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Event Excess in the MiniBooNE Search for $$\bar \nu_\mu \rightarrow \bar \nu_e$$ Oscillations

Journal Article · · Phys.Rev.Lett.
The MiniBooNE experiment at Fermilab reports results from a search for $$\bar \nu_\mu \rightarrow \bar \nu_e$$ oscillations, using a data sample corresponding to $$5.66 \times 10^{20}$$ protons on target. An excess of $$20.9 \pm 14.0$$ events is observed in the energy range $$475<E_\nu^{QE}<1250$$ MeV, which, when constrained by the observed $$\bar \nu_\mu$$ events, has a probability for consistency with the background-only hypothesis of 0.5\%. On the other hand, fitting for $$\bar{\nu}_{\mu}\rightarrow\bar{\nu}_e$$ oscillations, the best-fit point has a $$\chi^2$$-probability of 8.7\%. The data are consistent with $$\bar \nu_\mu \rightarrow \bar \nu_e$$ oscillations in the 0.1 to 1.0 eV$^2$ $$\Delta m^2$$ range and with the evidence for antineutrino oscillations from the Liquid Scintillator Neutrino Detector at Los Alamos National Laboratory.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
MiniBooNE
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1892201
Report Number(s):
FERMILAB-PUB-10-225-E; LA-UR-10-04610; arXiv:1007.1150; oai:inspirehep.net:860589
Journal Information:
Phys.Rev.Lett., Journal Name: Phys.Rev.Lett. Vol. 105
Country of Publication:
United States
Language:
English

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