Recent Results From K2K

(11 November 2004)

107 observed $\nu_\mu -> \nu_\mu$ events

$151 {}^{+12}_{-10}$ expected events without oscillations

$5 \times 10^{-5} (4.0\sigma)$ probability of a statistical fluctuation (no oscillations)

$2.6 \times 10^{-3}$ probability of a statistical fluctuation (no oscillations) of rate

$7.4 \times 10^{-3}$ probability of a statistical fluctuation (no oscillations) of spectrum

best-fit: $\sin^22\theta = 1.0$ $\Delta{m}^2 = 2.8 \times 10^{-3} \mathrm{eV}^2$


The reconstructed $E_\nu$ distribution for the SK 1-ring $\mu$ -like sample. Points with error bars are data. The solid line is the best fit spectrum. The dashed line is the expected spectrum without oscillation. These histograms are normalized by the number of events observed (57).	Allowed regions of oscillation parameters. Dashed, solid and dot-dashed lines are 68.4%, 90% and 99% C.L. contours, respectively.

Authors:
Carlo Giunti / giunti@to.infn.it
Marco Laveder / marco.laveder@pd.infn.it

Last Update: Fri 10 Feb 2012, day 41 of the year 2012, 09:09:39 UTC