Polarizing a stored proton beam by spin-flip [Elektronische Ressource] / vorgelegt von Dieter Gerd Christian Oellers

Polarizing a Stored Proton Beam bySpin-Flip?Inaugural-DissertationzurErlangung des Doktorgradesder Mathematisch-NaturwissenschaftlichenFakult¨atder Universit¨at zu K¨olnvorgelegt vonDieter Gerd Christian Oellersaus Ju¨lichJu¨lich, 2010Berichterstatter: Prof. Dr. H. Str¨oherProf. Dr. J. JolieTag der mu¨ndlichen Pru¨fung: 15. April 2010fu¨r SilviaAbstractThe present thesis discusses the extraction of the electron-proton spin-flip cross-section.The experimental setup, the data analysis and the results are pictured in detail.The proton is described by a QCD-based parton model. In leading twist three func-tions are needed. The quark distribution, the helicity distribution and the transversitydistribution. While the first two are well-known, the transversity distribution is largelyunknown. A self-sufficient measurement of the transversity is possible in double polarizedproton-antiproton scattering. This rises the need of a polarized antiproton beam.So far spin filtering is the only tested method to produce a polarized proton beam,which may be capable to hold also for antiprotons. In-situ polarization build-up of a1stored beam either by selective removal or by spin-flip of a spin- beam is mathematically2described. A high spin-flip cross-section would create an effective method to produce apolarized antiproton beam by polarized positrons.