[ExI] 1st sign of elusive 'triangle singularity' shows particles swapping identities in mid-flight

[John Grigg]

"Physicists sifting through old particle accelerator data have found
evidence of a highly-elusive, never-before-seen process: a so-called
triangle singularity.

First envisioned by Russian physicist Lev Landau in the 1950s, a triangle
singularity refers to a rare subatomic process where particles exchange
identities before flying away from each other. In this scenario, two
particles — called kaons — form two corners of the triangle, while the
particles they swap form the third point on the triangle.

"The particles involved exchanged quarks and changed their identities in
the process," study co-author Bernhard Ketzer, of the Helmholtz Institute
for Radiation and Nuclear Physics at the University of Bonn, *said in a
statement* <https://www.uni-bonn.de/en/news/200-2021>.

And it's called a singularity because the mathematical methods for
describing subatomic particle interactions break down.

If this singularly weird particle identity-swap really happened, it could
help physicists understand the *strong force*
<https://www.livescience.com/48575-strong-force.html>, which binds the
nucleus together."

https://www.livescience.com/first-evidence-triangle-singularity
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