# Is there a blue-anti blue gluon?

1. Aug 26, 2014

### saif gaber

the only reason i am not sure about the existance of blue-anti blue gluons is because i have never seen them in any of the explanations i have read or watched and that is what confuses me.

2. Aug 26, 2014

### Staff: Mentor

Welcome to PF!

There is some discussion of gluons here:

http://en.wikipedia.org/wiki/Gluons

where they talk about the reasoning of why there's no blue anti-blue gluon

3. Aug 26, 2014

### samalkhaiat

The "colorless" blue-antiblue appears as a component in two of the 8 quarks:
$$|8_{ 3 } \rangle = \frac{ 1 }{ \sqrt{2} } ( r \bar{ r } - b \bar{ b } )$$
$$|8_{ 8 } \rangle = \frac{ 1 }{ \sqrt{6} } ( r \bar{ r } + b \bar{ b } - 2 g \bar{ g } )$$
These are the two "colorless" members of the quark octet $[8]$.

$$|1 \rangle = \frac{ 1 }{ \sqrt{3} } ( r \bar{ r } + b \bar{ b } + g \bar{ g } )$$