A Fundamental Test of Universality: Transverse Spin Drell Yan at RHIC vs Sivers Asymmetry in Deep...
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A Fundamental Test of Universality: Transverse Spin Drell Yan at RHIC vs Sivers Asymmetry in Deep Inelastic Scattering • Important test at RHIC of recent fundamental QCD predictions for the Sivers effect, demonstrating… attractive vs repulsive c o l o r charge forces ---------------- • Possible access to quark orbital angular momentum • Requires very high luminosity (RHIC II) • Both STAR and PHENIX can make important, exciting, measurements • Discussion available at http://spin.riken.bnl.gov/rsc/
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Transcript of A Fundamental Test of Universality: Transverse Spin Drell Yan at RHIC vs Sivers Asymmetry in Deep...
A Fundamental Test of Universality:Transverse Spin Drell Yan at RHIC vs
Sivers Asymmetry in Deep Inelastic Scattering
• Important test at RHIC of recent fundamental QCD predictions for the Sivers effect, demonstrating… attractive vs repulsive color charge forces
----------------• Possible access to quark orbital angular momentum
• Requires very high luminosity (RHIC II)
• Both STAR and PHENIX can make important, exciting, measurements
• Discussion available at http://spin.riken.bnl.gov/rsc/
DIS: attractive Drell-Yan: repulsive
Attractive vs Repulsive “Sivers” EffectsUnique Prediction of Gauge Theory !
Sivers = Dennis Sivers (predicted orbital angular momentum origin of transverse asymmetries)
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Experiment SIDIS vs Drell Yan: Sivers|DIS= − Sivers|DY
*** Probes QCD attraction and QCD repulsion ***
HERMES Sivers Results RHIC II Drell Yan Projections
Markus DiefenthalerDIS WorkshopMunich, April 2007
