Gaugino mass without singlets

Abstract

In models with dynamical supersymmetry breaking in the hidden sector, the gaugino masses in the observable sector have been believed to be extremely suppressed (below 1 keV), unless there is a gauge singlet in the hidden sector with specific couplings to the observable sector gauge multiplets. We point out that there is a pure supergravity contribution to gaugino masses at the quantum level arising from the superconformal anomaly. Our results are valid to all orders in perturbation theory and are related to the 'exact' beta functions for soft terms. There is also an anomaly contribution to the A terms proportional to the beta function of the corresponding Yukawa coupling. The gaugino masses are proportional to the corresponding gauge beta functions, and so do not satisfy the usual GUT relations.

On the one-loop Kähler potential in five-dimensional brane-world supergravity

“…Supersymmetry breaking is then transmitted to the observable sector at one-loop level by (flavor-blind) gravitational interactions. One mechanism that can operate here is anomaly mediation [1,2]. Besides, there is always a contribution from integrating out the Kaluza-Klein (KK) tower of the supergravity multiplet.…”

Purley Four-dimensional Viable Anomaly Mediation

“…Λ ≫ V The first limit, Λ ≫ V , is achieved by introducing an additional flavor, Q 7 , Q 8 . No corresponding anti-flavor is necessary as the additional flavor is not charged under any gauge group except the strong Sp (2). The extra flavor is massive.…”

“…Note that the SU (2) theory is conformal at one-loop, so its coupling does not contribute tom 2 (1,2,−2) . The final expression for the D-term in this case is then…”

“…There might be a concern that additional contributions to the soft masses of the MSSM fields might arise from integrating out other heavy fields charged under the U (1). However, because of the charges of the Q's under Sp (2) and SU (4) × SU (2) × U (1) ⊂ SU (6), it is impossible to construct a non Planck-suppressed invariant with these fields that could couple to the MSSM. As long as the dynamically generated scale is much less than the Planck scale, these contributions are small.…”

“…Anomaly-mediated supersymmetry breaking [1,2] represents an attractive solution to this problem. In anomaly mediation, the breaking of scale invariance mediates supersymmetry breaking between the visible and the hidden sectors.…”