Jim Brau is an expert in particle physics and gravitational wave astrophysics. He teaches physics and astronomy. He is the Philip H. Knight Professor of Natural Science and the past director of the Center for High Energy Physics. His research is supported by the Office of Science of the U.S. Department of Energy and the National Science Foundation. Jim is a member of the ATLAS Collaboration, studying high energy physics at the Large Hadron Collider and the LIGO Scientific Collaboration, where he is involved in the search for gravitational waves. He is associate director of the Linear Collider Collaboration, a world-wide effort to realize the next large particle physics project. He can talk about the fundamentals of physics and astronomy, federal funding for science research and the societal benefits of investment in basic research.
Areas of Expertise (6)
Media Appearances (1)
Brau to help lead international effort on next-generation collider
Around the O
University of Oregon particle physicist Jim Brau has been named associate director for physics and detectors for the Linear Collider Collaboration, an international organization uniting particle physicists, accelerator physicists, engineers and other scientists preparing for the next generation of particle colliders.
We present the results from an all-sky search for short-duration gravitational waves in the data of the first run of the Advanced LIGO detectors between September 2015 and January 2016. The search algorithms use minimal assumptions on the signal morphology, so they are sensitive to a wide range of sources emitting gravitational waves. The analyses target transient signals with duration ranging from milliseconds to seconds over the frequency band of 32 to 4096 Hz. The first observed gravitational-wave event, GW150914, has been detected with high confidence in this search; other known gravitational-wave events fall below the search's sensitivity. Besides GW150914, all of the search results are consistent with the expected rate of accidental noise coincidences. Finally, we estimate rate-density limits for a broad range of non-BBH transient gravitational-wave sources as a function of their gravitational radiation emission energy and their characteristic frequency. These rate-density upper-limits are stricter than those previously published by an order-of-magnitude.
The production cross-section of J/ψ pairs is measured using a data sample of pp collisions collected by the LHCb experiment at a centre-of-mass energy of √ s = 13 TeV, corresponding to an integrated luminosity of 279 ± 11 pb−1. The measurement is performed for J/ψ mesons with a transverse momentum of less than 10 GeV/c in the rapidity range 2.0 < y < 4.5. The production cross-section is measured to be 13.5 ± 0.9 ± 0.8 nb. The first uncertainty is statistical, and the second is systematic. The differential cross-sections as functions of several kinematic variables of the J/ψ pair are measured and compared to theoretical predictions
Same- and opposite-sign charge asymmetries are measured in lepton+jets tt¯ events in which a b-hadron decays semileptonically to a soft muon, using data corresponding to an integrated luminosity of 20.3 fb−1 from proton-proton collisions at a centre-of-mass energy of √s=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. The charge asymmetries are based on the charge of the lepton from the top-quark decay and the charge of the soft muon from the semileptonic decay of a b-hadron and are measured in a fiducial region corresponding to the experimental acceptance. Four CP asymmetries (one mixing and three direct) are measured and are found to be compatible with zero and consistent with the Standard Model.
University of Oregon professor James Brau, Ph.D., guides you through the universe of particle physics. Find out about the Large Hadron Collider and the world’s biggest scientific experiment. Understand “dark matter” and “dark energy.” Consider what today’s collider experiments may reveal in the future about the structure, behavior, and history of the universe.
We present a brief summary of the International Linear Collider as documented in the 2013 Technical Design Report. The Technical Design Report has detailed descriptions of the accelerator baseline design for a 500 GeV e+e- linear collider, the R&D program that has demonstrated its feasibility, the physics goals and expected sensitivities, and the description of the ILD and SiD detectors and their capabilities.