B. Abbott

Performance of an operating high energy physics data grid: DØSAR-Grid

The DO experiment at Fermilabs Tevatron will record several petabytes of data over the next five years in pursuing the goals of understanding nature and searching for the origin of mass. Computing resources required to analyze these data far exceed capabilities of any one institution. Moreover, the widely scattered geographical distribution of DO collaborators poses further serious difficulties for optimal use of human and computing resources. These difficulties will exacerbate in future high energy physics experiments, like the LHC. The computing grid has long been recognized as a solution to these problems. This technology is being made a more immediate reality to end users in DO by developing a grid in the DO Southern Analysis Region (DOSAR), DOSAR-Grid, using all available resources within it and a home-grown local task manager, McFarm. We will present the architecture in which the DOSAR-Grid is implemented, the use of technology and the functionality of the grid, and the experience from operating the grid in simulation, reprocessing and data analyses for a currently running HEP experiment.

Search for the Higgs Boson in the H{yields}WW{yields}l{nu}jj Decay Channel in pp Collisions at {radical}(s)=7 TeV with the ATLAS Detector

A search for a Higgs boson has been performed in the H→WW→ℓνjj channel in 1.04 fb(-1) of pp collision data at √s=7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No significant excess of events is observed over the expected background and limits on the Higgs boson production cross section are derived for a Higgs boson mass in the range 240 GeV<m(H)<600 GeV. The best sensitivity is reached for m(H)=400 GeV, where the 95% confidence level upper bound on the cross section for H→WW production is 3.1 pb, or 2.7 times the standard model prediction.

Measurement of the ratio of inclusive cross sections {sigma}(pp{yields}Z+b-quark jet)/{sigma}(pp{yields}Z+jet) at {radical}(s)=1.96 TeV

The ratio of the cross section for pp interactions producing a Z boson and at least one b-quark jet to the inclusive Z+jet cross section is measured using 4.2 fb{sup -1} of pp collisions collected with the D0 detector at the Fermilab Tevatron collider at {radical}(s)=1.96 TeV. The Z{yields}l{sup +}l{sup -} candidate events with at least one b jet are discriminated from Z+charm and light jet(s) events by a novel technique that exploits the properties of the tracks associated to the jet. The measured ratio is 0.0193{+-}0.0027 for events having a jet with transverse momentum p{sub T}>20 GeV and pseudorapidity |{eta}|{<=}2.5, which is the most precise to date and is consistent with theoretical predictions.The ratio of the cross section for

Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at {radical}(s{sub NN})=2.76 TeV with the ATLAS Detector at the LHC

p\bar{p}

Measurement of tt production in the {tau}+jets topology using pp collisions at {radical}(s)=1.96 TeV

interactions producing a

Double parton interactions in {gamma}+3 jet events in pp collisions at {radical}(s)=1.96 TeV

Z

Search for CP violation in B{sub s}{sup 0{yields}{mu}+}D{sub s}{sup -}X decays in pp collisions at {radical}(s)=1.96 TeV

boson and at least one

Evidence for the Decay B{sub s}{sup 0}{yields}D{sub s}{sup (*)}D{sub s}{sup (*)} and a Measurement of {delta}{gamma}{sub s}{sup CP}/{gamma}{sub s}

b

Measurement of the Angular and Lifetime Parameters of the Decays B{sub d}{sup 0}{yields}J/{psi}K*{sup 0} and B{sub s}{sup 0}{yields}J/{psi}{phi}

quark jet to the inclusive

Search for Pair Production of Doubly Charged Higgs Bosons in the H{sup ++}H{sup --}{yields}{mu}{sup +}{mu}{sup +}{mu}{sup -}{mu}{sup -} Final State

Z+{\rm jet}