The T2K neutrino decay volume

Neutrino oscillations have been a hot topic in recent decades, as experiments have revealed large mixing in the neutral lepton sector. T2K is a long baseline high intensity neutrino oscillation experiment employing an off-axis beam to search for the as yet unobserved appearance of electron neutrinos (ν _e ) in a muon neutrino (ν _μ ) beam. The neutrino beam originates at the J-PARC facility in Tokai, Japan, and the beam composition is measured by the Super-Kamiokande (SK) detector, located at a distances 295 km.  The SK data is searched for an excess of ν _e , which constrains sin ² (2θ ₁₃ ), the parameter governing the amplitude of oscillation from ν _μ to ν _e .; This amplitude is of particular interest since it scales CP violating terms from the lepton mixing matrix. In this talk, I will present results from the first T2K physics run in 2010 with 3.23 x 10 ¹⁹ protons on target, and prospects for future results as T2K progresses towards a world's best sensitivity to θ ₁₃ .