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The baryon is a-
1. π - meson
2. K - meson
3. λ - meson
4. μ - meson

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Correct Answer - Option 2 : K - meson

Concept:

Quark: A quark is a type of elementary particle and a fundamental constituent of matter.

Composite particles:  

  • Subatomic particles are made of more than one quark.
  • Simple particles like protons are actually composites of multiple quarks.

Basically two types of composite particle: Leptons and hadrons.

Laptons: These are the particle which does not affect by the strong force

Hadrons: 

  • A hadron is any particle that is made from quarks, anti-quarks and gluons.
  • These are not elementary particles. They are made up of further elementary particles namely quarks.

Hadrons are again classified into two categories: Meson and baryon. 

Difference b/w Meson and Baryon:

Meson Baryon
These are the hadron particles that are made up of quark and anti-quark pairs. Hadron particles which are made up of three quark namely quarks, anti-quarks and gluons.
Examples of mesons are the p, h, r and w mesons. Examples of baryons are protons and neutrons.
These can have a spin of +1, 0 and -1. These can have a spin of +3/2, +1/2, -1/2, -3/2 i.e.
integer multiple of spin quant quantum number: Boson Boson particle. These are also called  Fermions.

 

Explanation:

π -meson: These are also known as pions which are the lightest of all meson.

K-meson:

  • These are also known as kaon. 
  • It has zero electric charges, and its mass is about one-half the mass of the proton. 
  • It is unstable and, once formed, rapidly decays. 

μ- meson: These are also called muon which is an elementary particle with a negative charge and a half-life of 2 microseconds

From the above discussion, we can conclude that baryon is similar to K meson. 

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