<div dir="ltr"><p style="font-family:"Open Sans",Arial,sans-serif;margin:0px 0px 1em;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:1.5;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)">"Physicists sifting through old particle accelerator data have found evidence of a highly-elusive, never-before-seen process: a so-called triangle singularity.</p><div id="gmail-ad-unit-1" class="gmail-ad-unit" style="font-family:"Open Sans",Arial,sans-serif;margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)"></div><p style="font-family:"Open Sans",Arial,sans-serif;margin:0px 0px 1em;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:1.5;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)">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. </p><p style="font-family:"Open Sans",Arial,sans-serif;margin:0px 0px 1em;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:1.5;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)">"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, <a href="https://www.uni-bonn.de/en/news/200-2021" target="_blank" class="gmail-hawk-link-parsed" style="font-family:inherit;margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;vertical-align:baseline;color:rgb(2,108,162);text-decoration-line:none"><u style="font-family:inherit;margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;vertical-align:baseline">said in a statement</u></a>. </p><p style="font-family:"Open Sans",Arial,sans-serif;margin:0px 0px 1em;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:1.5;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)">And it's called a singularity because the mathematical methods for describing subatomic particle interactions break down. </p><div id="gmail-ad-unit-2" class="gmail-ad-unit" style="font-family:"Open Sans",Arial,sans-serif;margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)"></div><p style="font-family:"Open Sans",Arial,sans-serif;margin:0px 0px 1em;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:1.5;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)">If this singularly weird particle identity-swap really happened, it could help physicists understand the <a href="https://www.livescience.com/48575-strong-force.html" class="gmail-hawk-link-parsed" style="font-family:inherit;margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;vertical-align:baseline;color:rgb(2,108,162);text-decoration-line:none"><u style="font-family:inherit;margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;vertical-align:baseline">strong force</u></a>, which binds the nucleus together."</p><p style="font-family:"Open Sans",Arial,sans-serif;margin:0px 0px 1em;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:1.5;font-size:16px;vertical-align:baseline;color:rgb(51,51,51)"><a href="https://www.livescience.com/first-evidence-triangle-singularity">https://www.livescience.com/first-evidence-triangle-singularity</a><br></p></div>