Elke-Caroline Aschenauer

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1 Abstract Polarized leptoproduction of charm is an experimentally completely unexplored and theoretically very interesting topic. Of particular interest in this area is the potential sensitivity of the polarization asymmetry to the contribution of the gluons to the nucleon spin. The present HERMES spectrometer is far from optimal for detecting the most(More)
Production and decay angular distributions were extracted from measurements of exclusive electroproduction of the ρ 0 (770) meson over a range in the virtual photon negative four-momentum squared 0.5 < Q 2 < 4 GeV 2 and the photon-nucleon invariant mass range 3.8 < W < 6.5 GeV. The experiment was performed with the Hermes spectrometer, using a(More)
The performance of a scintillating fiber detector prototype for tracking under high rate conditions is investigated. A spatial resolution of about 100 µm is aimed for the detector. Further demands are low occupancy and radiation hardness up to 1 Mrad/year. Fibers with different radii and different wavelengths of the scintillation light from different(More)
Rapidity-odd directed flow (v1) measurements for charged pions, protons, and antiprotons near midrapidity (y=0) are reported in sNN=7.7, 11.5, 19.6, 27, 39, 62.4, and 200 GeV Au+Au collisions as recorded by the STAR detector at the Relativistic Heavy Ion Collider. At intermediate impact parameters, the proton and net-proton slope parameter dv1/dy|y=0 shows(More)
We report the first measurements of the moments--mean (M), variance (σ(2)), skewness (S), and kurtosis (κ)--of the net-charge multiplicity distributions at midrapidity in Au+Au collisions at seven energies, ranging from sqrt[sNN]=7.7 to 200 GeV, as a part of the Beam Energy Scan program at RHIC. The moments are related to the thermodynamic susceptibilities(More)
A fiber detector concept has been realized allowing to registrate particles within less than 100 nsec with a space point precision of about 100 µm at low occupancy. Three full size prototypes have been build by different producers and tested at a 3 GeV electron beam at DESY. After 3 m of light guides 8-10 photoelectrons were registrated by multichannel(More)
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