ar X iv : h ep - t h / 06 02 17 7 v 1 18 F eb 2 00 6 Relativistic particle dynamics in D = 2 + 1 .

ar X iv : h ep - p h / 06 02 02 0 v 1 2 F eb 2 00 6 Automated Resummation and Hadron Collider Event Shapes ∗

whereHmn are numerical coefficients and we have introduced the shorthand L ≡ ln 1/v. The double logarithms are associated with non-cancellation between soft and collinear divergences in real and virtual graph, since limiting v suppresses real radiation but not the corresponding virtual terms. When v is small (ln v ∼ α s ) all terms αs L 2m become of the same magnitude (∼ 1) and reliable calcula...

ar X iv : h ep - t h / 06 03 15 5 v 1 2 0 M ar 2 00 6 Quantum Field Theory : Where We Are

We comment on the present status, the concepts and their limitations, and the successes and open problems of the various approaches to a relativistic quantum theory of elementary particles, with a hindsight to questions concerning quantum gravity and string theory.

ar X iv : a st ro - p h / 99 02 06 2 v 1 4 F eb 1 99 9 SOURCES OF RELATIVISTIC JETS IN THE GALAXY

ar X iv : h ep - p h / 07 02 02 6 v 1 2 F eb 2 00 7 The τ lepton anomalous magnetic moment

We review the Standard Model prediction of the τ lepton g−2 presenting updated QED and electroweak contributions, as well as recent determinations of the leading-order hadronic term, based on the low energy e + e − data, and of the hadronic light-by-light one.

ar X iv : h ep - t h / 06 06 00 8 v 1 1 Ju n 20 06 Feynman problem in the noncommutative case

In the context of the Feynman’s derivation of electrodynamics, we show that noncommutativity allows other particle dynamics than the standard formalism of electrodynamics.