Up+Down Scalar Meson: Isospin SU(3) & Low Energies

In summary, the conversation discusses the absence of mesons made up of only up and down quarks and the reason for this based on isospin SU(3). It also mentions the mixing of particles and its effect on the composition of mesons. The expert is unable to comment on the rest of the question.
  • #1
ddimensoes
3
0
Why is there no meson made up by only up and down quarks but even under parity? Is there something that forbids its existence?
The pions are all axial (pseudoscalar) mesons. As we go higher in energy, there are such "flavour-pure" mesons. Is this a consequence of the almost-unbroken isospin SU(3)? If this is so, why can't I find such "flavour-pure" mesons at low energies?
 
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  • #2
All mesons are made up of quark plus antiquark. You can't have a two quark particle since the color charge must add up to white.

I can't comment on the rest of your question - beyond my expertise.
 
  • #3
Particles mix, and the closer they are in mass, the more they mix. So you don't have a pure uubar or ddbar state because they mix, and the eta adds some ssbar, etc. The same thing happens with the scalars.
 

1. What is an Up+Down Scalar Meson?

An Up+Down Scalar Meson is a type of subatomic particle composed of an up quark and a down quark. It belongs to the meson family of particles and has a spin of 0, meaning it has no angular momentum.

2. What is Isospin SU(3)?

Isospin SU(3) is a mathematical concept used in particle physics to describe the properties of subatomic particles. It is a symmetry group that explains the similarities and differences between particles that belong to the same family, such as mesons or baryons.

3. What is the significance of Isospin SU(3) in relation to Up+Down Scalar Mesons?

The concept of Isospin SU(3) is used to classify and understand the behavior of Up+Down Scalar Mesons, as well as other particles with similar properties. It allows scientists to predict the behavior of these particles and make connections between them.

4. What are Low Energies in relation to Up+Down Scalar Mesons?

In particle physics, energies are often categorized as "high" or "low" based on their magnitudes. Low energies refer to energies that are relatively small in comparison to other energies in the field. In the context of Up+Down Scalar Mesons, low energies are important because they allow scientists to study the behavior of these particles in a controlled environment.

5. How are Up+Down Scalar Mesons studied at Low Energies?

Up+Down Scalar Mesons are studied at low energies using a variety of experimental techniques, such as particle accelerators and detectors. By colliding particles at low energies, scientists can observe the interactions and properties of Up+Down Scalar Mesons and gain a better understanding of their behavior.

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