Gaugino mass in heavy sfermion scenario

TL;DR

This paper investigates gaugino masses within the heavy sfermion scenario of supersymmetry, deriving anomaly-mediated contributions, exploring additional loop effects, and analyzing phenomenological implications for collider and cosmic ray searches.

Contribution

It provides a detailed calculation of gaugino masses including anomaly mediation and loop corrections, and studies their phenomenology in degenerate mass scenarios.

Findings

Anomaly mediated gaugino masses are derived using supergravity formalism.

Additional one-loop corrections from light matter fields and axions are calculated.

Degenerate gaugino masses significantly impact relic abundance and detection strategies.

Abstract

The heavy sfermion scenario is naturally realized when supersymmetry breaking fields are charged under some symmetry or are composite fields. There, scalar partners of standard model fermions and the gravitino are as heavy as O(10-1000) TeV while gauginos are as heavy as O(1) TeV. The scenario is not only consistent with the observed higgs mass, but also is free from cosmological problems such as the Polonyi problem and the gravitino problem. In the scenario, gauginos are primary targets of experimental searches. In this thesis, we discuss gaugino masses in the heavy sfermion scenario. First, we derive the so-called anomaly mediated gaugino mass in the superspace formalism of supergravity with a Wilsonian effective action. Then we calculate gaugino masses generated through other possible one-loop corrections by extra light matter fields and the QCD axion. Finally, we consider the case where some gauginos are degenerated in their masses with each other, because the thermal relic abundance of the lightest supersymmetric particle as well as the the strategy to search gauginos drastically change in this case. After calculating the thermal relic abundance of the lightest supersymmetric particle for the degenerated case, we discuss the phenomenology of gauginos at the Large Hadron Collider and cosmic ray experiments.