From Gizmodo, Feb. 25, 2016: Physicists from the DZero collaboration have announced the discovery of a new particle, believed to be part of an exotic family called “tetraquarks.”

Looking forward

Which directions do postcollision electrons take at the Large Hadron Collider, and how often do they go one way versus another? The answer gives a way to probe electroweak theory.

Why three?

There are a lot of mysteries in particle physics, but one of the most curious is called the flavor problem. Physicists use the word flavor to mean the different varieties of particles. As readers of this column will recall, there are six types of quarks: up and down, charm and strange, and top and bottom. Up and down quarks are found in ordinary matter and are called generation I. The other two generations are very similar in their properties compared…

Never alone

Scientists have tuned models to describe the average properties of the mesons created in the fragmentation process, CDF watched what happens to the end of the string that remains immediately after the part connected to the heavy quark is broken.