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

Abstract

We discuss an alternative for Baryon-violating six quarks transitions, in the contest of low scale string theory. In particular, with $M_S=10÷10^3\mathrm{TeV}$, 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. This would strongly motivate researches of direct channels in proton-proton colliders. In fact, our model can be directly tested in a experimentally challenging $100÷1000\mathrm{TeV}$ proton-proton collider, searching for our desired color-triplet states and an evidence for exotic instantons resonances, in addition to stringy Regge resonances, anomalous $Z^{\prime }$-bosons and gauged megaxion. In particular, our scenario can be related to the $750\mathrm{GeV}$ diphoton hint identifying it with the gauged megaxion dual to the $B$-field. On the other hand, this scenario is compatible with TeV-ish color triplets visible at LHC and with $1÷10\mathrm{TeV}$- string scale, {\it i.e} stringy resonances at LHC.

Version accepted by Mod.Phys.Lett.A

References in corpus (25)

• Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
• Neutrino Majorana Masses from String Theory Instanton Effects
• Anomalies, Anomalous U(1)'s and generalized Chern-Simons terms
• Instanton Induced Neutrino Majorana Masses in CFT Orientifolds with MSSM-like spectra
• Non-perturbative Yukawa Couplings from String Instantons
• The LHC String Hunter's Companion
• Non-perturbative and Flux superpotentials for Type I strings on the Z_3 orbifold
• Minimal Anomalous U(1)' Extension of the MSSM
• Predicting charged lepton flavor violation from 3-3-1 gauge symmetry
• Radiative neutrino mass in 331 scheme
• Neutrino Masses and Mixings from String Theory Instantons
• Small neutrino masses and gauge coupling unification
• Neutron Majorana mass from exotic instantons
• Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
• 'Exotic vector-like pair' of color-triplet scalars
• Exotic see-saw mechanism for neutrinos and leptogenesis in a Pati-Salam model
• Un-oriented Quiver Theories for Majorana Neutrons
• String Resonances at Hadron Colliders
• Z' boson detection in the Minimal Quiver Standard Model
• External stability for Spherically Symmetric Solutions in Lorentz Breaking Massive Gravity
• Nonlocal quantum field theory without acausality and nonunitarity at quantum level: is SUSY the key?
• Mass-deformed Brane Tilings
• Direct generation of a Majorana mass for the Neutron from Exotic Instantons
• Unitarization and Causalization of Non-local quantum field theories by Classicalization
• Auto-Concealment of Supersymmetry in Extra Dimensions

Cited by in corpus (6)

• Dark Matter and Inflation in $R+\zeta R^2$ Supergravity
• Dark Matter from Starobinsky Supergravity
• More about the Instanton/Soliton/Kink correspondence
• Super-light baryphotons, Weak Gravity Conjecture and Exotic instantons in Neutron-Antineutron transitions
• Weak Gravity Conjecture as a Razor Criterium for Exotic D-brane instantons
• Testing B-violating signatures from Exotic Instantons in future colliders