High-energy physics

Nanoscale freezing leads to better imagingFebruary 21, 2014

A new Bionanoprobe at the Advanced Photon Source dramatically improves three-dimensional nanoscale image mapping of trace elements within a cell.

Argonne helps NOvA experiment detect first neutrinosFebruary 19, 2014

Scientists last week on a major particle physics experiment detected neutrinos generated five hundred miles away, a major accomplishment in the study of neutrino physics that would not have been possible without Argonne’s contributions.

Precise Estimates of the Higgs Mass in Heavy SUSY
Abstract:
In supersymmetric models, very heavy stop squarks introduce large logarithms into the computation of the Higgs boson mass. Although it has long been known that in simple cases these logs can be resummed using effective field theory techniques, it is technically easier to use fixed-order formulas, and many public codes implement the latter. We calculate three- and four-loop NNLL corrections to the Higgs mass and compare the fixed order formulas numerically to the resummation results in order to estimate the range of SUSY scales where the fixed-order results are reliable.
Software for Scientific Computation: HEP and Beyond
Abstract:
An overview of scientific computing in HEP/ANL is given. I'll discuss the HEP/ANL analysis clusters, HEP/ANL software environment and the status of deployment of general-purpose HEP libraries on BlueGene/Q for CPU intensive calculations. In addition, a broad perspective on scientific computation is given, covering popular programming languages, scientific software developed in HEP/ANL and community-driven scientific software beyond HEP (the SCaVis project).

Forward-backward Asymmetry of the Top Quark-antiquark Pairs at the Tevatron: A Window for New Physics
Abstract:
The top-antitop charge asymmetry is a next-to-leading order effect predicted by Quantum Chromodynamics. It was measured both at the LHC and at the Tevatron. While measurements performed at the LHC by the ATLAS and CMS collaborations agree with the predictions made within the standard model, some tensions exist between predictions and the CDF and D0 measurements at the Tevatron. In this talk, we will present the latest measurements performed at the Tevatron and show the latest comparisons with the predictions.