Recent QCD Studies at the Tevatron

Since the beginning of Run II at the Fermilab Tevatron, the QCD physics groups of the CDF and D0 experiments have worked to reach unprecedented levels of precision for many QCD observables. Thanks to the large dataset - over 3 fb^-1 of integrated luminosity recorded by each experiment - many important new measurements have recently been made public and will be summarized in this paper.Comment: Contributed to XXII Rencontres de Physique de la Vallee d'Aoste in La Thuile, Italy on behalf of the CDF and D0 collaboration

Observation of the s-channel and other studies of single top quarks at the Tevatron

First observation of single-top-quark production in the s channel is reported. The result is based on the combination of the CDF and D0 measurements of the cross section in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. A summary of other recent single-top-quark results are also included.Comment: Submitted to proceedings of Les Rencontres de Physique de la Vall\'ee d'Aoste. (v2 corrects several typos

Higgs Boson Searches at CDF

Results are presented on searches for standard model and non-standard model production of a Higgs boson in pbar-p collisions at sqrt{s}= 1.96 TeV with the CDF II detector at the Fermilab Tevatron. Using data corresponding to 2-3.6 1/fb of integrated luminosity, searches are performed in a number of different production and decay modes. No excess in data above that expected from backgrounds is observed; therefore, we set upper limits on the production cross section times branching fraction as a function of the Higgs boson mass.Comment: Lake Louise Winter Institute 2009 16th-21st February 2009 Alberta, Canada (4 pages and 4 figures) v2 includes updated reference

Craig Coch Field Surveys Group meeting, Malvern February 1976: UWIST Paper 7. River Wye vegetation survey

The problem as stated in the contract for this survey is that “the River Wye is regarded as a Grade 1 site in the Nature Conservation Review. The enlargement of an existing reservoir at Craig Goch in Powys intended eventually to regulate the river flow within the Wye and Severn could have an undesirable and adverse effect upon the ecology and Nature Conservation interest of the River Wye.” The object of this survey, again as stated in the Nature Conservancy Council contract, is “to determine the distribution of aquatic and marginal plants within the River, Wye, which is defined loosely as the river plus its retaining banks. To study aspects of the ecology of riparian habitats by relating distribution to recorded variables, and suggest possible means of management.” It is proposed that the vegetation survey is to take 60% of the available time and the experimental side 40%. Mr. D.G. Merry has been appointed as a research assistant for three years to work on the project under the supervision of Dr. F.M. Slater

Craig Coch Field Surveys Group meeting, Malvern 3-4 February 1976: UWIST Paper 3. Comparison of two methods of collecting macro-invertebrates from the R. Wye

The adequacy of different methods of sampling invertebrates for the collection of qualitative and quantitative information for surveillance purposes has been the centre of discussion at Craig Goch Surveys Group meetings (Abel, 1975). This paper compares two methods of collecting macro-invertebrates from the R. Wye

Craig Coch Field Surveys Group meeting, Malvern February 1976: UWIST Paper 4. Invertebrates: River Wye

Except for a single summer survey by Morgan (1970) no significant investigations of the invertebrate fauna of the R. Wye have been undertaken as far as we are aware. The current programme was designed to describe the distribution and relative abundance of aquatic invertebrates, in the R. Wye and those tributaries relevant to the proposals to regulate discharge in the river system. In addition, a more intensive localised study has been established to describe the population dynamics of selected invertebrate communities more precisely and to establish the feasibility of assessing the effect of secondary production of regulating discharges. Complementary studies on the drift of invertebrates have been undertaken. These data will be needed as a basis for evaluating the effects of the proposed Craig Goch scheme on the invertebrate fauna in the Wye catchment

Craig Coch Field Surveys Group meeting, Malvern February 1976: UWIST Paper 5. Invertebrate studies: Ystwyth & Rheidol

The Rivers Ystwyth and Rheidol have a history of metal pollution (Carpenter 1924, 1925: Newton 1944): many reaches still receive substantial volumes of water contaminated with heavy metals, principally zinc and lead, although there has been considerable improvement in water quality and biological status in recent years, particularly in the R. Rheidol (Jones & Howells 1969). As a consequence of proposals to divert uncontaminated water from the headstreams of both rivers in order to provide a refill source for the enlarged Craig Goch Reservoir, a surveillance programme was instituted to provide base-line data for water quality, fisheries and invertebrates. U.W.I.S.T., under contract to W.N.W.D.A., has implemented a programme which will provide information on the variety, distribution and relative abundance of aquatic invertebrates: the study of other aspects has been undertaken by South West Wales River Division (1976)