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Search Results: 1 - 10 of 144430 matches for " F. DeJongh "
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Extracting $α$ from the CP Asymmetry in $B^0 \to π^+ π^-$ Decays
F. DeJongh,P. Sphicas
Physics , 1995, DOI: 10.1103/PhysRevD.53.4930
Abstract: The extraction of the CKM angle $\alpha$ from the asymmetry in $B^0 \to \pi^+\pi^-$ vs ${\bar B^0} \to \pi^+\pi^-$ suffers from a currently unknown penguin contribution. Experimentally, one can determine the magnitude and phase of the CP asymmetry from a time-dependent analysis of tagged events, and the average rate for $B^0$ and $\bar{B}^0$ decays to $\pi^+\pi^-$ from untagged events. These measurements, together with the magnitudes and relative phase of the tree and penguin diagrams, can in principle completely determine $\alpha$, free of discrete ambiguities. We perform an error analysis on $\alpha$ given assumptions on the values and uncertainties of both the measurements and theoretical inputs.
B+ and B0 Mean Lifetime Measurements
Fritz DeJongh
Physics , 1994,
Abstract: We review $B^+$ and $B^0$ mean lifetime measurements, including direct measurements and determination of the lifetime ratio via measurements of the ratio of branching ratios. We present world averages.
$B$ Physics with the CDF Run II Upgrade
Fritz DeJongh
Physics , 1995, DOI: 10.1016/0920-5632(96)00397-0
Abstract: We summarize Run I results relevant to an analysis of the CP asymmetry in $B\to J/\psi K_s$, the CDF upgrade plans for Run II, and some of the main $B$ physics goals related to the exploration of the origin of CP violation.
Long Baseline Neutrino Physics: From Fermilab to Kamioka
Fritz DeJongh
Physics , 2002,
Abstract: We have investigated the physics potential of very long baseline experiments designed to measure nu_mu to nu_e oscillation probabilities. The principles of our design are to tune the beam spectrum to the resonance energy for the matter effect, and to have the spectrum cut off rapidly above this energy. The matter effect amplifies the signal, and the cut-off suppresses backgrounds which feed-down from higher energy. The signal-to-noise ratio is potentially better than for any other conventional nu_mu beam experiment. We find that a beam from Fermilab aimed at the Super-K detector has excellent sensitivity to sin^2(2theta_13) and the sign of Delta M^2. If the mass hierarchy is inverted, the beam can be run in antineutrino mode with a similar signal-to-noise ratio, and event rate 55% as high as for the neutrino mode. Combining the Fermilab beam with the JHF-Kamioka proposal adds very complementary information. We find good sensitivity to maximal CP violation for values of sin^2(2theta_13) ranging from 0.001 to 0.05.
Laser Cooling of TeV Muons
Fritz DeJongh
Physics , 2000, DOI: 10.1016/S0168-9002(01)01313-4
Abstract: We show that Compton scattering can be used to cool TeV-scale muon beams, and we derive analytical expressions for the equilibrium transverse angular spread, longitudinal energy spread, and power requirements. We find that a factor of a few thousand reduction in emittance is possible for a 3 TeV muon collider.
Using the Fermilab Proton Source for a Muon to Electron Conversion Experiment
C. Ankenbrandt,D. Bogert,F. DeJongh,S. Geer,D. McGinnis,D. Neuffer,M. Popovic,E. Prebys
Physics , 2006,
Abstract: The Fermilab proton source is capable of providing 8 GeV protons for both the future long-baseline neutrino program (NuMI), and for a new program of low energy muon experiments. In particular, if the 8 GeV protons are rebunched and then slowly extracted into an external beamline, the resulting proton beam would be suitable for a muon-to-electron conversion experiment designed to improve on the existing sensitivity by three orders of magnitude. We describe a scheme for the required beam manipulations. The scheme uses the Accumulator for momentum stacking, and the Debuncher for bunching and slow extraction. This would permit simultaneous operation of the muon program with the future NuMI program, delivering 10^20 protons per year at 8 GeV for the muon program at the cost of a modest (~10%) reduction in the protons available to the neutrino program.
Time Dependent B0 B0-bar Mixing at CDF
Fritz DeJongh,George Michail
Physics , 1996,
Abstract: We describe two measurements of Delta m_d. The first uses B -> nu l D(*) events and a same-side flavor tagging algorithm. The second uses dilepton events. From the average of these two measurements we find Delta m_d = 0.466 +- 0.037 +- 0.031 ps^{-1}.
A New Method for Measuring Coherent Elastic Neutrino Nucleus Scattering at an Off-Axis High-Energy Neutrino Beam Target
S. J. Brice,R. L. Cooper,F. DeJongh,A. Empl,L. M. Garrison,A. Hime,E. Hungerford,T. Kobilarcik,B. Loer,C. Mariani,M. Mocko,G. Muhrer,R. Pattie,Z. Pavlovic,E. Ramberg,K. Scholberg,R. Tayloe,R. T. Thornton,J. Yoo,A. Young
Physics , 2013, DOI: 10.1103/PhysRevD.89.072004
Abstract: We present a new experimental method for measuring the process of Coherent Elastic Neutrino Nucleus Scattering (CENNS). This method uses a detector situated transverse to a high energy neutrino beam production target. This detector would be sensitive to the low energy neutrinos arising from pion decays-at-rest in the target. We discuss the physics motivation for making this measurement and outline the predicted backgrounds and sensitivities using this approach. We report a measurement of neutron backgrounds as found in an off-axis surface location of the Fermilab Booster Neutrino Beam (BNB) target. The results indicate that the Fermilab BNB target is a favorable location for a CENNS experiment.
Detector R&D for future Neutrino Experiments with the NuMI Beamline
G. Barenboim,A. Bodek,C. Bromberg,A. Bross,L. Buckley-Geer,B. Choudhary,D. Cline,F. DeJongh,G. Drake,S. Geer,M. Goodman,A. deGouvea,D. A. Harris,K. Heller,J. Huston,J. Johnstone,M. Kostin,J. Learned,P. Litchfield,M. Marshak,K. McDonald,K. S. McFarland,S. Menary,M. Messier,D. Michael,R. Miller,N. Mokhov,J. K. Nelson,E. Peterson,R. Richards,K. Ruddick,F. Sergiamepietri,P. Shanahan,R. Shrock,Y. Seo,R. Stefanski,M. Szleper,K. Tollefson,J. Urheim
Physics , 2003,
Abstract: A report to the Fermilab Director from the Study Group on Future Neutrino Experiments at Fermilab
Toward the automated generation of genome-scale metabolic networks in the SEED
Matthew DeJongh, Kevin Formsma, Paul Boillot, John Gould, Matthew Rycenga, Aaron Best
BMC Bioinformatics , 2007, DOI: 10.1186/1471-2105-8-139
Abstract: We have developed a method for generating genome-scale metabolic networks that produces substantially complete reaction networks, suitable for systems level analysis. Our method partitions the reaction space of central and intermediary metabolism into discrete, interconnected components that can be assembled and verified in isolation from each other, and then integrated and verified at the level of their interconnectivity. We have developed a database of components that are common across organisms, and have created tools for automatically assembling appropriate components for a particular organism based on the metabolic pathways encoded in the organism's genome. This focuses manual efforts on that portion of an organism's metabolism that is not yet represented in the database. We have demonstrated the efficacy of our method by reverse-engineering and automatically regenerating the reaction network from a published genome-scale metabolic model for Staphylococcus aureus. Additionally, we have verified that our method capitalizes on the database of common reaction network components created for S. aureus, by using these components to generate substantially complete reconstructions of the reaction networks from three other published metabolic models (Escherichia coli, Helicobacter pylori, and Lactococcus lactis). We have implemented our tools and database within the SEED, an open-source software environment for comparative genome annotation and analysis.Our method sets the stage for the automated generation of substantially complete metabolic networks for over 400 complete genome sequences currently in the SEED. With each genome that is processed using our tools, the database of common components grows to cover more of the diversity of metabolic pathways. This increases the likelihood that components of reaction networks for subsequently processed genomes can be retrieved from the database, rather than assembled and verified manually.The availability of hundreds of sequ
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