about eta meson

[owenhuang]

I am confused by eta meson and eta prime meson . I can not the difference between them .anybody can help me ? who can tell me what are they made up ?
some textbook say that the neutral eta meson is considered to be a quark combination
(uubar+ddbar-2*ssbar)/6^(1/2),but I am still not clear.

[humanino]

Hi,

it will not help to open multiple threads on the same question. Thanks :smile:

[owenhuang]

ok ,get it !

[humanino]

It will not be easy for me to reply right away. From the top of my head, the eta did not have s\bar{s} components. As for the eta', you might be happy to hear that even professional specialists are not sure that there is no glue content in it :smile:

[humanino]

From the top of my head, the eta did not have s\bar{s} components.The top of my head is not vey high this morning :smile:
This is wrong. You might want to take a look (for instance) at On the gluon content of the eta and eta' mesons (http://arxiv.org/abs/hep-ph/0703187) where fits to available data are given.

[owenhuang]

thanks !