Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-01-17
Physics
High Energy Physics
High Energy Physics - Experiment
9 pages, 4 figures, Plenary talk at the "16th International Spin Physics Symposium", October 10-16, 2004, Trieste, Italy; to b
Scientific paper
The COMPASS Experiment at the CERN SPS has a broad physics program focused on the nucleon spin structure and on hadron spectroscopy, using muon and hadron beams. Main objectives for the spin program with the muon beam are the direct measurement of the gluon contribution to the spin of the nucleon, semi-inclusive measurements, and the measurement of the transverse spin distribution $\Delta_T q$. The COMPASS apparatus consists of a two-stage large acceptance spectrometer designed for high data rates and equipped with high-resolution tracking, particle identification and electromagnetic and hadronic calorimetry. The data taking is ongoing since 2002 and till now was mainly devoted to the spin programme using a 160 GeV$/c$ naturally polarized, $\mu^+$ beam and a polarized \mrf{^6LiD} target. First physics results from the 2002 and 2003 runs are presented.
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