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Is there a blue-anti blue gluon?

  1. Aug 26, 2014 #1
    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. jcsd
  3. Aug 26, 2014 #2


    Staff: Mentor

    Welcome to PF!

    There is some discussion of gluons here:


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

  4. Aug 26, 2014 #3


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    Science Advisor

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

    Are asking about the color singlet? which is
    [tex]|1 \rangle = \frac{ 1 }{ \sqrt{3} } ( r \bar{ r } + b \bar{ b } + g \bar{ g } ) [/tex]

    If this singlet state existed, it would be as common as the photon! It would also add a big contribution to the force of gravity!! So there are both theoretical and experimental reasons to rule it out.

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