MG14 - Talk detail

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Talk

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Abstract

Neutron-Antineutron oscillation can be generated by non-perturbative stringy effects. In particular, "Exotic Instantons" could generate 6 quarks effective operators (\Delta B=2), beyond the Standard Model. These effects are calculable and controllable in a large class models with intersecting D-branes models. Contrary to Explicitly R-parity breaking MSSM, and the largest part of GUT, n-\bar{n} transition does not lead to a proton destabilization in a comparable time. So, an intriguing question for phenomenology is: how fast might n-\bar{n} transitions be? We show that such a process can be very fast in comparison with other Baryon and Lepton violating transitions, such as proton decays of neutrinoless-double-beta-decays. Current best limits on n-\bar{n} are surprisingly low, and the next generation of experiments promise to enhance these of two orders in transition time! Further phenomenological implications are also discussed, in susy SM-like and susy PS-like cases.

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