München 2006 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 28: Elektromagnetische und Hadronische Sonden
HK 28.4: Talk
Wednesday, March 22, 2006, 14:45–15:00, F
Measurement of the Transverse Hyperon Polarization at COMPASS — •B. Grube, J.M. Friedrich, A.-M. Dinkelbach, S. Gerassimov, B. Ketzer, I. Konorov, R. Kuhn, S. Paul, L. Schmitt, Q. Weitzel, and M. Wiesmann — TU München, Physik Department E18
COMPASS has measured the transverse polarization of Λ, 4mu −4mu Λ, Ξ−, and 4mu −4mu Ξ −0.5mu 0.5mu+ hyperons in quasi-real photo-production using a 160 GeV/c muon beam from the CERN SPS.
Utilizing the self-analyzing weak decay of the hyperons, their polarization was determined from the up-down asymmetry of the angular distribution of the respective decay baryons with respect to the production plane. Acceptance effects were reduced by applying bias-canceling methods that exploit the mid-plane symmetry of the apparatus. We have evaluated the polarization in different kinematical regions of the longitudinal momentum fraction xF of the hyperons and their transverse momentum pT.
This work is supported by the BMBF and the Maier-Leibnitz-Labor, Garching.