We describe several techniques for the calculation of multi-loop integrals and their application to heavy quark current correlators. As new results, we present the fourloop correction to the second and third physical moment in the low-energy expansions of vector, axial-vector and scalar quark current correlators. Using a Ward identity, we obtain the third and fourth moment for the pseudo-scalar...

We determine the mass of the lightest q̄q scalar meson with I = 1 using the simulation with two dynamical Domain Wall Fermions. The conventional exponential fit of the scalar correlator is justified in this case giving the mass 1.58± 0.34 GeV. In general the scalar correlator receives also the bubble contribution, which is the intermediate state with two pseudoscalar mesons. This contribution is...

The SFXC software correlator has become the primary correlator for the EVN. Due to its nature a software correlator is much more flexible than a hardware solution, greatly simplifying the development of new correlator features. SFXC offers a number of new features which were not previously available to EVN users. These new features include: Pulsar binning and gating, multiple simultaneous phase...

The evaluation of field theoretic correlators at strong couplings is especially interesting in the light of recently discovered string/field theory correspondences. We present a calculation of the stress-tensor correlator in N = 1 SYM theory in 2+1 dimensions. We calculate this object numerically with the method of supersymmetric discrete light-cone quantization (SDLCQ) at large Nc. For small d...

This paper presents a single correlator RAKE receiver for direct sequence code division multiple access (DS-CDMA) systems. In conventional RAKE receivers, multiple correlators are used to despread the multipath signals and then to align and combine those signals in a later stage before making a bit decision. The simplified receiver structure presented here uses a single correlator and single co...

In the first memo of this series [1], a number of simulations were performed with the primary goal of quantifying the performance of the proposed WIDAR correlator compared to an ideal correlator operating at the full bandwidth. These simulations demonstrated that the WIDAR correlator yields satisfactory results. It was also stated and demonstrated that the WIDAR correlator could increase the sp...

In ultra-wideband (UWB) channels, the signal energy in the acquisition receiver spreads over correlator outputs due to rich multipaths, making the output of each correlator have only a small portion of the total energy. To enhance the acquisition performance for UWB signals by exploiting the signals spread over a number of correlator outputs, this paper proposes a two-stage acquisition scheme. ...