Talk:T2K experiment

T2K experiment was a Natural sciences good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.

Article milestones
Date	Process	Result
July 12, 2021	Good article nominee	Not listed
January 5, 2022	Good article nominee	Not listed

Current status: Former good article nominee

Untitled[edit]

This page still needs to be cleaned up quite a bit. Also the information should be verified and referenced. Dgiraffes (talk) 07:38, 2 December 2008 (UTC)[reply]

Aug 14 / 08 added to the FGD description. Still needs further description and clarification. —Preceding unsigned comment added by Dgiraffes (talk • contribs) 20:33, 14 August 2008 (UTC)[reply]

July 30 / 07 posted a brief discription. Needs much elaboration.

Aug 01 /07 posted a outline with introductory info.

Apr 01/2020 - the whole article significantly extended and updated. References to each paragraph added. — Preceding unsigned comment added by Batmann (talk • contribs) 13:27, 3 April 2020 (UTC)[reply]

Electron neutrino appearance[edit]

This experiment checks for the appearance of electron neutrinos from myon neutrinos by the mechanism of neutrino oscillation. Is there any article on the internet which explains why this channel would be excluded?

ν
_μ +
e⁻
→
μ⁻
+
ν
_e

This reaction would proceed by a W- exchange and I don't quite see how it can be distinguished from a neutrino oscillation, at least not with this experimental setup. An appearance of electron neutrinos would be measured by the far detector, but the electron neutrinos could be the product of the above reaction. Phr en (talk) 12:57, 20 August 2013 (UTC)[reply]

This would require two weak interactions (one in the material before the detector and one in the detector), an extremely rare process compared to the single interaction in the detector with neutrino mixing. The dominant source of background is direct production in the beam (see the publication. In addition, it cannot happen with antineutrinos and you can calculate precisely how frequently it happens. Its energy/length dependence is different as well but the detector is not sensitive to that yet. --2003:57:8A06:7E01:E57A:CE1C:4494:ADF4 (talk) 16:49, 20 August 2013 (UTC)[reply]

Neutrino cross sections measurements for all kinds of reaction channels are very rare. It may appear a bit hasty to contribute "appearances" or "disappearances" of neutrinos to oscillations, at least until real oscillations over several cycles have been observed (not only "appearances" or "disappearances"), see for example [1], [2] etc, or for antineutrinos [3]. Phr en (talk) 15:18, 21 August 2013 (UTC)[reply]