Aschenauer Abstract

One of the main scientific questions that remain unanswered in subatomic physics is the nature and behavior of the “glue” which holds the quarks together. The newly proposed Electron Ion Collider is a new high-energy and high-luminosity electron-ion/proton machine @ BNL, which will provide unprecedented access to study deeply the nature of QCD matter and strong color fields. Nuclei will be probed in deep inelastic scattering and diffractive processes in the high-energy regime this opens a new window into fundamental questions in QCD, like the exploration of gluon saturation. An other fundamental question after the individual parton (quarks and gluons) contributions to the spin of the nucleon is even after 20 years of experimental efforts not yet solved. After several precise measurements in polarized DIS it is clear, that the spin of the nucleon cannot be explained by the contribution of the quarks alone. Measurements from the polarized pp-collider RHIC show that also the contribution from gluons is smaller than originally expected. The size of the orbital angular momentum of quarks and gluons is even completely unknown. At the EIC it will not only be possible to study all these contributions to the spin of the nucleon with unseen precision, but more importantly we will be able to give answers on the nucleon spin quest.  

Klukas Abstract

The observation of associated production of W and Z bosons at the LHC will provide not only a better measurement of triple gauge boson couplings in the Standard Model, but also a probe for various new physics models. I will discuss the prospects to search for new models using the trilepton final state of WZ production, focusing on results from a Monte Carlo simulation of a modern Technicolor model.

Katich Abstract

Experiment E07-013 at Jefferson Lab has recently completed a measurement of a target single-spin asymmetry, A_yⁿ, in the deep inelastic kinematic region using a 6 GeV electron beam and 40 cm polarized ³He target. This asymmetry provides a direct observable of two-photon physics, which has been shown to be capable of resolving the discrepancy between Rosenbluth and polarization-transfer methods of measuring the ratio μG_E/G_M. The goal of the experiment was to improve the upper limit of A_yⁿ by better than an order of magnitude compared with SLAC proton data collected over 35 years ago. A non-zero result would be a sign of chiral symmetry breaking that is beyond the leading twist QCD picture of DIS. An experimental overview including analysis progress will be reported.