What changes under charge conjugation

In summary, the quantum numbers that change under the charge conjugation operation are electric charge, isospin, z-component of isospin, and hypercharge. Spin and parity do not change under this operation. The magnitude of isospin remains the same, but its C dependence is governed by the connection between charge and z-component of isospin. Hypercharge changes sign, and for bosons, parity remains unchanged. The antiproton does not have a parity by itself, but has a negative relative parity with the proton. This is predicted by the Dirac equation and has been measured in experiments.
  • #1
FredMadison
47
0
Hi!

Which quantum numbers change under the charge conjugation operation?

Electric charge - yes
Spin - no
Isospin - ?
z-component of isospin - ?
Hypercharge - ?
Parity - ?
 
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  • #2
Magnitude of Ispin is the same.
I_z is tricky. It's C dependence is governed by the connection betwen charge and I_z.
Hypercharge changes sign.
Parity for bosons doesn't change.
The relative parity for p and pbar is negative so the p-pbar S state has odd parity.
 
  • #3
I'm specifically looking for the parity of the antiproton. Can't find it anywhere! Anyone knows?
 
  • #4
The antiproton does not have a parity by itself. There is a relative parity of the antiproton and the proton. That is, the proton-antiproton state has negative intrinsic parity. This is predicted by the Dirac equation, and has been measured by the angular asymmetry in the process p+pbar--> pi+pi. The combination also is negative under charge conjugation. These properties were listed at one time in the PDG data summary, but have been left out recently. They mave thought it was too obvious, which it isn't.
 
  • #5
Aha, I see. Thanks a lot clem!
 

1. What is charge conjugation?

Charge conjugation is an operation in particle physics where the electric charge of a particle is reversed. This means that a positively charged particle becomes negatively charged, and vice versa.

2. How does charge conjugation affect particles?

Under charge conjugation, particles are transformed into their antiparticles. This means that the properties of a particle, such as mass and spin, remain the same, but its electric charge is reversed.

3. What are the practical applications of charge conjugation?

Charge conjugation is an important concept in particle physics and is used to describe the interactions between particles. It is also used in the study of antimatter and the creation of new particles in particle accelerators.

4. Are there any exceptions to charge conjugation?

Yes, there are a few exceptions to charge conjugation. For example, some particles, such as neutrinos, do not have a defined electric charge, so charge conjugation does not apply to them.

5. How is charge conjugation related to other symmetries in physics?

Charge conjugation is one of several discrete symmetries in physics, along with parity and time reversal. These symmetries play an important role in understanding the fundamental forces and particles in the universe.

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