arXiv subjects

R. L. Imlay

Publications and source records attributed to R. L. Imlay.

3 recordsLinked to original sources

arXiv2010

Search Capability for $η\to ν_{e,τ}\barν_{e,τ}$ Decays in Cubic Kilometer Neutrino Detectors

We investigate the discovery potential of cubic kilometer neutrino observatories such as IceCube to set stringent limits on the forbidden decays $η\toν_e\barν_e$ and $η\toν_τ\barν_τ$. The signatures for these decays are cascade events resulting from the charged-current reactions of $ν_e, ν_τ$, $\barν_e$ and $\barν_τ$ on nuclei in such detectors. Background cascade events are mainly due to $ν_e$'s from atmospheric $μ$, $K^+$, and $K^{0}_S$ decays and to a lesser extent from atmospheric $ν_μ$ neutral current interactions with nuclei. A direct upper limit for the branching ratio $η\to ν_{e,τ} \barν_{e,τ}$ of $4.5\times10^{-4}$ at 90% CL can be achieved.

hep-ex↗

arXiv2005

Tests of Lorentz violation in muon antineutrino to electron antineutrino oscillations

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 ${\barν}_e$ in a beam of ${\barν}_μ$. 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.

hep-ex↗

arXiv2003

Search for $π^0 \to ν_μ\barν_μ$ Decay in LSND

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 $ν_μ$ and/or $\barν_μ$ on C and H in the LSND detector. No beam related muon background is expected in this energy regime. Within an analysis framework of $π^0 \to ν_μ\barν_μ$, we set a direct upper limit for this branching ratio of $Γ(π^0 \to ν_μ\barν_μ) / Γ(π^0 \to all) < 1.6 \times 10^{-6}$ at 90% confidence level.

hep-ex↗