We present a search for a narrow resonance in the inclusive diphoton final state using ∼ 2.7 fb −1 of data collected with the D0 detector at the Fermilab Tevatron pp Collider. We observe good agreement between the data and the background prediction, and set the first 95% C.L. upper limits on the production cross section times the branching ratio for decay into a pair of photons for resonance masses between 100 and 150 GeV. This search is also interpreted in the context of several models of electroweak symmetry breaking with a Higgs boson decaying into two photons.

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This study aims to identify process‐response relationships between pedogeomorphological processes and the spatial distribution of soil properties on a hillslope. Thirty‐two physical and chemical attributes of 502 soil samples collected from 64 soil profiles on a hillslope in Somerset, UK, were analyzed using an ordination technique. Five factors explaining 80% of the total variation were first identified. Each factor was then regressed with terrain attributes to examine the influence of hillslope geomorphometry on soil distributions. Two‐way ANOVA was used to separate the total variance of individual soil properties into vertical and lateral components, and the results were compared with the results of the ordination. The five factors were interpreted as demonstrating the effects of podzolization, nutrient dynamics, Mn leaching, erosion weathering, and soil acidification. The ability to predict soil properties over the landscape using terrain information varies widely among soil properties measured. In general, topsoil properties are better correlated with terrain attributes than subsoil properties. Contemporary pedological and geomorphological processes are most active in the surface horizon, which results in clear lateral differentiation of soil properties. For subsurface soils, only those few soil properties that showed a clear spatial pattern could be successfully modeled using terrain attributes. This research demonstrates that clear differences in the spatial distribution of individual soil properties are mainly determined by differential involvement in in situ pedogenesis and lateral slope processes. Future soil‐landscape modeling attempts should pay more attention to the selection of soil properties and the interpretation of statistical results in relation to process‐response dynamics.

We report on a search for the pair production of second generation scalar leptoquarks (LQ) in ppbar collisions at the center of mass energy sqrt(s)=1.96 TeV using a data set corresponding to an integrated luminosity of 1.0 fb-1 collected with the D0 experiment at the Fermilab Tevatron Collider. Topologies arising from the LQLQbar->muqnuq and LQLQbar->muqmuq decay modes are investigated. No excess of data over the standard model prediction is observed and upper limits on the leptoquark pair production cross section are derived at the 95% C.L. as a function of the leptoquark mass and the branching fraction beta for the decay LQ->muq. These are interpreted as lower limits on the leptoquark mass as a function of beta. For beta=1 (0.5), scalar second generation leptoquarks with masses up to 316 GeV (270 GeV) are excluded.Comment: submitted to Phys. Lett.

We search for long-lived charged massive particles using 1.1 fb;{-1} of data collected by the D0 detector at the Fermilab Tevatron pp[over ] Collider. Time-of-flight information is used to search for pair produced long-lived tau sleptons, gauginolike charginos, and Higgsino-like charginos. We find no evidence of a signal and set 95% C.L. cross section upper limits for staus, which vary from 0.31 to 0.04 pb for stau masses between 60 and 300 GeV. We also set lower mass limits of 206 GeV (171 GeV) for pair produced charged gauginos (Higgsinos).