This contribution reports on a proof‐of‐principle measurement of the longitudinal spin transfer DLL in inclusive Λ and Λ̄ production in polarized proton‐proton collisions at a center of mass energy s = 200 GeV. The data sample consists of about 3 × 106 minimum bias events collected in the year 2005 by the STAR experiment at RHIC with proton beam polarizations of up to 50%. The Λ(Λ̄) candidates are reconstructed at mid‐rapidity (|η| < 1) using the STAR Time Projection Chamber via the dominant decay channel Λ → pπ (Λ̄ → π+). Their mean transverse momentum pT is about 1.3 GeV/c and longitudinal momentum fraction xF = 7.5 × 10−3. The longitudinal Λ(Λ̄) polarization is determined using a method in which the detector acceptance mostly cancels.

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