Don Lincoln

Eight is enough

CMS goes looking for particle physics events that produce eight particles produced by new physics.

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.