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One of the early proposals for the Tevatron asymmetry on $t \bar t$ was a "fundamental diquark" with a charge (and hypercharge) +4/3, either in a triplet or a sextet colour. I am interested on the current status of this proposal:

Generically, has some particular model of been favoured in ulterior research?

For starters, you can see the short report in JHEP 1109:097,2011, at the end of section 2, points 5 and 6. I only become aware of the survival of this hypothesis after seeing http://arxiv.org/abs/1111.0477 last week.

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Can you link to some published account of this proposal? –  user566 Nov 13 '11 at 15:42
    
@Moshe done. But I am interested on any account, either unpublished (conferences or arxiv), published or rumoured. –  user135 Nov 13 '11 at 16:33
    
I have confirmed with some authors that the field uses the normalization Q=T3+Y for the hypercharge. So hypercharge=4/3 is charge=4/3 if T=0 –  user135 Nov 14 '11 at 11:03

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