One unresolved question in hadronic physics is the origin of large transverse single-spin asymmetries, AN, observed in hadron production from high-energy polarized-proton collisions. Collinear perturbative Quantum Chromodynamics (pQCD) predicts that AN should scale with the quark mass, however, experiments have since reported large AN for inclusive hadron production. Recent measurements from RHIC experiments show examples of these asymmetries at forward angles in a kinematic region where pQCD cross-section calculations reasonably agree with measured cross-sections. Disentangling dynamical contributions to AN from hadro-production requires moving beyond inclusive measurements. One possibility is to investigate asymmetries in two-particle correlations due to Interference Fragmentation Functions (IFF) and the Sivers effect. In 2008, RHIC dedicated a portion of the run to transversely polarized proton collisions at sqrt(s) = 200 GeV. STAR was equipped with a Foward Meson Spectrometer (FMS) and a Forward Time Projection Chamber (FTPC), overlapping in the pseudorapidity range of 2.5 < eta &lt; 4. By analyzing neutral pions with the FMS correlated with charged particles from the FTPC, correlation asymmetries can be measured at kinematics where large inclusive asymmetries have been measured. Correlations are measured for pi^0's with 2 &lt; pT, pi^0 &lt; 5 GeV/c and associated charged particles in two ranges of transverse momentum: 1 &lt; pT, ch &lt; 2 GeV/c and 0.5 &lt; pT, ch &lt; 1 GeV/c. IFF and Sivers asymmetries manifest themselves through the correlation of two particles from the same jet. These events are selected through a cut on the pair radius, delta R. Gain non-uniformities and electronics failures have resulted in large holes in trigger acceptance and associated particle acceptance, respectively. This non-uniform acceptance allows the Sivers and IFF effects to mix and distort the raw asymmetries. Techniques are developed to measure this leak-through by means of unpolarized yields and event weighting. They result in small corrections to the asymmetries. IFF and Sivers asymmetries both for xF > 0 and for xF &lt; 0 are reported for forward-angle pi^0-charged particle correlations from polarized-proton collisions at sqrt(s) = 200 GeV. Asymmetries are shown corrected for full underlying-event and pileup backgrounds, as well as corrected only for pile-up contributions. It appears the asymmetries are less sensitive to delta R when corrected for the full underlying-event background. Unfortunately, statistics limitations preclude a firm conclusion.

Inaug.-Diss.--Königsberg i. Pr., 1933. / eContent provider-neutral record in process. Description based on print version record. "Literaturverzeichnis": p. vii-xi; "Die Schriften von Jegor v. Sivers": p. 89-103.

Inaug.-Diss.--Königsberg i. Pr., 1933. / "Literaturverzeichnis": p. vii-xi; "Die Schriften von Jegor v. Sivers": p. 89-103.

The essay deals with the early archaeology in Sweden during the 17th and 18th centuries in generally and with Henric Jacob Sivers excavations at Skrickerum in particularly. In the medieval, Christian Sweden, the relics from the antiquity was considered merely as symbols of the heathen past  but with the foundation of Sweden as a united kingdom they awoke interest as symbols for the nation and were used as tools in the nation building. The interpretation of the antiquity and the ancient relics where done with the Bible and the ancient writers of Greece and Rome as guides and sources. With the new scientific approach, inspired by the Enlightenment, the Swedish antiquity and its relics gained other meanings and understandings and during the early 19th century Swedish archaeology developed into a scientific subject. The aim of this essay is to retain a deeper understanding for how Swedish antiquity was looked upon during the period between the Renaissance and 1800 among scholars of the time. What similarities and differences can be spotted in a comparison with archaeology of today? Due to this, the essay concentrate on a few, selected scholars from each century and takes a look at questions like; what was considered antiquities, how where they interpreted and what part did the Christianity, and later on the Enlightenment, play in the view upon Sweden´s ancient past. In order to find answers on a broader and deeper level, the essay makes a detailed study of excavations performed by Henric Jacob Sivers at Skrickerum, Östergötland in 1757. Sivers, who was a priest and a scholar born and educated in Germany, was inspired by the new scientific view and very interested in the ancient past, he collected antiques and called himself “fornälskare”, antique lover. The excavations at Skrickerum took place during two days in June 1757 and Sivers documented the work rather thoroughly in his publication Berättelse om några nyligen i Tryserums Sokn, Tiust Härad och Calmare Län, öpnade hedniska Grafhögar och the theruti fundna Saker (Sivers 1758). How were these excavations conducted and how did they differ from excavations of today, in theoretical, methodical and conductional aspects? Sivers’ publication will give the answers and help us get a glimpse of Swedish archaeology in its early state.

What constitutes the spin of the nucleon? The answer to this question is still not completely understood. Although we know the longitudinal quark spin content very well, the data on the transverse quark spin content of the nucleon is still very sparse. Semi-inclusive Deep Inelastic Scattering (SIDIS) using transversely polarized targets provide crucial information on this aspect. The data that is currently available was taken with proton and deuteron targets. The E06-010 experiment was performed at Jefferson Lab in Hall-A to measure the single spin asymmetries in the SIDIS reaction n↑(e,éπ±/K±)X using transversely polarized 3He target. The experiment used the continuous electron beam provided by the CEBAF accelerator with a beam energy of 5.9 GeV. Hadrons were detected in a high-resolution spectrometer in coincidence with the scattered electrons detected by the BigBite spectrometer. The kinematic coverage focuses on the valence quark region, x = 0.19 to 0.34, at Q2 = 1.77 to 2.73 (GeV/c)2. This is the first measurement on a neutron target. The data from this experiment, when combined with the world data on the proton and the deuteron, will provide constraints on the transversity and Sivers distribution functions on both the u and d-quarks in the valence region. In this work we report on the single spin asymmetries in the SIDIS n↑(e,éπ+)X reaction.

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