Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Hadronenstruktur und -spektroskopie X

HK 64.5: Vortrag

Freitag, 19. März 2010, 15:15–15:30, HG III

Transverse Λ and Λ polarization with a transversely polarized proton target at COMPASS* — •DONGHEE KANG — Institut für Kernphysik, Johannes Gutenberg Universität Mainz, D-55099 Mainz

The measurement of the transverse quark distribution functions ΔTq(x) is an important part of the physics program of the COMPASS experiment at CERN. The transversity distributions, being chiral-odd objects, are not directly accessible in inclusive deep-inelastic scattering (DIS), but require the presence of another chiral-odd object. They can be measured in semi-inclusive deep-inelastic scattering (SIDIS), where this additional object is provided by the transversely polarized fragmentation functions ΔTDqh (z). The most promising channels for the measurement of the transversity distributions in SIDIS are the Collins effect, the azimuthal asymmetries in two hadrons production and the transverse Λ polarization. The transverse Λ and Λ polarization can be studied by measuring the acceptance corrected angular distribution of its decay products. At COMPASS, the data on the Λ and Λ hyperons produced in SIDIS processes have been collected in 2007, using a beam of 160 GeV/c polarized µ+ scattering off a NH3 target. The preliminary results on the transverse Λ and Λ polarization as a function of xBj and z will be presented.
* This work is supported by the BMBF.

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