The Mass Spectra, Hierarchy and Cosmology of B-L MSSM Heterotic Compactifications

TL;DR

This paper investigates the mass spectra, hierarchy, and cosmological implications of B-L MSSM heterotic compactifications, extending previous analyses by numerically solving RGEs and exploring parameter space for realistic vacua.

Contribution

It provides a comprehensive numerical analysis of B-L MSSM compactifications, including detailed RGE calculations and phenomenological implications, expanding on prior semi-analytic work.

Findings

B-L gauge symmetry is radiatively broken with proper hierarchy.

Mass spectra are consistent with experimental bounds.

Identifies phenomenological signatures like lepton/baryon violation.

Abstract

The matter spectrum of the MSSM, including three right-handed neutrino supermultiplets and one pair of Higgs-Higgs conjugate superfields, can be obtained by compactifying the E_{8} x E_{8} heterotic string and M-theory on Calabi-Yau manifolds with specific SU(4) vector bundles. These theories have the standard model gauge group augmented by an additional gauged U(1)_{B-L}. Their minimal content requires that the B-L gauge symmetry be spontaneously broken by a vacuum expectation value of at least one right-handed sneutrino. In previous papers, we presented the results of a quasi-analytic renormalization group analysis showing that B-L gauge symmetry is indeed radiatively broken with an appropriate B-L/electroweak hierarchy. In this paper, we extend these results by 1) enlarging the initial parameter space and 2) explicitly calculating all renormalization group equations numerically, without approximation. The regions of the initial parameter space leading to realistic vacua are presented and the B-L/electroweak hierarchy computed over these regimes. At representative points, the mass spectrum for all sparticles and Higgs fields is calculated and shown to be consistent with present experimental bounds. Some fundamental phenomenological signatures of a non-zero right-handed sneutrino expectation value are discussed, particularly the cosmology and proton lifetime arising from induced lepton and baryon number violating interactions.