8 M ay 2 00 8 On ortho - positronium and gauge

ar X iv : h ep - p h / 02 05 07 9 v 1 8 M ay 2 00 2 CONSTRUCTING CONFINEMENT

The interaction between static quarks is derived by applying many-body techniques to QCD in Coulomb gauge. The result is shown to be exact in the IR and UV limits, and agrees remarkably well with lattice computations.

ar X iv : h ep - p h / 98 05 42 4 v 1 2 2 M ay 1 99 8 Potential NRQED : The Positronium Case

We discuss in detail potential NRQED (pNRQED), a previously proposed effective field theory for ultrasoft photons. The pNRQED lagrangian for the equal mass case is presented and it is shown that it correctly reproduces the positronium spectrum at order mα5. The pNRQED lagrangian for the unequal mass case is also presented at the same order. Dimensional regularization is used throughout.

Can the mirror world explain the ortho - positronium lifetime puzzle ?

We suggest that the discrepant lifetime measurements of ortho-positronium can be explained by ortho-positronium oscillations into mirror ortho-positronium. This explanation can be tested in future vacuum experiments. [email protected] [email protected] A “mirror universe” is predicted to exist if parity and/or time reversal are unbroken symmetries of nature [1,2]. The idea is th...

2 8 M ay 2 00 7 Remarks on the existence of bilaterally symmetric

ar X iv : h ep - t h / 05 05 16 9 v 1 1 8 M ay 2 00 5 Manifestly gauge invariant QED

We uncover a method of calculation that proceeds at every step without fixing the gauge or specifying details of the regularisation scheme. Results are obtained by iterated use of integration by parts and gauge invariance identities. Calculations can be performed almost entirely diagrammatically. The method is formulated within the framework of an exact renormalisation group for QED. We demonst...