Top Quark

The most powerful cosmic rays in the universe currently have no explanation. New research suggests that exotic, self-annihilating particles in our own galaxy may hold the answer.

Top-quark pair production has been observed in lead-lead collisions at CERN's Large Hadron Collider (LHC) with the ATLAS detector, marking the first observation of this process in interactions between atomic nuclei.

Physicists report the first observations of quantum entanglement in quarks, the heaviest known fundamental particles, inside the Large Hadron Collider

Particle physicists have detected a novel decay of the Higgs boson for the first time, revealing a slight discrepancy in the predictions of the Standard Model and perhaps pointing to new physics beyond it. The findings are published in the journal Physical Review Letters.

"The activity is formidable, exciting, and scary."

The strong force binds quarks inside neutrons and protons, and holds atomic nuclei together.

The ALICE collaboration at the Large Hadron Collider (LHC) has made the first direct observation of the dead-cone effect—a fundamental feature of the theory of the strong force that binds quarks and gluons together into protons, neutrons and, ultimately, all atomic nuclei. In addition to confirming this effect, the observation, reported in a paper published today in Nature, provides direct experimental access to…

This new particle is so small it makes an atom look enormous.

One of the most surprising predictions of physics is entanglement, a phenomenon where objects can be some distance apart but still linked together. The best-known examples of entanglement involve tiny chunks of light (photons), and low energies.

New LHC results refute Fermilab's "hole" in the Standard Model. With new W-boson, top quark, and Higgs boson measurements, the LHC contradicts earlier Fermilab results. The Standard Model still holds..

This theoretical physicist and mathematician drops a new video several times a month, dispensing her dry wit and pithy wisdom to a loyal fan base of nerds across the internet.

Today, at the Moriond conference, the ATLAS and CMS collaborations have both presented the observation of a very rare process: the simultaneous production of four top quarks. They were observed using data from collisions during Run 2 of the Large Hadron Collider (LHC).

The Higgs boson is the only fundamental particle known to be scalar, meaning it has no quantum spin. This fact answers questions about our universe, but it also raises new ones.

Physicists from the CMS (Compact Muon Solenoid) Collaboration at CERN's Large Hadron Collider (LHC) have substantially improved the precision with which the mass of the top quark -- the heaviest known elementary particle - is measured.

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No.... Ok, ok, I will elaborate. But first I feel the need to explain what we are talking about here, to anybody who does not have a Ph.D. in particle physics and is still reading this column.Background: The Tevatron, CDF, and the W boson

A new analysis by the CDF collaboration is a bolt from the blue, finding that the W boson is significantly heavier than suggested by previous measurements and theoretical prediction

After 10 years of careful analysis and scrutiny, scientists of the CDF collaboration at the U.S. Department of Energy's Fermi National Accelerator Laboratory announced today that they have achieved the most precise measurement to date of the mass of the W boson, one of nature's force-carrying particles. Using data collected by the Collider Detector at Fermilab, or CDF, scientists have now determined the particle's…

While the Large Hadron Collider (LHC) at CERN is well known for smashing protons together, it is actually the quarks and gluons inside the protons—collectively known as partons—that are really interacting. Thus, in order to predict the rate of a process occurring in the LHC—such as the production of a Higgs boson or a yet-unknown particle—physicists have to understand how partons behave within the proton. This…

Last week, at the annual Rencontres de Moriond conference, the CMS collaboration presented a measurement of the effective leptonic electroweak mixing angle. The result is the most precise measurement performed at a hadron collider to date and is in good agreement with the prediction from the Standard Model.