Earlier today the CMS paper titled “Observation of ttH Production” was accepted for publication by Physical Review Letters. In this article, the CMS collaboration presented the first observation of the coupling between the Higgs boson and the top quark. The strength of this coupling as measured by CMS is consistent with the Standard Model expectation. This observation connects for the first time directly the two heaviest elementary particles of the Standard Model: the top quark, which was discovered in 1995…
top quark
Fermilab has placed a capstone on its study of the forward-backward asymmetry, and the measurements and theory now agree.
The hunt for the top quark at Fermilab was heating up in 1994 when scientist Mike Albrow and his colleagues on the CDF experiment felt they were close to cornering the last, undiscovered member of the quark family. Albrow tells the story leading to the discovery of the particle by CDF and DZero.
Five Fermilab scientist-users, including a lab employee, co-authored Physics-Uspekhi‘s Best Article of 2015.
What is the matrix element, and why is it useful for measuring the top quark?
DZero measured the average direction of spins in top pairs produced at the Tevatron using its full data set.
You’ve got your pole masses, and you’ve got your MC masses. DZero recently measured the top quark’s pole mass. Read on to learn the difference.
CDF has completed its last measurement of top quark forward-backward asymmetry, using the full Tevatron Run II data set, in the scenario where both the top quark and antiquark decay leptonically.
It’s hard to believe that point-like particles have spin. Yet that’s exactly what DZero recently measured – the spin of top quarks – to learn more about the details of top quark pair production.
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.