More about Neutron Majorana mass from Exotic Instantons: an alternative mechanism in Low-Scale String theory

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We discuss an alternative for Baryon-violating six quarks transitions, in the contest of low scale string theory.

• In particular, with $M_{S}=10\div 10^{3}\rm TeV$, such a transition can be mediated by two color-triplets,through a quartic coupling with down-quarks,generated by exotic instantons, in a calculable and controllable way.
• We show how FCNCs limits on color-triplet massare well compatible with $n-\bar{n}$ oscillation ones.
• If a $n-\bar{n}$ transition were found, this would be an indirect hint for our model.