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'MiniBooNE' is an experiment at Fermilab designed to observe neutrino oscillations (BooNE is an acronym for the Booster Neutrino Experiment). A neutrino beam consisting primarily of muon neutrinos is directed at a detector filled with 800 tons of mineral oil and lined with 1,280 photomultiplier tubes. An excess of electron neutrino events in the detector would support the neutrino oscillation interpretation of the LSND result.
Experimental observation of solar neutrinos and atmospheric neutrinos provided evidence for neutrino oscillations, implying that neutrinos have masses. Data from the LSND experiment at Los Alamos National Laboratory are controversial since they are not compatible with the oscillation parameters measured by other neutrino experiments in the framework of the Standard Model. Either there must be an extension to the Standard Model, or one of the experimental results must have a different explanation. Moreover, the KARMEN experiment in England examined a region similar to the LSND experiment, but saw no indications of neutrino oscillations. This experiment was less sensitive than LSND, and both could be right.
Cosmological data can provide an indirect but rather model-dependent bound to the mass of sterile neutrinos, such as the ms < 0.26eV (0.44eV) at 95% (99.9%) confidence limit given by Dodelson, Melchiorri, and Slosar.[1]
However, cosmological data can be accommodated within models with different assumptions, such as that by Gelmini et al.[2]
MiniBooNE was designed to unambiguously verify or refute the LSND controversial result in a controlled environment.
MiniBooNE reached their first results in late March 2007 and reported no evidence for muon neutrino to electron neutrino oscillations in the LSND region, refuting a simple 2-neutrino oscillation interpretation of the LSND results.[3]
More advanced analyses of their data are currently being undertaken by the MiniBooNE collaboration; early indications are pointing towards the existence of the sterile neutrino,[4]
and startling confirmation of the existence of the bulk.[5]
Bill Louis, of the MiniBooNE project, has emailed the brane theorists saying: "It is indeed startling to see how well your model appears to fit our excess of low energy events!" There remains the possibly that the effect is a spurious statistical or background anomaly and further analysis is underway.
1. Is cosmology compatible with sterile neutrinos?, Scott Dodelson, Alessandro Melchiorri, and Anze Slosar, , , Phys Rev Lett.,
2. Low reheating temperature and the visible sterile neutrino, G. Gelmini, S. Palomares-Ruiz, and S. Pascoli, , , Phys Rev Lett.,
3. A Search for Electron Neutrino Appearance at the Δ m2 ~ 1 eV2 Scale, The MiniBooNE Collaboration, , , Phys Rev Lett.,
4. Dimensional Shortcuts, Mark Alpert, , , Scientific American,
5. Shortcuts in extra dimensions and neutrino physics, Heinrich Päs, Sandip Pakvasa, Thomas J. Weiler, , , ,
★ MiniBooNe first results press release and arXiv paper
★ MiniBooNE website
★ Overview of MiniBooNE for Mineral Oil Suppliers
★ An informal discussion of the experiment and initial results
★ Experiment Nixes Fourth Neutrino (April 2007 Scientific American)
★ Dimensional Shortcuts - evidence for sterile neutrino; (August 2007; Scientific American)
| Contents |
| History and motivation |
| References |
| External links |
History and motivation
Experimental observation of solar neutrinos and atmospheric neutrinos provided evidence for neutrino oscillations, implying that neutrinos have masses. Data from the LSND experiment at Los Alamos National Laboratory are controversial since they are not compatible with the oscillation parameters measured by other neutrino experiments in the framework of the Standard Model. Either there must be an extension to the Standard Model, or one of the experimental results must have a different explanation. Moreover, the KARMEN experiment in England examined a region similar to the LSND experiment, but saw no indications of neutrino oscillations. This experiment was less sensitive than LSND, and both could be right.
Cosmological data can provide an indirect but rather model-dependent bound to the mass of sterile neutrinos, such as the ms < 0.26eV (0.44eV) at 95% (99.9%) confidence limit given by Dodelson, Melchiorri, and Slosar.[1]
However, cosmological data can be accommodated within models with different assumptions, such as that by Gelmini et al.[2]
MiniBooNE was designed to unambiguously verify or refute the LSND controversial result in a controlled environment.
MiniBooNE reached their first results in late March 2007 and reported no evidence for muon neutrino to electron neutrino oscillations in the LSND region, refuting a simple 2-neutrino oscillation interpretation of the LSND results.[3]
More advanced analyses of their data are currently being undertaken by the MiniBooNE collaboration; early indications are pointing towards the existence of the sterile neutrino,[4]
and startling confirmation of the existence of the bulk.[5]
Bill Louis, of the MiniBooNE project, has emailed the brane theorists saying: "It is indeed startling to see how well your model appears to fit our excess of low energy events!" There remains the possibly that the effect is a spurious statistical or background anomaly and further analysis is underway.
References
1. Is cosmology compatible with sterile neutrinos?, Scott Dodelson, Alessandro Melchiorri, and Anze Slosar, , , Phys Rev Lett.,
2. Low reheating temperature and the visible sterile neutrino, G. Gelmini, S. Palomares-Ruiz, and S. Pascoli, , , Phys Rev Lett.,
3. A Search for Electron Neutrino Appearance at the Δ m2 ~ 1 eV2 Scale, The MiniBooNE Collaboration, , , Phys Rev Lett.,
4. Dimensional Shortcuts, Mark Alpert, , , Scientific American,
5. Shortcuts in extra dimensions and neutrino physics, Heinrich Päs, Sandip Pakvasa, Thomas J. Weiler, , , ,
External links
★ MiniBooNe first results press release and arXiv paper
★ MiniBooNE website
★ Overview of MiniBooNE for Mineral Oil Suppliers
★ An informal discussion of the experiment and initial results
★ Experiment Nixes Fourth Neutrino (April 2007 Scientific American)
★ Dimensional Shortcuts - evidence for sterile neutrino; (August 2007; Scientific American)
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