Investigation of transverse-momentum-dependent functions (TMD) in azimuthal spin asymmetries of semi-inclusive deep inelastic nucleon scattering.

In der vorliegenden Arbeit wurden Strahlpolarisationsasymmetrien (BSA) in semi-inklusiver tief-inelastischen Streuung (SIDIS) für geladene Pionen, Kaonen, Protonen und Antiprotonen berechnet. Die analysierten Daten wurden am HERMES Experiment von 1996-2007 mit longitudinal polarisierten Elektronen/Positronen, die an Protonen oder Deuteronen gestreut wurden, gesammelt. Die hier vorgestellte Analyse baut auf bereits veröffentlichte Ergebnisse auf. Die Übereinstimmung mit den früher veröffentlichten Ergebnissen sowie die unabhängige Überprüfung jedes Analyseschrittes untermauert die Genauigkeit dieser Arbeit.In this work the beam single spin asymmetries (BSA) in SIDIS were extracted for charged pions, charged kaons and (anti)protons. The analyzed data was collected at the HERMES experiment during the years 1996-2007 with a longitudinally polarized beam on hydrogen and deuterium targets. The here presented analysis extends previously published results. The coincidence of newly extracted results with previously published results and the independent crosscheck of each step of analysis confirms the accuracy of this work

Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets

A measurement of beam-helicity asymmetries for single-hadron production in deep-inelastic scattering is presented. Data from the scattering of 27.6 GeV electrons and positrons off gaseous hydrogen and deuterium targets were collected by the HERMES experiment. The asymmetries are presented separately as a function of the Bjorken scaling variable, the hadron transverse momentum and the fractional energy for charged pions and kaons as well as for protons and anti-protons. These asymmetries are also presented as a function of the three aforementioned kinematic variables simultaneously