What is top quark Antitop quark production?
The top quark was discovered in 1995 by the CDF and DØ experiments at Fermilab. However, once produced, the top (or antitop) can decay only through the weak force. It decays to a W boson and either a bottom quark (most frequently), a strange quark, or, on the rarest of occasions, a down quark.
Who predicted the top quark?
Predicting the Top Quark The top quark’s existence was predicted indirectly by Makoto Kobayashi and Toshihide Maskawa in 1973, 22 years before its experimental observation.
Which is the heaviest quark?
The CMS collaboration has recently released new results on how the top quark and Higgs boson interact, and this required a much deeper understanding of the production of top quarks together with bottom quarks. The two heaviest known elementary particles, the top (t) quark and the Higgs (H) boson, are deeply connected.
What are charm quark used for?
At facilities known as “charm factories,” large numbers of charm-containing particles can be produced with little contamination from other types of particles. This allows scientists to observe subatomic processes with great precision, and may reveal subtle signs of new physics phenomena predicted by theorists.
How does a top quark turn into an antibottom quark?
Single top quarks. This can happen in several ways (called channels): either an intermediate W-boson decays into a top and antibottom quark (“s-channel”) or a bottom quark (probably created in a pair through the decay of a gluon) transforms to a top quark by exchanging a W-boson with an up or down quark (“t-channel”).
What kind of interaction does the top quark have?
The top quark interacts primarily by the strong interaction, but can only decay through the weak force. It decays to a W boson and either a bottom quark (most frequently), a strange quark, or, on the rarest of occasions, a down quark. The Standard Model predicts its mean lifetime to be roughly 5 × 10−25 s.
What is the Standard Model prediction for the top quark?
The Standard Model prediction (at next-to-leading order with mt = 175 GeV/c2) is 6.7–7.5 pb. The W bosons from top quark decays carry polarization from the parent particle, hence pose themselves as a unique probe to top polarization.
Where does the mass of the top quark come from?
The top quark, sometimes also referred to as the truth quark, (symbol: t) is the most massive of all observed elementary particles. It derives its mass from its coupling to the Higgs Boson. This coupling
