Don Lincoln

Don Lincoln is a Fermilab scientist.

How is examining a particle decay pattern like unfolding a piece of origami? A recent CMS finding reminds us that examining particle decays can be as much about what you don’t see — the folds and creases — as the result.

QCD is holding its own. Even at energies 63 percent higher compared to the LHC’s first run, the data produced during the current, second run bears out the decades-old predictions of QCD.

The particles resulting from collisions of lead nuclei with protons at the LHC allow scientists to explore possible novel nuclear matter.

In their search for dark matter, CMS scientists invented new measurement variables, called razor variables, to enhance their capability to identify events containing dark matter.

Busy bees

CMS scientists look for four b‘s — bottom quarks that might point the way to Higgs boson pairs.

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.

CMS goes looking for unparticles and dark matter, studying events in which a Z boson was created, as well as undetected energy that would be the signal of either a dark matter particle or unparticle escaping.

Are leptons more like rocks or hornet’s nests? CMS set out to find whether leptons might have any component parts by colliding them at very high energies.

Lead bottom

The nice thing about the LHC research program is that it allows scientists to investigate many phenomena.

Bigger is better

One of the first CMS papers for publication using data recorded in 2015 was on the production rate of top quarks. This is a breathtaking achievement.