CP violation: why not in K*, B* vector mesons?

In summary, experimentalists have measured CP violation in neutral K and B mesons, but there are currently only two systems where these measurements are possible. Neutral D mesons are predicted to show a small effect that may be unmeasurable for a long time. It is not possible to test CP violation in spin 1 mesons, such as K* and B*, because the K* decays strongly and the B* decays electromagnetically, and CP violation is a phenomenon that occurs in weak decays. Additionally, it is not possible to observe particle-antiparticle mixing for the neutral K* and B* as it is a second-order weak effect and the mesons do not last long enough to observe it.
  • #1
franoisbelfor
42
0
Experimentalists have measured CP violation in neutral K and B mesons.
Everybody is unhappy that so far there are only 2 systems so
for which these measurements are possible.
(Neutral D mesons are predicted to show such a small effect that it
is probably unmeasurable for a long time.)
All these are spin 0 mesons.

But why is it not possible to test CP violation also in spin 1 mesons,
such as K* and B*? Is there a fundamental reason or is it simply that
experiments are too difficult?

François
 
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  • #2
The K* decays strongly and the B* decays electromagnetically, and CP violation is a phenomenon that occurs in weak decays.
 
  • #3
Vanadium 50 said:
The K* decays strongly and the B* decays electromagnetically, and CP violation is a phenomenon that occurs in weak decays.

Ah, thanks for the clarification. Could it then at least be possible to observe particle-antiparticle mixing, for the neutral K* and B*? Or is that also only visible in weak decays?

François
 
  • #4
I'm afraid not.

Mixing is second-order weak. Neither the K* nor B* last long enough to observe this, by many orders of magnitude.
 

Related to CP violation: why not in K*, B* vector mesons?

1. What is CP violation in physics?

CP violation is a phenomenon in particle physics where the laws of physics do not behave the same under the combined operations of charge conjugation (C) and parity (P) transformations. This means that certain processes involving particles and antiparticles do not occur at the same rate, violating the principle of CP symmetry.

2. Why is CP violation important?

CP violation is important because it helps explain why the universe is made up of mostly matter and very little antimatter. According to the Big Bang theory, equal amounts of matter and antimatter should have been created in the early universe, but today we only see matter. CP violation is one of the key factors that could have led to this imbalance.

3. What is K* and B* vector mesons?

K* and B* vector mesons are particles made up of a quark and an antiquark, specifically a strange quark and an up or down quark. They are part of the meson family of particles and are important in studying CP violation due to their short lifetimes and ability to decay into different particles.

4. How is CP violation studied in K* and B* vector mesons?

CP violation in K* and B* vector mesons is studied through experiments that measure the difference in decay rates between particles and antiparticles. This is known as CP asymmetry. By studying the asymmetry, scientists can determine if CP violation is occurring and how much of an imbalance there is between particles and antiparticles.

5. Why is CP violation not observed in K* and B* vector mesons?

CP violation is not observed in K* and B* vector mesons because their decay rates are too small to detect any significant asymmetry. The Standard Model of particle physics predicts a very small amount of CP violation in these particles, making it difficult to measure. However, scientists continue to study these particles in hopes of finding new sources of CP violation that could help explain the matter-antimatter asymmetry in the universe.

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