Complete Gauge Threshold Corrections for Intersecting Fractional D6-Branes: The Z6 and Z6' Standard Models

TL;DR

This paper calculates detailed one-loop gauge coupling corrections for fractional D6-branes in specific string compactifications, revealing a rich landscape of models with varied gauge properties and potential supersymmetry breaking mechanisms.

Contribution

It provides a comprehensive computation of gauge threshold corrections including all gauge factors and Wilson line effects for Z6 and Z6' models, and classifies the resulting Standard Model-like configurations.

Findings

Out of 768 D6-brane configurations, only 16 have unique massless spectra.

Ten distinct gauge coupling values are identified at one-loop.

Gauge threshold corrections increase model diversity to 196 nonequivalent configurations.

Abstract

We perform a complete analysis of one-loop threshold corrections to the gauge couplings of fractional D6-branes. This includes besides SU(N) also symplectic, orthogonal and massless Abelian gauge factors and the full computation of contributions from discrete and continuous Wilson lines and brane displacements. Two classes of globally consistent supersymmetric compactifications with Standard Model spectra on T6/Z6 and T6/Z6' are presented in detail with the latter exhibiting the potential of supersymmetry breaking via a hidden sector gaugino condensate. The T6/Z6' Standard Models are completely classified, and it turns out that out of 768 distinct D6-brane configurations only 16 different sets of massless spectra and ten distinct values of gauge couplings at one-loop arise. The gauge threshold corrections enhance the diversity to 196 nonequivalent models.