/ 05 04 04 4 v 1 2 6 A pr 2 00 5 First measurement of the π + π − atom lifetime

ar X iv : h ep - p h / 04 05 03 4 v 1 5 M ay 2 00 4 Spectra and decays of ππ and πK atoms

We describe the spectra and decays of π + π − and π ± K ∓ atoms within a non-relativistic effective field theory. The evaluations of the energy shifts and widths are performed at next-to-leading order in isospin symmetry breaking. We provide general formulae for all S-states, and discuss the states with angular momentum one in some detail. The prediction for the lifetime of the π ± K ∓ atom in ...

ar X iv : h ep - p h / 04 05 03 9 v 1 5 M ay 2 00 4 η , η ′ → π + π − γ with coupled channels

ar X iv : h ep - p h / 04 10 20 4 v 3 2 1 A pr 2 00 6 Heavy Quarkonium π + π − Transitions and a Possible bb̄qq̄ State

ar X iv : h ep - e x / 05 04 02 4 v 1 1 4 A pr 2 00 5 The A - dependence of K 0 and Λ neutrinoproduction on nuclei SKAT Collaboration

For the first time, the Adependence of the production of K, Λ and, for comparison, π mesons is investigated in neutrinonuclear reactions, using the data obtained with SKAT bubble chamber. An exponential parametrization (∼ Aβ) of the particle yields results in βV 0 = 0.20 ± 0.05 for V 0 particles (combined K and Λ), while for π mesons the Adependence is much weaker, βπ− = 0.068 ± 0.007. A nuclea...

ar X iv : m at h / 05 04 08 2 v 4 [ m at h . D G ] 1 5 A pr 2 00 6 COMPLETE PROJECTIVE CONNECTIONS

The first examples of complete projective connections are uncovered: on surfaces, normal projective connections whose geodesics are all closed and embedded are complete. On manifolds of any dimension, normal projective connections induced from complete affine connections with slowly decaying positive Ricci curvature are complete.