Nicaragua: a society in transition

Between December 1980 and March 1981, I spent three months in Nicaragua undertaking a documentary thesis project for a Master of Fine Arts degree in Photography. Initial preparation for the trip began in May 1980. My thesis exhibition was held October 11-16, 1981. The purpose of the thesis was to integrate creative expression with social/political concerns by photographing aspects of societal change that have grown out of the popular revolution in Nicaragua. This report is an accounting of that project from its inception to its completion. The project has been a rewarding experience, full of learning and growth. I have attempted herein to share many details of this experience in the hope that you, the reader, may be enriched by them as I have been

Measurement of the production of a W boson in association with a charm quark in pp collisions at √s = 7 TeV with the ATLAS detector

The production of a W boson in association with a single charm quark is studied using 4.6 fb−1 of pp collision data at s√ = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96+0.26−0.30 at Q 2 = 1.9 GeV2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio σ(W + +c¯¯)/σ(W − + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s−s¯¯¯ quark asymmetry