Intersecting Branes, SUSY Breaking and the 2TeV Excess at the LHC

TL;DR

This paper explores intersecting D-brane models in string theory that support left-right symmetric extensions of the Standard Model, aiming to explain the 2TeV excesses observed at the LHC and determining the supersymmetry breaking scale through gauge coupling unification.

Contribution

It identifies a minimal supersymmetry breaking scale around 19TeV in intersecting brane models consistent with LHC excesses and gauge coupling unification constraints.

Findings

Supersymmetry breaking scale ~19TeV

SU(2)_R gauge coupling between 0.48 and 0.6

Threshold corrections may lower the supersymmetry scale

Abstract

Intersecting D-brane models in string theory can naturally support the gauge and matter content of left-right symmetric extensions of the Standard Model with gauge symmetry SU(3)_c x SU(2)_L x SU(2)_R x U(1)_{B-L}. Considering such models as candidates for explaining the 2TeV excesses seen in Run-1 by both ATLAS and CMS, the minimal possible scale of supersymmetry breaking is determined by the requirement of precise one-loop gauge coupling unification. For the vector-like, bifundamental and (anti-)symmetric Higgs content of such brane configurations, this comes out fairly universally at around 19TeV. For the SU(2)_R gauge coupling one finds values 0.48<g_R(M_R)<0.6. Threshold corrections can potentially lower the scale of supersymmetry breaking.