Universal Soft Terms in the MSSM on D-branes

TL;DR

This paper demonstrates that universal supersymmetry-breaking soft terms can be realized in MSSM models derived from Type II string theory with intersecting/magnetized D-branes, including specific boundary conditions and parameter regions.

Contribution

It shows how universal soft terms emerge in D-brane MSSM constructions, including dilaton-dominated scenarios and boundary conditions akin to heterotic models.

Findings

Universal scalar mass and trilinear coupling fixed as m_0=(1/2)m_{3/2} and A_0 = - m_{1/2}

Models can produce soft terms with large m_0, corresponding to Focus Point regions

Dilaton and no-scale boundary conditions are realizable in this framework

Abstract

In Type II string vacua constructed from intersecting/magnetized D-branes, the supersymmetry-breaking soft terms are genericaly non-universal. It is shown that universal supersymmetry-breaking soft terms may arise in a realistic MSSM constructed from intersecting/magnetized D-branes in Type II string theory. For the case of dilaton-dominated supersymmetry-breaking, it is shown that the universal scalar mass and trilinear coupling are fixed such that $m_0=(1/2)m_{3/2}$ and $A_0 = - m_{1/2}$. In addition, soft terms where the universal scalar mass $m_0$ is much larger than the universal gaugino mass $m_{1/2}$ may be easily obtained within the model, corresponding to the Focus Point (FP)/Hyperbolic Branch (HB) regions of the mSUGRA/CMSSM parameter space. Finally, it is shown that the special dilaton and no-scale strict moduli boundary conditions, which are well-known in heterotic string constructions, may also be obtained.