Phys.Rev.D72:076004,2005 A recently developed Standard-Model Extension (SME) formalism for neutrino
oscillations that includes Lorentz and CPT violation is used to analyze the
sidereal time variation ...of the neutrino event excess measured by the Liquid
Scintillator Neutrino Detector (LSND) experiment. The LSND experiment,
performed at Los Alamos National Laboratory, observed an excess, consistent
with neutrino oscillations, of ${\bar\nu}_e$ in a beam of ${\bar\nu}_\mu$. It
is determined that the LSND oscillation signal is consistent with no sidereal
variation. However, there are several combinations of SME coefficients that
describe the LSND data; both with and without sidereal variations. The scale of
Lorentz and CPT violation extracted from the LSND data is of order $10^{-19}$
GeV for the SME coefficients $a_L$ and $E \times c_L$. This solution for
Lorentz and CPT violating neutrino oscillations may be tested by other short
baseline neutrino oscillation experiments, such as the MiniBooNE experiment.
Phys.Rev.Lett.98:052301,2007 We report the first precision measurement of the proton electric to magnetic
form factor ratio from spin-dependent elastic scattering of longitudinally
polarized ...electrons from a polarized hydrogen internal gas target. The
measurement was performed at the MIT-Bates South Hall Ring over a range of
four-momentum transfer squared $Q^2$ from 0.15 to 0.65 (GeV/c)$^2$.
Significantly improved results on the proton electric and magnetic form factors
are obtained in combination with previous cross-section data on elastic
electron-proton scattering in the same $Q^2$ region.
Phys.Rev.Lett.92:091801,2004 We observe a net beam-excess of $8.7 \pm 6.3$ (stat) $\pm 2.4$ (syst) events,
above 160 MeV, resulting from the charged-current reaction of $\nu_{\mu}$
and/or ...$\bar\nu_{\mu}$ on C and H in the LSND detector. No beam related muon
background is expected in this energy regime. Within an analysis framework of
$\pi^0 \to \nu_{\mu}\bar\nu_{\mu}$, we set a direct upper limit for this
branching ratio of $\Gamma(\pi^0 \to \nu_\mu \bar\nu_\mu) / \Gamma(\pi^0 \to
all) < 1.6 \times 10^{-6}$ at 90% confidence level.
We report new measurements of the neutron charge form factor at low momentum transfer using quasielastic electrodisintegration of the deuteron. Longitudinally polarized electrons at an energy of 850 ...MeV were scattered from an isotopically pure, highly polarized deuterium gas target. The scattered electrons and coincident neutrons were measured by the Bates Large Acceptance Spectrometer Toroid (BLAST) detector. The neutron form factor ratio \(G^{n}_{E}/G^{n}_{M}\) was extracted from the beam-target vector asymmetry \(A_{ed}^{V}\) at four-momentum transfers \(Q^{2}=0.14\), 0.20, 0.29 and 0.42 (GeV/c)\(^{2}\).
A recently developed Standard-Model Extension (SME) formalism for neutrino oscillations that includes Lorentz and CPT violation is used to analyze the sidereal time variation of the neutrino event ...excess measured by the Liquid Scintillator Neutrino Detector (LSND) experiment. The LSND experiment, performed at Los Alamos National Laboratory, observed an excess, consistent with neutrino oscillations, of \({\bar\nu}_e\) in a beam of \({\bar\nu}_\mu\). It is determined that the LSND oscillation signal is consistent with no sidereal variation. However, there are several combinations of SME coefficients that describe the LSND data; both with and without sidereal variations. The scale of Lorentz and CPT violation extracted from the LSND data is of order \(10^{-19}\) GeV for the SME coefficients \(a_L\) and \(E \times c_L\). This solution for Lorentz and CPT violating neutrino oscillations may be tested by other short baseline neutrino oscillation experiments, such as the MiniBooNE experiment.
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