Recent results from the T2K experiment on CP violation in the lepton sector

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• Constantinos Andreopoulos (Liverpool & STFC Rutherford Appleton Laboratory)
• Tuesday 07 March 2017, 15:00-16:00
• Rutherford Seminar Room B.

If you have a question about this talk, please contact Alexander Mitov.

T2K is a long-baseline neutrino oscillation experiment in Japan. An intense muon-(anti)neutrino beam produced at the Japan Proton Accelerator Research Complex (J-PARC) in Tokai is sent towards the Mozumi mine some 295 km away. There, the giant Super-Kamiokande water Cherenkov detector sees a narrow-band beam peaked at 600 MeV. The baseline to energy ratio is finely tuned for studying oscillations at the so-called atmospheric neutrino squared-mass splitting. The beam is also sampled 280 m downstream of the neutrino production target by a series of finely-segmented solid-scintillator and time-projection-chamber detectors. Observing changes in the neutrino beam between the near and far detectors allows oscillation parameters to be accurately extracted.

Running in neutrino mode, T2K performed the most precise measurements of muon-neutrino disappearance and observed, for the first time, the appearance of electron neutrinos in a muon-neutrino beam, Since 2014, T2K has been running primarily in antineutrino mode aiming to obtain direct evidence for neutrino CP invariance violation. I will discuss the T2K analysis strategy and sensitivity in detail, and present recently published results from a joint 3-flavour analysis of all neutrino and antineutrino data which disfavours CP conservation at 90% C.L. Finally, I will discuss future prospects and the potential extension of the T2K programme.

This talk is part of the Cavendish HEP Seminars series.

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• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
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