Neutrino Experiment to Test the Nature of Muon-Number Conservation

Willis, S.; Hughes, V. W.; Némethy, P.; Burman, R. L.; Cochran, D. R. F.; Frank, J. S.; Redwine, R.; Duclos, J.; Kaspar, H.; Hargrove, C. K.; Moser, U.

doi:10.1103/physrevlett.44.522

Cited by 117 publications

(38 citation statements)

References 10 publications

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“…The LANSCE beam dump has been used as the neutrino source for previous experiments [15,16,17]. A calibration experiment [18] measured the rate of stopped µ + from a low-intensity proton beam incident on an instrumented beam stop.…”

Section: The Neutrino Sourcementioning

confidence: 99%

Measurement of electron-neutrino electron elastic scattering

et al. 2001

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The cross section for the elastic scattering reaction νe + e − → νe + e − was measured by the Liquid Scintillator Neutrino Detector using a µ + decay-at-rest νe beam at the Los Alamos Neutron Science Center. The standard model of electroweak physics predicts a large destructive interference between the charge current and neutral current channels for this reaction. The measured cross section, σ νee − = [10.1 ± 1.1(stat.) ± 1.0(syst.)] × Eν e (MeV) ×10 −45 cm 2 , agrees well with standard model expectations. The measured value of the interference parameter, I = −1.01 ± 0.13(stat.) ± 0.12(syst.), is in good agreement with the standard model expectation of I SM = −1.09. Limits are placed on neutrino flavorchanging neutral currents. An upper limit on the muon-neutrino magnetic moment of 6.8 × 10 −10 µ Bohr is obtained using the νµ andνµ fluxes from π + and µ + decay.

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Section: The Neutrino Sourcementioning

confidence: 99%

Measurement of electron-neutrino electron elastic scattering

et al. 2001

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“…This possible difference of 0.11 is small enough that the uncertainties must be scrutinized closely. Below, we closely follow the analogous results for the percent-level corrections to the theoreticalν e + p → e + + n cross section [5,6] that are necessary to achieve agreement with experiment [7].While results from SNO [8,9] have not yet been reported, they have said at conferences [10] that they expect their flux measurement uncertainty to be dominated by the ∼ 3% theoretical uncertainty [11,12] on the neutrino-deuteron cross section, at least eventually.In the SNO proposal [8], the uncertainty on the neutrino-deuteron cross sections was assumed to be about 10% (for comparison, the experimental measurements of neutrino-deuteron cross sections have uncertainties of 10 -40% [13]). Since that time, the calculations have been redone by a number of authors, with decreasing quoted uncertainties.…”

mentioning

confidence: 99%

“…In the SNO proposal [8], the uncertainty on the neutrino-deuteron cross sections was assumed to be about 10% (for comparison, the experimental measurements of neutrino-deuteron cross sections have uncertainties of 10 -40% [13]). Since that time, the calculations have been redone by a number of authors, with decreasing quoted uncertainties.…”

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confidence: 99%

Normalization of the neutrino-deuteron cross section

Beacom¹,

Parke²

2001

Phys. Rev. D

182

304

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As is well-known, comparison of the solar neutrino fluxes measured in SuperKamiokande (SK) by ν + e − → ν + e − and in the Sudbury Neutrino Observatory (SNO) by νe + d → e − + p + p can provide a "smoking gun" signature for neutrino oscillations as the solution to the solar neutrino puzzle. This occurs because SK has some sensitivity to all active neutrino flavors whereas SNO can isolate electron neutrinos. This comparison depends crucially on the normalization and uncertainty of the theoretical charged-current neutrino-deuteron cross section. We address a number of effects which are significant enough to change the interpretation of the SK-SNO comparison. 26.65.+t, 13.15.+g, 14.60.Pq Both SK and SNO are sensitive to solar neutrinos with energies above about 5 MeV. In SK, these are detected by ν +e − → ν +e − , with possible (indistinguishable) contributions from all active flavors. In particular, if there are ν e → ν µ , ν τ oscillations, then the latter contribute to the measured flux with a cross section 6-7 times smaller than for ν e . In SNO, on the other hand, the detection reaction ν e + d → e − + p + p can isolate the ν e flux. . This measured flux may or may not include a contribution from ν µ , ν τ (in any linear combination, since they interact via the neutral current). In an energy-independent (as suggested by the absence of any distortion in the SK recoil electron spectrum [2]) twoflavor oscillation scenario, there are two extreme cases [3]. First, for ν e → ν s , the ν e flux in these units is 0.45, and the undetectable ν s (sterile neutrino) flux is 0.55. Second, for ν e → ν µ , ν τ , the ν e flux is 0.34, and the ν µ , ν τ flux 0.66, so that the measured flux in SK is 0.34 + 0.66/6 = 0.45. In the first case, SNO will measure 0.45, and in the second case, 0.34. More generally, these arguments can be rephrased as a ratio to eliminate the SSM flux normalization and its ≃ 20% uncertainty, since the total incident flux is the same for both SK and SNO. Also, a small correction is necessary for the hep neutrinos [1,4] that add to the dominant 8 B neutrinos. This possible difference of 0.11 is small enough that the uncertainties must be scrutinized closely. Below, we closely follow the analogous results for the percent-level corrections to the theoreticalν e + p → e + + n cross section [5,6] that are necessary to achieve agreement with experiment [7].While results from SNO [8,9] have not yet been reported, they have said at conferences [10] that they expect their flux measurement uncertainty to be dominated by the ∼ 3% theoretical uncertainty [11,12] on the neutrino-deuteron cross section, at least eventually.In the SNO proposal [8], the uncertainty on the neutrino-deuteron cross sections was assumed to be about 10% (for comparison, the experimental measurements of neutrino-deuteron cross sections have uncertainties of 10 -40% [13]). Since that time, the calculations have been redone by a number of authors, with decreasing quoted uncertainties. The most refined recent calculations are those of Butler,...

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“…Note that the understanding of neutrino-carbon reactions with neutrinos produced from the decay in flight of pions is still an open issue, for most of the theoretical calculations over-estimate the experimental value [22]. So far, measurements with lowenergy neutrinos have been performed in a few cases only, namely deuteron [23], carbon [24], and iron [25]. Systematic studies would be of great importance both for what concerns the interpolation from the MeV to the GeV neutrino energy range and the extrapolation to neutron-rich nuclei, as required in the astrophysical context.…”

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confidence: 99%