Mesons masses difference

In summary, the conversation discusses the application of group theory to QCD and the resulting 9 pseudoscalar mesons and 9 vector mesons when using the lightest 3 quarks in the ##l=0## state. The difference in masses between the two classes is attributed to a spin-spin interaction. However, the conversation raises a question about the significantly higher mass of the singlet in each case compared to the mesons in the octet. The conversation also delves into the topic of scalar mesons, specifically the reason for the significant difference in masses between eta prime and eta mesons. The conversation ends with a request for the wavefunction of the singlet particle and a comparison to the wavefunction of a sing
  • #1
299
26
Hello! I am reading some group theory applied to QCD and they show how by using the lightest 3 quarks in the ##l=0## state we get 9 pseudoscalar mesons and 9 vector mesons. The difference in masses between the 2 classes is explained by the existence of a spin-spin interaction, which seems like a reasonable argument. However they don't say anything about the fact that the mass of the singlet in each case (the 9 mesons are grouped in an octet and a singlet) is significantly higher than the masses of the mesons in the octet. What is the reason for that? Thank you!
 
Physics news on Phys.org
  • #2
How does this connect to the title? (Title has now been changed, removing confusion)
 
Last edited:
  • #3
In case of scalar mesons: what is the reason eta prime and eta mesons are at much different masses, rather than close?
 
  • #4
Malamala said:
mass of the singlet in each case...is significantly higher than the masses of the mesons in the octet

Which particle do you think is the singlet? Why? Please write down the wavefunction of the particle you think is the singlet and also the wavefunction of a singlet.
 

Suggested for: Mesons masses difference

Replies
7
Views
2K
Replies
2
Views
1K
Replies
7
Views
2K
Replies
26
Views
684
Replies
4
Views
901
Replies
31
Views
3K
Replies
2
Views
2K
Back
Top