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How to measure polarization components of proton in γp→πp

  1. Jun 10, 2012 #1
    Dear all,

    I have a question about the polarization measurement.

    In the photo production reaction like γp→πp with polarized photon beam of energy GeV. how to measure the polarized components of proton. A paper said that the focal plane polarimeter, consisting of two 55 cm CH2 analyzer blocks, each followed by a pair of drift chambers, measured the asymmetry of the charged particles in p+CH2 -> charged particle + X to extract the proton polarization.

    I don't understand why CH2 can be used and how the polarization works.

    Please help me!
     
  2. jcsd
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