Gauged Baryon and Lepton Number in MSSM_4 Brane Worlds

Abstract

A recent D-brane model designed to accommodate a phenomenologically acceptable fourth generation of chiral fermions was noted to produce an unexpected additional unbroken nonanomalous U(1) gauge group at the string scale. We show that the corresponding charges acting on MSSM fields count baryon and lepton numbers. If broken spontaneously at lower scales, these U(1)_B and U(1)_L symmetries provide potential avenues for preserving baryogenesis while nonetheless explaining the suppression of proton decay (without the need for R parity), as well as the smallness of right-handed neutrino Majorana masses compared to the string scale.

21 pages. Version accepted for publication in Phys. Rev. D

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Cited by in corpus (8)

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• The $\mu \nu$SSM with an extra U(1)
• From Type II string theory towards BSM/dark sector physics
• Proton Stability and Dark Matter in a Realistic String MSSM
• Leptophobic Z' in Heterotic-String Derived Models
• Four-Lepton Resonance at the Large Hadron Collider
• Baryon number of the Universe as a result of extra space dynamics