T2K, Tokai-to-Kamioka, is an experiment studying neutrinos, the mysterious particles that pass by the dozens (of trillions) through earth each second without stopping. In some way its name reflects this behaviour of neutrinos: Tokai and Kamioka are two japanese villages separated by 300 kilometers, but when an accelerator at one of them creates and sends underground streams of neutrinos to the other, they pass through the 300km of solid rock undisturbed. Then they reach T2K’s vast tank of water, where very very few happen to fall heads-on on the nuclei of atoms, giving off a signal that the experiment records.
T2K has been working for decades with those tiny weirdos, steadily finding out more about them. Now it announced that things are progressing in its current and quite important mission: to see whether both neutrinos and antineutrinos, their antimatter equivalents, behave in exactly the same way or if they obey CP-violation.
In brief, CP-violation is the very enigmatic fact that some nuclear processes don’t happen in the same way in matter and antimatter. It has been observed in quarks but seeing whether it holds for neutrinos hadn’t been easy, for reasons that should be obvious.
T2K, however, takes advantage of one peculiar feature of neutrinos: there are three types of them and as time passes each neutrino changes its type. The Tokai accelerator generates only one type of neutrinos (or antineutrinos), so the experiment can measure this change, even if in handfuls.
When all’s said and done, T2K can tell if there is any difference in this behaviour between neutrinos and antineutrinos. Actually it’s been at it for a few years now, and last month it announced its results so far.
It has not seen any undoubtable CP-violation yet but it's also seen some hints of it. The important part is that it seems to be halfway done with the measurements it must do before concluding the matter. So it made everybody hopeful that a couple more years and we’ll know at last what’s really going on, at least in this aspect of life.
This article comes from a post on my blog The Ph-word.
Neutrinos and their mysteries... Hopefully the future will shed some light on their mass generation mechanism. I am personally working more and more on neutrinos, at least from the proton collider standpoint (this is still a small amount of my time, but more than 0 ;) ).
Are you part of T2K?
I think many people expect that if some of the already known particles will show us a way forward ... this will be the neutrinos! So many mysteries converge on them.
No, I'm not a member of T2K (that would be cool though!).
Among other options ;)
What are you exactly working on, if I may ask?
I have worked on beyond-the-Standard-Model accelerator-based searches (mostly Z' and 4th gen. quarks) and on direct dark matter detection (mostly axions). At the moment I am going through a data science phase!
As many in the field... This is definitely not the golden age of particle physics at the moment :(
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