CERN's new particle Xi-cc++ opens up physics mystery
A new particle detected in the atom smasher at CERN has sent physicists scurrying back to revisit an experiment from more than 10 years ago. The new particle, called Xi-cc++ (pronounced sigh-see-see-plus-plus), will help scientists better understand quantum physics. And its discovery has rekindled interest in a US experiment that claimed evidence for a similar Xi particle, back in 2002. Xi-cc++ is a type of subatomic particle called a baryon, which is made up of three quarks — some of the fundamental building blocks of matter.