From the US/LHC Blog: Anna Phan on using the VELO

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Anna Phan

“Today’s post is a continuation of my description of the LHCb detector. From my other post on identifying vertices using the VELO, we naturally progress to tracking charged particles. As I mentioned in my first post, the VELO along with the TT, T1, T2, and T3 stations are used to reconstruct particle tracks inside LHCb.

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LHCb experiment

Particle tracking is somewhat akin to animal tracking. The first thing you need is some material where particle tracks will leave a trace. It is very hard to find animal tracks on concrete, but very easy on sand or snow…This where the VELO along with the TT, T1, T2 and T3 come in. When charged particles pass though these detector components, they leave hits. Two different types of technology are used to measure particle interactions. The VELO, TT and the inner sections of the T stations are made of layers of silicon strips while the outer sections of the T stations consist of straw tubes filled with a mixture of argon and carbon dioxide gas. ”

O.K., enough to wet your whistle. For the rest, read what Anna has to say and view her graphics here.