## Does a gluon decay?

A gluon does not decay in a standard sense. There are a number of reasons, but the simplest is to consider the decay of any massless particle. The energy-momentum vector for a massless particle is (E, →pc) which with E = ℏω means Pμ = ℏ(ω, ω ˆn).

Can up quarks decay?

Up and down quarks can decay into each other by emission of a W boson (this is the origin of beta decay due to the fact that the W can, depending on its type, decay into electrons, positrons and electron (anti-)neutrinos, ).

### What does an up quark decay into?

Up quark

Composition Elementary particle
Theorized Murray Gell-Mann (1964) George Zweig (1964)
Discovered SLAC (1968)
Mass 2.2+0.5 −0.4 MeV/c2
Decays into Stable or Down quark + Positron + Electron neutrino

Do gluons make up quarks?

A gluon (/ˈɡluːɒn/) is an elementary particle that acts as the exchange particle (or gauge boson) for the strong force between quarks. It is analogous to the exchange of photons in the electromagnetic force between two charged particles. Gluons bind quarks together, forming hadrons such as protons and neutrons.

#### How does up quark change to down quark?

Quark can mix via the weak interaction (this is described by the CKM matrix). So in a proton up quark has a non-zero probability of emitting W+ boson, neutrino and turn into a down quark.

How do gluons hold quarks together?

The strong interaction is mediated by the exchange of massless particles called gluons that act between quarks, antiquarks, and other gluons. Gluons are thought to interact with quarks and other gluons by way of a type of charge called color charge.

## Why is it difficult to separate quarks and gluons?

Because the strong nuclear force is so powerful, it makes it extremely difficult to separate quarks and gluons. Because of this, quarks and gluons are bound inside composite particles. The only way to separate these particles is to create a state of matter known as quark-gluon plasma.

Why does a gluon not decay?

In the standard model of particle physics zero mass elementary particles, of which the gluon is one if you look at the table, cannot decay. This is because the standard model is formulated on fourvectors of special relativity, and has to obey basic quantum mechanical conservation laws, as energy and momentum conservation.

### What is a quark-gluon plasma?

An image of the debris left over after the creation of a quark-gluon plasma in the collision of two nuclei at Brookhaven National Laboratory. Quarks and gluons are the building blocks of protons and neutrons, which in turn are the building blocks of atomic nuclei.

Why do quarks have mass?

Quarks are the only elementary particles to experience all the known forces of nature and to have a fractional electric charge. The interaction between quarks and gluons is responsible for almost all the perceived mass of protons and neutrons and is therefore where we get our mass.

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