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Drell -Yan @ COMPASS

Drell -Yan @ COMPASS. Large angular acceptance spectrometer SPS M2 secondary beams with the intensity up to 10 8 particles per second Transversely polarized solid state proton target high polarization large relaxation time

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Drell -Yan @ COMPASS

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  1. Drell-Yan @ COMPASS • Large angular acceptance spectrometer • SPS M2 secondary beams with the intensity up to 108 particles per second • Transversely polarized solid state proton target • high polarization • large relaxation time • Detection system can withstand relatively high particle fluxes • Dedicatedmuon trigger system • Data Acquisition System can handle large amounts of data with high trigger rates

  2. Beam Test 2009 (*)normalized to beam test flux 3.7x1011

  3. Projected Observables • High mass region • 4.0 < Mµµ < 9.0 GeV/c2 • Important comparison with SIDIS in overlapping kinematic range

  4. Projected Observables • Medium mass region • 2.0 < Mµµ < 2.5 GeV/c2

  5. DY@COMPASS Setup π- 190 GeV Key elements: • COMPASS PT • Tracking system (both LAS abs SAS) and beamtelescope in front of PT • Muon trigger (in LAS is of particular importance,60% of the DY acceptance) • RICH1, Calorimetry – also important to reduce the background (the hadron flux downstream of the hadron absorber ~ 10 higher then muon flux)

  6. Kinematics • π- p  μ- μ X • 190 GeV pion beam • Contribution from valence quarks is dominant • In COMPASS kinematics u-ubar dominance • <PT> ~ 1GeV – TMDs induced effects expected to be dominant with respect to the higher QCD corrections

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