t]/a from leptoquark exchange the constraints are weaker .
t] mediated by leptoquark exchange the conclusion based on dimensional estimates of the electron EDM and the electric and chromoelectric quark dipole moments is that [D.
LR]-type interaction can arise at the tree level in models containing a new charged gauge boson with right-handed couplings to the quarks (as in left-right symmetric models), in the SM model if it is extended to contain new heavy "exotic" quarks which have right-handed couplings to the W and which mix with the known quarks, and in models with leptoquarks.
One possibility is that a positron may merge briefly with a quark, creating a particle that theorists call a leptoquark
The model also predicts the existence of particles called leptoquarks, which, in principle, could be detected in a proton-electron collider nearing completion in Germany.
If leptoquarks are light enough, physicists should be able to detect them when experiments begin next year at the Hadron-Electron-Ring Accelerator in Hamburg, Germany.
The discovery of leptoquarks would be evidence for grand unification as compelling as proton decay," Frampton says.