HERA Diffractive Structure Function Data and Parton Distributions

Recent diffractive structure function measurements by the H1 and ZEUS experiments at HERA are reviewed. Various data sets, obtained using systematically different selection and reconstruction methods, are compared. NLO DGLAP QCD fits are performed to the most precise H1 and ZEUS data and diffractive parton densities are obtained in each case. Differences between the Q^2 dependences of the H1 and ZEUS data are reflected as differences between the diffractive gluon densities.Comment: Contributed to the Proceedings of the Workshop on HERA and the LHC, DESY and CERN, 2004-200

Federal Agency Investigations: Procedural Rights of the Subpoenaed Witness

This article is designed to help fill a gap in the literature and to warn government attorneys, particularly, about some questionable asides in the Hannah case. We shall not deal with record-keeping requirements or with agency inspections, subpoenas duces tecum, and related search and seizure problems. The focus instead is on the subpoenaed witness; that is, a man who knows that force may be used against him unless pursuant to government command he appears and answers questions. We examine several rights that may protect the witness; and we shall also ask whether the agencies, to discharge their governmental duties, truly need the subpoena power