Gregor Siegert

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Quenched QCD simulations on three volumes, 83×, 123× and 163 × 32 and three couplings, β = 5.7, 5.85 and 6.0 using domain wall fermions provide a consistent picture of quenched QCD. We demonstrate that the small induced effects of chiral symmetry breaking inherent in this formulation can be described by a residual mass (mres) whose size decreases as the(More)
The Vehicle-Mounted Earth Stations (VMES) operation requirements defined by the regulatory authorities are bounding for terminal manufacturers. Testing the VMES for these requirements (e.g. pointing accuracy and polarization alignment) is therefore a necessity. The disadvantages of involving operational satellites and having fixed separation between them in(More)
A parallelizable SSOR preconditioning scheme for Krylov subspace iterative solvers in lattice QCD applications involving Wilson fermions is presented. In actual Hybrid Monte Carlo simulations and quark propagator calculations it helps to reduce the number of iterations by a factor of 2 compared to conventional odd-even preconditioning. This corresponds to a(More)
This work would start by describing OpenSDRM an open-source framework developed for the IST project MOSES., OpenSDRM is used to control the multimedia content consumption in conjunction with the new IPMPX MPEG-4 proposed standard. This architecture, composed by several building blocks, protects the content flow from creation to final user consumption on a(More)
The Vehicle-Mounted Earth Stations (VMES) operation requirements defined by the regulatory authorities are bounding for terminal manufacturers. Testing the VMES for these requirements (e.g., pointing accuracy and polarization alignment) is therefore a necessity. The disadvantages of involving operational satellites and having fixed separation between them(More)
In a full QCD lattice study with Nf = 2 Wilson fermions, we seek to optimize the signals for the disconnected contributions to the matrix element of flavoursinglet operators between nucleon states, which are indicative for sea quark effects. We demonstrate, in form of a fluctuation analysis to the noisy estimator technique, that – in order to achieve a(More)
In satellite-based systems, such as global navigation satellite systems (GNSS), the use of antenna arrays is becoming increasingly common, as it allows various applications, such as jammer/spoofer suppression or improving the positioning accuracy in multipath-environments. Testing such equipment under realistic and reproducible conditions is often not(More)
We report results of the first measurements of Λ and ¯ Λ polarization produced in deep inelastic polarized muon scattering on the nucleon. The results are consistent with an expected trend towards positive polarization with increasing x F. The polarizations of Λ and ¯ Λ appear to have opposite signs. A large negative polarization for Λ at low positive x F(More)
This paper discusses the advances and measurement results of a far field test range for SatCom On-the-Move terminals in Ilmenau, Germany. The test range can be operated in Ku and Ka-band, offering a complete emulation of the conditions typically met by a SOTM terminal. Various real-world motion profiles for the Land Mobile and Maritime environment are(More)
We present intermediate results on our ongoing investigation concerning semileptonic decays of heavy pseu-doscalar mesons into pseudoscalar and vector mesons. The corresponding formfactors are evaluated at several momenta and appropriate combinations of four light and four heavy quarks, which are chosen to allow for an extrapolation into the B Meson region.(More)