b quark

b quark

[′bē ‚kwärk]
(particle physics)
References in periodicals archive ?
The top decays into a W boson and a b quark and the Higgs decays further into for example two photons, four leptons, a b quark and an anti-b quark, or pairs of W or Z bosons or tau leptons.
The Higgs bosons decay to a b quark and an anti-b quark is the one that occurs most frequently, but is also hard to disentangle from the abundance of other particles visible in the detector during a collision.
Since the late 1990s, physicists have staged an unprecedented, international effort to determine properties of B mesons--those mesons that contain the second-heaviest type of quark, the bottom or b quark. Large particle accelerators in California and Japan are participating in that work (SN: 3/3/01, p.
So, physicists must turn to theory to distinguish those features due exclusively to the decay of the b quark from the elaborate dance of quarks, antiquarks, and gluons inside a decaying B meson.
Ideally, physicists would study b quarks isolated from all other particles because it's in the details of the disintegrations of those quarks themselves that researchers expect any signs of new phenomena to be most apparent.
Therefore, the systems that are best suited for study in quark models are the heavy quark system which contain c or b quarks. The bare masses of u, d, and s quarks are 2 MeV, 4 MeV, and 96 MeV, respectively [2].
This additional requirement results in an increased search sensitivity to narrow resonances preferentially decaying into pairs of b quarks.
At the workshop many physicists spoke of the importance of studying the behavior of the B particles, the family of things made from b quarks. Another example is the z and w particles that play a central role in electroweak theory.