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NOvA
Mu2e
HyperCP


Our group's current research concerns experimental investigations into symmetries of nature, in particular, elucidating the source of the slight asymmetry between matter and antimatter, or CP violation. This tiny asymmetry is thought to be responsible for the nearly absolute asymmetry between matter and antimatter in the universe, indeed why there is any matter at all in the universe. Although such matter-antimatter asymmetries have been observed in the decay of neutral kaons and beauty mesons, they are too small to explain the cosmological asymmetry: new sources are needed. One goal of our research is to search for these new sources, which will undoubtedly come from physics beyond the standard model. To quote Bigi and Sanda from their book, CP Violation:
"We are willing to stake our reputation on the prediction that dedicated and comprehensive studies of CP violation will reveal the presence of New Physics."

A new idea to explain the matter-antimatter asymmetry in the universe is called leptogenesis. Rather than the asymmetry being caused directly by the behavior of particles composed of quarks, baryons such as the proton and neutron, it is caused by an asymmetry between leptons and antileptons. The lepton asymmetry is then converted into a baryon asymmetry. Models explaining neutrino masses and leptogenesis can produce lepton flavor violation, for example, the conversion of a muon into an electron. These ideas have led our group to experiments investigation matter-antimatter asymmetries in neutrinos, as well as the search for lepton flavor violation.

The experiments that we are currently working on, D-zero, Mu2e, and NOvA, are all either directly searching for matter-antimatter asymmetries, or are searching for related phenomena. D-zero is a general purpose experiment designed to search for a variety of phenomena at the highest energy scales. Our interest in D-zero is the search for lepton flavor violation. NOvA will perform a variety of neutrino measurements, including what could be the first search for matter-antimatter asymmetries in neutrinos. Finally, Mu2e, which will search for lepton flavor violation with unprecented sensitivities, will be one of the flagship experiments of the future Fermilab high-intensity physics program.

What's New?


NOvA Experiment
NOvA is a second generation, accelerator based, long-baseline neutrino oscillation experiment, and the flag ship experiment for Fermilab's Intensity Frontier program. NOvA is specifically designed to resolve the outstanding questions in neutrino mixing and the structure of the neutrino sector, and features a unique "totally active" range stack design that singles it out as one of the most sensitivity and versatile neutrinos experiments in the world.

Over the last decade, since the discovery of finite, non-zero neutrino mass through their oscillations over the solar and atmospheric distance and energy scales— the first evidence of physics beyond the standard model — much has been learned about elusive world of neutrinos. Yet much remains to be learned. NOvA is poised to make seminal measurements of neutrino properties that will answer questions of whether neutrinos are a source for the Matter/Anti-matter asymmetry of the universe. NOvA will lead the US domestic particle physics program and poise Fermilab as the premier laboratory for neutrino investigation and precision physics.

The NOvA experiments consists of two independent detectors separated by 810km. The far detector is sited in northern Minnesota near the US/Canadian border, at Ash River, and sited 14mrad away from the primary beam axis, in what is referred to as the "off-axis" configuration. This choice of site location and baseline is what allows NOvA to perform precisions measurements of &theta13 and &theta23. The far detector, at a massive 15,000 tons, will be the largest liquid scintillator calorimeter/range stack ever build.

Construction of the NOvA experiment started in May of 2009 and will continue for about four years.

Virginia's role on NOvA
The Virginia group is responsible for all aspects of two critical components of the NOvA detectors and C.Dukes and A.Norman serve as the Level-3 managers for these projects. Craig Dukes leads Readout Infrastructure and the Power Distribution System (PDS) that provides all of the mechanical support, cooling and power to the 357,000 channels of electronics. Andrew Norman is in charge of the Data Acquisition (DAQ) Integration task, as wells as the Detector Controls and Monitoring tasks which together provide the hardware/software interfaces for the NOvA experiment. Both Dukes and Norman have been long time members of the NOvA collaboration and have been insturmental in the design and evolution of many of the critical detector subsystem.

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A few NOvA Talks
Accessing Particle/Astrophysics Measurements with the NOvA Detector .pptx .pdf
Norman, Seminar Argonne National Lab, Aug. 2009
NOvA: The NuMI Offaxis &nue Appearance Experiment .ppt .pdf
Norman, DPF2009, July 2009
Power Distribution and Readout Infrastructure .ppt .pdf
Dukes, Dept. of Energy CD-3 Review, July 2009
NOvA Detector Controls and DAQ Integration .pptx .pdf
Norman, Dept. of Energy CD-3 Review, July 2009
DCM Embedded Software Systems .pptx
Norman, NOvA Collaboration Meeting, July 2009
Accelerator Based Neutrino Physics at Fermilab: .ppt
Dukes, SESAPS Meeting, October 2008
NOvA: the NuMI Offaxis νe Appearance Experiment: .ppt .pptx
Norman, Nufact07, August 2007

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Mu2e Experiment
The goal of Mu2e is to search for charged lepton flavor violation through the coherent conversion of a muon to an election in the field of the nucleus, μNeN, with a single event sensitivity of 2 x 10^-17, four orders of magnitude beyond the present limit set by the Sindrum II collaboration At the proposed level of sensitivity, the Mu2e experiment would be extremely sensitivity to many new theories of physics beyond the standard model, including models of supersymmetry and models which explain the unusual structure of the neutrino mass hierarchy.

The Mu2e experiment is part of the broad new initiative in particle physics to establish cutting edge physics program at the intensity frontier which will give us new understanding into physics beyond the standard model, and will firmly place Fermilab as the leader in the next generation of high intensity and precision measurements.

Mu2e was received Stage-1 approval by Fermilab in November, 2008 and CD-0 approval in August of 2009. The Mu2e collaboration is currently working on detailed designs of the beamline and magnet systems, and on critical simulation and designs of the detector components to extend the scope and reach of the experiment.

Virginia's role on Mu2e
The Virginia group is involved in the electromagnetic calorimeter and the cosmic ray veto shield. Craig Dukes serves as head of the Institutional Board and was editor of the experimental proposal. Andrew Norman serves on the background task-force, and is involved the in the software and simulation efforts.

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A few Mu2e Talks
The Mu2e Experiment at FNAL .pptx .pdf
Norman, DPF2009 Wanye State University, July 2009
The Mu2e and g-2 Experiments: Precision Windows into Physics Beyond the Standard Model .pptx .pdf
Norman, FNAL Users Meeting, June 2009
Beyond E=mc^2: Rare Particle Decays .ppt
Dukes, Colloquium talk, 2009
A High-Sensitivity Search for Charged Lepton Flavor Violation at Fermilab .ppt
Dukes, Nufact 08, July 2008
A High-Sensitivity Search for Charged Lepton Flavor Violation at Fermilab .ppt
Dukes, University of Minnesota, May 2008

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DØ Experiment

The DØ experiment has been a world leader in collider physics. DØ operates at the energy frontier, colliding a proton beam with an anti-proton beam at a center of mass energy of 1.96 TeV (trillion electron volts) at Fermilab's Tevatron accelerator. DØ will continue to run and collect data through at least the end of 2011. The almost six fb^{-1} of data already recorded has allowed researchers to investigate the most pressing topics in modern physics, including searches for the Higgs boson, searches for signs of Super Symmetry, observation of the top quark, discovery of new baryons with heavy quark content, and precision measurements from the decay of heavy B-mesons.

The University of Virginia High energy group in heavily involved in both the operations of the experiment and the analysis of the data sets currently collected. The research goals of the Virginia group are focused on two areas of investigation that tie in to our work on NOvA and Mu2E.

Within the B-meson systems (the class particles consisting of a quark and anti-quark pair, where one of the quarks is heavy "bottom" flavor quark) we are looking at the class of possible decays of the B_s (a bottom + strange quark state) where a dilepton state is possible. These types of decays and in particular B_s -> mu mu and B_s -> mu e allow us to probe with extreme precision for matter/anti-mater asymmetries in the CKM mixing matrix through the measurement of Flavor Changing Weak Neutral currents (FCNC) and also for Lepton Family Number Violation (LFV) at can arise naturally through contributions from super symmetry to the B_s -> mu e decay mode. In addition we are investigating a series of other related decay modes bottom-strange meson which isolate specific type of FCNC and LFV currents. The program of investigation is handled through our Rare B Physics working group, and has openings for Virginia graduate student to pursue their doctoral research.

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DØ Working Groups
Rare B Decays and B Physics Alternate Tuesdays 4pm Central (Norman/Dukes)
Higgs->WW Analysis Mondays 2pm Central (Hirosky/Bueller/Zellich)

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HyperCP Experiment
The HyperCP experiment was initiated by Craig Dukes and Kam-Biu Luk (Berkeley). Dukes has served as co-spokesperson since its inception. It was designed to search for rare phenomena in the decay of hyperonds, in particular, matter-antimatter asymmetries, or CP violation, in Λ and Ξ decays. To do so we designed and built one the highest rate spectrometers ever made, and, in 1997 and 1999 accumulated the largest data sample ever taken: 231 billion events, or twenty times all the data on all the World Wide Web pages in the world at the time.

The CP violation analysis showed no evidence of any matter-antimatter asymmetry at the 10^-4 level, a two order of magnitude improvement in sensitivity. This implies that there are probably no exotic sources of CP violation in hyperon decays. Among other results we have observed the rarest baryon decay ever, Σ → pμ μ, and find hints that it may proceed via a hitherto unknown intermediate state that some have suggested could be the sgoldstino, a supersymmetric particle, or perhaps the Higgs.

Virginia's role on HyperCP The Virginia group played a seminal role in the fabrication of the spectrometer, designing and building: the upstream wire chambers, the hadronic calorimeter, the proton hodoscope, the triggers, and all 20,000 channels of preamplifiers. All of the CP violation analyzes were done by Virginia, and indeed all of the precision measurements.

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A few HyperCP Talks
The Search for New Physics in Hyperon Decays .ppt
Dukes, Carnegie-Mellon Seminar, March 2007
Search for CP Violation in Ξ and Λ Hyperon Decays with the HyperCP spectrometer at Fermilab .pdf
Materniak, BEACH 2008 talk, June 2008
What's the Matter with Antimatter? .ppt
Dukes, Society of Physics Students talk, December 2006
The Search for CP Violation in Hyperon Decays .ppt
Dukes, BEACH06 talk, July. 2006

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Last update of this page: 4 March 2009