Neutrino
Oscillation
Results from the MiniBooNE Experiment
This talk reports the initial results from a search for muon neutrino to electron neutrino oscillations from the MiniBooNE Experiment at Fermilab. The MiniBooNE experiment was motivated by the results from the LSND experiment which indicated evidence for neutrino oscillations at a mass scale of approximately 1 eV^2. Given evidence for neutrino oscillations from other experiments at different mass scales, these results, if verified, would necessitate drastic changes to the standard model of particle physics. MiniBooNE searched for the appearance of electron neutrinos in a high-intensity muon neutrino beam at Fermilab. An introduction to the field of neutrino physics will be presented followed by a description of the MiniBooNE experiment. Results from the oscillation search will be described and the implications discussed.
| Date | Speaker (link to SPIRES) |
Title (abstract) |
| 15th Feb 2007 (Thu) |
Paulo F. Bedaque (U. of Maryland at College Park) |
Nuclear Forces from Lattice QCD (.pdf-file) We will consider the possibility of a first principles calculation of nuclear forces from QCD and discuss the practical and conceptual issues arising. The first (and most recent) numerical results will shown. See also hep-lat/0602010 (nucleon-nucleon), hep-lat/0612026 (hyperon-nucleon), hep-lat/0506013 (pion-pion, I=2). |
| 19th Apr 2007 (Thu) | Gautam
Rupak (North Carolina State U., Chapel Hill) * |
Hot Dilute Neutron Matter (.pdf-file) The equation of state for hot dilute neutron matter is model-independently calculated to the third order in a virial expansion, at densities and temperatures that are relevant for neutrino-neutron interactions in proto-neutron stars. A general formalism for neutron matter with spin polarization is derived using a low-energy effective field theory. The long-wavelength neutrino response is calculated from the virial expansion, and can serve as a benchmark for model calculations that are in current use. The results are also of interest in atomic systems near the Feshbach resonance where universal behavior is expected. |
| 26th
Apr 2007 (Thu) |
Thomas D. Cohen (U. of Maryland at College Park) |
Heavy Baryons
in the Skyrme
Model, Revisited (blackboard-talk) The standard treatment of heavy baryons (i.e. baryons with one heavy quark) in Skyrme type models was developed in the early to mid 1990s. The basic picture which emerges is that heavy baryons are envisioned as bound states of heavy mesons with ordinary baryons. The standard treatment implicitly works in the limit where the number of colors QCD, Nc, is taken to be large and where the mass of the heavy quark is large; it can be taken as the leading term in an expansion around that limit. Many properties exhibited by the Skyrme with this treatment can be shown to be exact results of QCD in this combined limit---a new symmetry of QCD emerges in the combined limit. Analogous arguments can be made for heavy pentaquarks which can be shown to necassrily exist and be stable in this combined limit. The key question addressed here is whether Nc and the quark mass are large enough to justify this treatment. It will be shown that when one uses reasonable parameters fit to real world observables, the system appears to be well outside the domain of validity of the standard treatment. Remarkably, one relation coming from this treatment, which fixes properties of the Isgur-Wise form factor to the excitation energy of the heavy baryon, appears to be quite robust---holding to good approximation despite the system appearing to be being out of the regime of validity of the expansion. See also hep-ph/0702189. |
| 3rd May 2007 (Thu) |
Steve Karataglidis (Rhodes U., South Africa) |
MCAS:
A Multi-Channel Algebraic Scattering Theory for Low-Energy Scattering (.pdf-file) A new model is presented for low-energy nucleon-nucleus scattering in which the resonances in the compound nucleus are described by a collective model, coupling the nucleon to states in the target. The coupled (complex) Lipmann-Schwinger equations are solved in momentum space, allowing also for the description of sub-threshold states. Central to the success of the coupled-channel calculations is the inclusion of the Pauli principle, leading to a highly non-local low-energy optical potential. Violation of the Pauli principle can be quite severe and will be discussed. Examples will be presented for the scattering from both stable and exotic nuclei. |
| 10th May 2007 (Thu) |
Rex Tayloe (Indiana U.) |
Neutrino
Oscillation
Results from the MiniBooNE Experiment This talk reports the initial results from a search for muon neutrino to electron neutrino oscillations from the MiniBooNE Experiment at Fermilab. The MiniBooNE experiment was motivated by the results from the LSND experiment which indicated evidence for neutrino oscillations at a mass scale of approximately 1 eV^2. Given evidence for neutrino oscillations from other experiments at different mass scales, these results, if verified, would necessitate drastic changes to the standard model of particle physics. MiniBooNE searched for the appearance of electron neutrinos in a high-intensity muon neutrino beam at Fermilab. An introduction to the field of neutrino physics will be presented followed by a description of the MiniBooNE experiment. Results from the oscillation search will be described and the implications discussed. |
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Harald W. Griesshammer,
Spring 2007