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Measurement of TMDs in Semi-Inclusive DIS

Rainer JoostenUniversity of BonnCharlottesville, VA, October 7, 2008

R. Joosten, Oct. 7, 2008R. Joosten, Oct. 7, 2008Content of the talkSIDIS Experiments with transversely polarised target HERMES and COMPASS

Transverse momentum in SIDIS

ResultsUnpolarized cross section (Cahn effect, Boer-Mulders)Sivers Distribution FunctionTransversity Distribution Function, Collins FunctionOther TMD Distribution Functions ConclusionsR. Joosten, Oct. 7, 20082Perspective of the talkI will focus on SIDIS reactions in one photon exchange

Kinematical Variable:

Q2 = -q2 @ 4 E E' sin2/2 resolution n = (El El') photon energy xBj = Q2/2Mn momentum of the struck quark

z = Eh/n exclusivity

(E,k)(E',k')g* q=(n,q )leptonnucleon