Quarks in a sentence

The first generation includes up and down quarks, the second strange and charm quarks, and the third bottom and top quarks.

The quarks which determine the quantum numbers of hadrons are called valence quarks; apart from these, any hadron may contain an indefinite number of virtual (or sea) quarks, antiquarks, and gluons which do not influence its quantum numbers.

There are six: the common up and down quark, the strange and charm quarks, and the rarest top and bottom quarks.

All quarks carry an additive, conserved quantum number called a baryon number (B), which is + 1 3 for quarks and − 1 3 for antiquarks.

A neutron composed of two down quarks and an up quark, decays to a proton composed of a down quark and two up quarks, for example.

At the quark level, W − emission turns a down quark into an up quark, turning a neutron (one up quark and two down quarks) into a proton (two up quarks and one down quark).

By contrast, the up and down quarks transform according to the fundamental representation 2 of SU(2), whereas the anti-quarks transform according to the conjugate representation 2*.

For quarks, a measurement of the spin vector component along any axis can only yield the values +ħ/2 or −ħ/2; for this reason quarks are classified as spin- 1 2 particles.

Han and Nambu also assigned each quark color an integer electrical charge, so that the quarks were fractionally charged only on average, and they did not expect the quarks in their model to be permanently confined.

In theory, heptaquarks (5 quarks, 2 antiquarks), nonaquarks (6 quarks, 3 antiquarks), etc. could also exist.

Isospin and charge main Combinations of one u, d or s quarks and one u, d, or s antiquark in configuration form a nonet Combinations of one u, d or s quarks and one u, d, or s antiquark in configuration also form a nonet.

More precisely, the down-type quark becomes a quantum superposition of up-type quarks: that is to say, it has a possibility of becoming any one of the three up-type quarks, with the probabilities given in the CKM matrix tables.

Most of a hadron's mass comes from the gluons that bind the constituent quarks together, rather than from the quarks themselves.

Pions are the lightest mesons (and, more generally, the lightest hadrons ), because they are composed of the lightest quarks (the u and d quarks).

Quarks have fractional charges of either − or +, but free-standing quarks have never been observed (the theoretical reason for this fact is asymptotic freedom ).

Sea quarks form when a gluon of the hadron's color field splits; this process also works in reverse in that the annihilation of two sea quarks produces a gluon.

The baryon number (B) is + 1 3 for all quarks, as baryons are made of three quarks.

The heavier quarks rapidly change into up and down quarks through a process of particle decay : the transformation from a higher mass state to a lower mass state.

These rules consider the up ( ), down ( ) and strange ( ) quarks to be light and the charm ( ), bottom ( ), and top ( ) quarks to be heavy.

The two or three quarks are the excess of quarks vs. antiquarks in hadrons, and vice versa in anti-hadrons.