Public Release: 

Two new baryon particles discovered in agreement with York U prediction

York University

TORONTO, November 19, 2014 - Today an international team of researchers announced the discovery of two new particles in the baryon family, which makes them cousins of the familiar proton and neutron. The LHCb collaboration at CERN, the European Organization for Nuclear Research, used CERN's Large Hadron Collider to make these discoveries.

The masses of these particles, named Xi_b'- and Xi_b*- had been predicted in a paper published in 2009 by York University Professor Randy Lewis and Richard Woloshyn, scientist at the TRIUMF Lab in Vancouver, using a supercomputer approach called lattice QCD.

"The prediction of the existence and masses of these particles is a tour de force of theoretical and computational physics. It is a fantastic accomplishment of Randy's, who is working at the very edge of theoretical physics as well as pushing supercomputer capabilities to the limit," said Roman Koniuk, Chair of the Department of Physics & Astronomy at York University.

"This uses the most fundamental theory of quarks and gluons to explain the quantum physics inside these tiny new Xi particles," said Lewis.

Lewis is continuing his use of lattice QCD to study other combinations of quarks and gluons that can also be pursued by experimental laboratories like CERN.


York University is helping to shape the global thinkers and thinking that will define tomorrow. York U's unwavering commitment to excellence reflects a rich diversity of perspectives and a strong sense of social responsibility that sets us apart. A York U degree empowers graduates to thrive in the world and achieve their life goals through a rigorous academic foundation balanced by real-world experiential education. As a globally recognized research centre, York U is fully engaged in the critical discussions that lead to innovative solutions to the most pressing local and global social challenges. York U's 11 faculties and 27 research centres are thinking bigger, broader and more globally, partnering with 288 leading universities worldwide. York U's community is strong, with 55,000 students, 7,000 faculty and staff, and more than 250,000 alumni.

Media Contact: Robin Heron, Media Relations, York University, 416 736 2100 ext. 22097 /

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.