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<p>We describe the measurement of muon neutrino disappearance due to</p><p>neutrino
oscillation using the Tokai-2-Kamiokande (T2K) experiment's Run 1-4 (6.57×10<super>20</super>
POT)</p><p>data set. We analyze the data using the conventional</p><p>Pontecorvo-Maki-Nakagawa-Sakata
(PMNS) mixing</p><p>matrix for the three Standard Model neutrinos. The output of the</p><p>analysis
is a measurement of the parameters sin<super>2</super>θ<sub>23</sub>, Δm<super>2</super><sub>32</sub>
for the normal hierarchy and sin<super>2</super>θ<sub>23</sub>, Δm<super>2</super><sub>13</sub>
for</p><p>the inverted hierarchy. The best-fit oscillation</p><p>parameters for the
normal hierarchy are found to be</p><p>(sin<super>2</super>θ<sub>23</sub>, Δm<super>2</super><sub>32</sub>)
= ( 0.514, 2.51×10<super>-3</super> eV<super>2</super>/c<super>4</super>}).
The 90% 1D confidence interval -- determined for both parameters</p><p>using the Feldman-Cousins
procedure -- is for the normal hierarchy</p><p>0.428 < sin<super>2</super>θ<sub>23</sub>
< 0.598 and</p><p>2.34×10<super>-3</super> eV<super>2</super>/c<super>4</super>
< Δm<super>2</super><sub>32</sub> < 2.68\times10^{-3} eV<super>2</super>/c<super>4</super>.
</p><p>For the inverted hierarchy, the best-fit oscillation parameters are</p><p>(sin<super>2</super>θ<sub>23</sub>,
Δm<super>2</super><sub>13</sub>) = (0.511, 2.48×10<super>-3</super> eV<super>2</super>/c<super>4</super>.
The 90\% 1D Feldman-Cousins confidence intervals for the inverted hierarchy are 2.31×10<super>-3</super>
eV<super>2</super>/c<super>4</super> < \Delta m^2_{13} < 2.64×10<super>-3</super>
eV<super>2</super>/c<super>4</super>.</p>
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