Quark Spins: +2/3 and -1/3 Charge

Thread starter taylordnz
Start date Jun 1, 2004
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Charge Quark

In summary, quark spins refer to the intrinsic angular momentum of quarks and are related to their electric charge. We know that quarks have spins of +1/2 and -1/2 through experiments such as deep inelastic scattering and electron-positron annihilation. In particle physics, quark spins are significant in determining the properties and interactions of composite particles. Quarks are considered fundamental particles and cannot change their spin or charge, but can interact with other particles. The Standard Model predicts the existence of six types of quark spins, including top and bottom quarks, but not all of them are observed in stable matter.

Jun 1, 2004

taylordnz

what are the spin of quarks with +2/3 and -1/3 charge?

need info urgently

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Jun 1, 2004

mathman

Science Advisor

http://pdg.lbl.gov/

Above website has lots of information about fundamental particles including quarks. Spin is 1/2.

1. What are quark spins and how do they relate to charge?

Quark spins refer to the intrinsic angular momentum of a quark, which is a subatomic particle that makes up protons and neutrons. The spin of a quark can have a value of either +1/2 or -1/2. This spin is related to the quark's electric charge, as quarks with a spin of +1/2 have a charge of +2/3 and those with a spin of -1/2 have a charge of -1/3.

2. How do we know that quarks have spins of +1/2 and -1/2?

Quark spins were originally theorized by physicists in the 1960s to explain the behavior of subatomic particles. Later, experiments such as deep inelastic scattering and electron-positron annihilation confirmed the existence and properties of quarks, including their spins.

3. What is the significance of quark spins in particle physics?

Quark spins play a crucial role in the Standard Model of particle physics, which describes the fundamental particles and forces in the universe. The spins of quarks are important in determining the properties and interactions of composite particles, such as protons and neutrons, which are made up of three quarks each.

4. Can quarks change their spin or charge?

No, quarks are considered to be fundamental particles, meaning they cannot be broken down into smaller components. As such, they cannot change their spin or charge. However, they can interact with other particles and exchange energy, which can result in the creation or annihilation of quark-antiquark pairs.

5. Are there any other types of quark spins besides +1/2 and -1/2?

The Standard Model predicts the existence of six types of quark spins, with different combinations of spin and charge. These include the top quark, bottom quark, charm quark, and strange quark, which all have a spin of +1/2, and the top antiquark and bottom antiquark, which have a spin of -1/2. However, the top quark and antiquark are not observed in stable matter and can only be created in high-energy collisions.