Asymptotic scaling corrections in QCD with Wilson fermions from the 3-loop average plaquette

We calculate the 3-loop perturbative expansion of the average plaquette in lattice QCD with N_f massive Wilson fermions and gauge group SU(N). The corrections to asymptotic scaling in the corresponding energy scheme are also evaluated. We have also improved the accuracy of the already known pure gluonic results at 2 and 3 loops.Comment: 11 pages and 1 ps figure divided in two sheets; corrected tables V, VI and eq.(19

Influence of the Dzyaloshinskii-Moriya exchange interaction on quantum phase interference of spins

Magnetization measurements of a Mn12mda wheel single-molecule magnet with a spin ground state of S = 7 show resonant tunneling and quantum phase interference, which are established by studying the tunnel rates as a function of a transverse field applied along the hard magnetization axis. Dzyaloshinskii-Moriya (DM) exchange interaction allows the tunneling between different spin multiplets. It is shown that the quantum phase interference of these transitions is strongly dependent on the direction of the DM vector.Comment: 5 pages, 5 figure

The internet and public–private governance in the European Union

The EU plays a significant role in public policy aspects of Internet governance, having created in the late 1990s the dot eu Internet Top Level Domain (TLD). This enables users to register names under a European online address label. This paper explores key public policy issues in the emergent governance system for dot eu, because it provides an interesting case of new European transnational private governance. Specifically, dot eu governance is a reconciliation resulting from a governance cultural clash between the European regulatory state and what can be described broadly as the Internet community. The EU has customised the governance of dot eu towards a public–private dispersed agencification model. The paper extends the evidence base on agencification within trans-European regulatory networks and the emergence of private transnational network governance characterised by self-regulation