ar X iv : h ep - t h / 06 04 11 3 v 1 1 6 A pr 2 00 6 Dispersive calculation of the massless multi - loop sunrise diagram

ar X iv : h ep - t h / 06 04 11 3 v 2 2 M ay 2 00 6 Dispersive calculation of the massless multi - loop sunrise diagram

The massless sunrise diagram with an arbitrary number of loops is calculated in a simple but formal manner. The result is then verified by rigorous mathematical treatment. Pitfalls in the calculation with distributions are highlighted and explained. The result displays the high energy behaviour of the massive sunrise diagrams, whose calculation is involved already for the two-loop case.

ar X iv : h ep - p h / 05 04 04 2 v 1 6 A pr 2 00 5 Strong interactions at all density

We show using Mean Field Theory that the phase diagram of QCD at finite density (T = 0) is such that chiral symmetry remains spontaeously broken at all density! Talk given at the Recontres Vietnam, Hanoi, August 2004

ar X iv : h ep - p h / 01 11 04 9 v 1 6 N ov 2 00 1 The QCD Phase Diagram and Explosive Astrophysics

ar X iv : h ep - t h / 06 11 11 6 v 1 1 0 N ov 2 00 6 Gauged System Mimicking the Gürsey Model

We comment on the changes in the constrained model studied earlier when constituent massless vector fields are introduced. The new model acts like a gauge-Higgs-Yukawa system, although its origin is different. PACS 11.10.-z, 12.60.Rc

ar X iv : h ep - p h / 06 04 13 0 v 1 1 4 A pr 2 00 6 The αα 2 s corrections to the first moment of the polarized virtual photon structure function

We present the next-to-next-to-leading order (αα s) corrections to the first moment of the polarized virtual photon structure function g 1 (x,Q , P ) in the kinematical region Λ ≪ P 2 ≪ Q, where −Q(−P ) is the mass squared of the probe (target) photon and Λ is the QCD scale parameter. In order to evaluate the three-loop-level photon matrix element of the flavor singlet axial current, we resort ...