hadron Collider beauty" where "beauty" refers to thebottom quark ) experiment is one of six particle physics detector experiments built on the Large Hadron Collider accelerator atCERN . LHCb is a specialistb-physics experiment, particularly aimed at measuring the parameters ofCP violation in the interactions of b-hadron s (heavy particles containing abottom quark ).The LHCb detector
The fact that both B hadrons are predominantly produced in the same forward cone as
B meson production is exploited in the layout of the LHCb detector. The LHCb detector is a single arm forward spectrometer with a polar angular coverage from 10 to 300 milliradians (mrad) in the horizontal and 250 mrad in the vertical plane. Theasymmetry between the horizontal and vertical plane is determined by a largedipole magnet with the main component in the vertical direction.The vertex
detector (known as the vertex locator orVELO ) is built around the proton interaction region. It is used to measure the particle trajectories close to the interaction point in order to precisely separate primary and secondary vertices, e.g. forB-tagging .The
RICH-1 detector (Ring imaging Cherenkov detector ) is located directly after the vertex detector. It is used forparticle identification of low-momentum tracks.The main tracking system is placed before and after the dipole magnet. It is used to reconstruct the trajectories of charged particles and to measure their momenta.
Following the tracking system is
RICH-2 . It allows the identification of the particle type of high-momentum tracks.The
electromagnetic andhadron ic calorimeters provide measurement of theenergy ofelectrons ,photons , andhadrons . These measurements are used at trigger level to identify the particles with high transversal moment (high-Pt particles).The muon system is used to trigger on
muons in the events.ee also
*
*Large Hadron Collider External links
* [http://lhcb-public.web.cern.ch/lhcb-public/ LHCb Public Webpage]
* [http://www.uslhc.us/What_is_the_LHC/Experiments/LHCb LHCb section from US/LHC Website]
* (Full design documentation)
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