Back pages of No. 45, 1987

Map of Galápagos. Medium Ground Finch (Geospiza fortis), Drawing by Godfrey Merlen.

Back pages of No. 43, 1986

Back cover. Map of Galápagos. Galapagos Penguin, Photo by G.T. Corley Smith.

Back pages of No. 46, 1988

Back cover. Members of Charles Darwin Foundation. Map of Galapagos.

The vacuum Regge Trajectory in conventional field theory

The effect on the scattering amplitude of the existence of a pole in the angular momentum plane near J = 1 in the channel with the quantum numbers of the vacuum is calculated. This is then compared with a fourth order calculation of the scattering of neutral vector mesons from a fermion pair field in the limit of large momentum transfer. The presence of the third double spectral function in the perturbation amplitude complicates the identification of pole trajectory parameters, and the limitations of previous methods of treating this are discussed. A gauge invariant scheme for extracting the contribution of the vacuum trajectory is presented which gives agreement with unitarity predictions, but further calculations must be done to determine the position and slope of the trajectory at s = 0. The residual portion of the amplitude is compared with the Gribov singularity.

Back pages of No. 47, 1989

Back cover

Back page of No. 44, 1986

Membership of CDF Council

Back pages of No. 50, 1991

Back cover. We Need Your Help! Map.

Back pages of No. 51, 1992

Charles Darwin Foundation. Map.

Back pages of No. 52, 1993

Back cover. Charles Darwin Foundation for the Galapagos Islands. Map.

Back page of No. 42, 1985

Charles Darwin Foundation for the Galapagos Islands.