The soft supersymmetry breaking in D=5 supergravity compactified on S_1/Z_2 orbifolds

TL;DR

This paper investigates how gravity and radion mediation induce soft supersymmetry breaking terms in a five-dimensional supergravity model compactified on an orbifold, deriving finite, correlated parameters with phenomenological relevance.

Contribution

It provides explicit calculations of soft SUSY breaking terms in 5D supergravity on S_1/Z_2, showing their finiteness, non-tachyonic nature, and dependence on the gravitino mass and extra dimension size.

Findings

Soft scalar masses are non-tachyonic and finite.

Soft parameters are expressed in terms of gravitino mass and compactification scale.

Phenomenological implications of the correlated soft terms are discussed.

Abstract

We study the origin of the supersymmetry breaking induced by the mediation of gravity and the radion multiplet from the hidden to the visible brane in the context of the N=2, D=5 supergravity compactified on S_1/Z_2 orbifolds. The soft supersymmetry breaking terms for scalar masses, trilinear scalar couplings and gaugino masses are calculated to leading order in the five dimensional Newton's constant k_5^2 and the gravitino mass m_{3/2}. These are finite and non-vanishing, with the scalar soft masses be non-tachyonic, and are all expressed in terms of the gravitino mass and the length scale R of the fifth dimension. The soft supersymmetry breaking parameters are thus correlated and the phenomenological implications are discussed.