Negrini, Teresa: Transverse Λ polarization from a transversely polarized proton target at the COMPASS experiment. - Bonn, 2010. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
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author = {{Teresa Negrini}},
title = {Transverse Λ polarization from a transversely polarized proton target at the COMPASS experiment},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2010,
month = feb,

note = {The measurement of the transverse spin quark distribution functions ΔTq(xBj) is an important part of the physics program of the COMPASS experiment at CERN. These transversity distributions, being chiral-odd objects, are not accessible in inclusive deep-inelastic scattering (DIS), requiring the presence of another chiral-odd object. At COMPASS, ΔTq(xBj) can be measured in semi-inclusive deep-inelastic scattering (SIDIS), where a promising channel is the spin transfer to the Λ hyperons. Here, the fragmentation functions ΔTDΛq(z) provide the other chiral-odd object. In this thesis, the semi-inclusive Λ production mechanism is introduced to show the connection between a potentially measured Λ polarization PΛ and the ΔTq(xBj) functions. An expression for the angular distribution of the weak decay Λ → pπ- is used which allows to extract PΛ independent of acceptance effects of the spectrometer. In 2007 a 160 GeV/c longitudinally polarized muon beam and a transversely polarized NH3 target were employed in the COMPASS experiment. Based on the full 2007 statistics with transverse target spin configuration, the Λ and anti-Λ polarizations are analyzed as a function of xBj and z. The Λ and anti-Λ hyperons are unpolarized within their statistical errors and show no dependence on either xBj or z.

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