sci.physics.research

I am fascinated with the old Marcus-Sagnotti "Group Theory from
Quarks at the Ends of Strings" (SPIRES /spires/find/hep/www?j=PHLTA,B188,58
). Does it imply really that the SO(32) string has 10 different quarks
at the terminations. And, should an antiquark count as a different
quark in this list?

Is anybody in fluent in this topic? I would ask in sps but it
seems to be dead.

The result is intriguing because the QCD string, if we think about it,
also happens to have, modulo color, 10 different quarks at the
terminations: u,c,d,s,b and its antiquarks. It happens because the
mass of the top quark is too heavy, and then it disintegrates before
binding into mesons (or diquarks), so there is not such a thing as a
top-mesonic Reggee, trajectory, nor a top-terminated QCD string.

Of course one could point out that if the QCD string is to be
considered as a SO(32) Type I string, then we should find some hint of
supersymmetry. Perhaps my hep-ph/0512065 has some role to play here,
but I already touched this topic last month in other post.

Alejandro