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The renormalization factor relating the bare to the renormalization group invariant quark masses is accurately calculated in quenched lattice QCD using a recursive finite-size technique. The result is presented in the form of a product of a universal factor times another factor, which depends on the details of the lattice theory but is easy to compute,… (More)

- Martin Lüscher, Stefan Sint, Rainer Sommer, Hartmut Wittig
- 1996

A finite-size technique is employed to compute the normalization constant Z A of the isovector axial current in lattice QCD. The calculation is carried out in the quenched approximation for values of the bare gauge coupling g 0 ranging from 0 to 1. In the lattice action and the lattice expression for the axial current we include the counterterms required… (More)

- Joyce Garden, Jochen Heitger, Rainer Sommer, Hartmut Wittig
- 1999

We determine the renormalization group invariant quark mass corresponding to the sum of the strange and the average light quark mass in the quenched approximation of QCD, using as essential input the mass of the K-mesons. In the continuum limit we find (M s + ˆ M)/F K = 0.874(29), which includes systematic errors. Translating this non-perturbative result… (More)

- Marco Guagnelli, Jochen Heitger, Rainer Sommer, Hartmut Wittig
- 1999

We explain how masses and matrix elements can be computed in lattice QCD using Schrödinger functional boundary conditions. Numerical results in the quenched approximation demonstrate that good precision can be achieved. For a statistical sample of the same size, our hadron masses have a precision similar to what is achieved with standard methods, but for… (More)

- Lars C. Wolf, Luca Delgrossi, Ralf Steinmetz, Sibylle Schaller, Hartmut Wittig
- NOSSDAV
- 1995

Resource management offers Quality-of-Service reliability for time-critical continuous-media applications. Currently existing resource management systems provide only means to reserve resources starting with the reservation attempt and lasting for an unspecified duration. However, for several applications such as video conferencing the ability to reserve… (More)

- Ronny Vogel, Ralf G. Herrtwich, Winfried Kalfa, Hartmut Wittig, Lars C. Wolf
- IEEE Journal on Selected Areas in Communications
- 1996

Continuous media such as audio and video require a certain quality of service (QoS) when transferred through computer networks. The selection of a network route for a particular media stream should hence take into account which route is best-suited for providing this QoS. QoSFinder is a method for QoS-based routing of multimedia streams. It is based on a… (More)

- Carsten Vogt, Lars C. Wolf, Ralf G. Herrtwich, Hartmut Wittig
- Multimedia Syst.
- 1998

Multimedia systems must be able to support a certain quality of service (QoS) to satisfy the stringent real-time performance requirements of their applications. HeiRAT, the Heidelberg Resource Administration Technique , is a comprehensive QoS management system that was designed and implemented in connection with a distributed multimedia platform for… (More)