LHC

U.S. CMS physicists from Fermilab and associated universities collaborating under the umbrella of the LPC make up a team that is the first to perform a new kind of search for “stealthy” supersymmetry that does not result in an obvious signature of large energy imbalance. Instead, the LPC team is looking for collisions that result in an unusually large number of particles in the detector. CMS recently published a briefing explaining their analysis.

From CERN, March 16, 2021: The collaboration of TOTEM researchers at CERN and DØ researchers at Fermilab have discovered the oddereon – an elusive three-gluon state predicted almost 50 years ago.

From the CERN Courier, March 9, 2021: The discovery of an odderon, predicted to exist almost 50 years ago, was the result of a collaboration between CERN and Fermilab using data from the Large Hadron Collider as well as Fermilab’s DZero experiment. The results were presented at a CERN physics talk and are reported in a joint publication on the observations that were made in December 2020.

Higgs-boson pairs could help scientists understand the stability of our universe. The trick is finding them.

Symmetry writer Sarah Charley answers life and relationship questions through the lens of fundamental physics. Instead of using analogies from elsewhere in life to explain science, she’ll use physics analogies to explore human nature. This time, she tackles unwanted gifts, when to give up on a dream and how friendships might be like Newtonian mechanics.

Later this decade, the Large Hadron Collider will be upgraded to the High-Luminosity LHC. What does “luminosity” mean in particle physics, and why measure it instead of collisions?

From New Scientist, Jan. 25, 2021: The Big Bang left us the universe — and a major set of mysteries around antimatter, dark matter, dark energy, and cosmic inflation. While the Large Hadron Collider looks at what the laws of physics were like a trillionth of a second after the Big Bang, Dan Hooper, head of theoretical astrophysics at Fermilab, thinks the answers to these puzzles may depend on better understanding that first fraction of a second — even closer to the universe’s beginning.

From CERN, Jan. 26, 2021: This week marks the 50th anniversary of the first proton collisions in CERN’s Intersecting Storage Rings, the first hadron collider ever built. To celebrate, see hadron colliders of the last half-century — including the Tevatron and the Large Hadron Collider — through a historical lens, with an eye toward the quest for high luminosity and new energy frontiers.

Scientists wrote over 1500 letters sharing what they hope the next decade of particle physics will bring. One motif: studying long-lived particles in a variety of ways — including an idea using a detector atop the CMS experiment at the Large Hadron Collider at CERN.

The ATLAS collaboration has begun to publish likelihood functions, information that will allow researchers to better understand and use their experiment’s data in future analyses.