Sgoldstino signal at FASER: prospects in searches for supersymmetry

TL;DR

This paper explores FASER's potential to detect light sgoldstinos, particles predicted by supersymmetry, through flavor-conserving and violating interactions, highlighting FASER's ability to probe new parameter spaces beyond traditional collider experiments.

Contribution

It demonstrates FASER's capability to search for light sgoldstinos in low-energy supersymmetry models, including flavor-violating scenarios, and assesses the experimental reach of current and future runs.

Findings

FASER can test flavor-conserving sgoldstino couplings.

FASER-II significantly expands the explored parameter space.

First FASER run already probes interesting model regions.

Abstract

We investigate FASER@LHC perspectives in searches for light ($0.1-5$ GeV) sgoldstinos in models with low energy ($10-10^4$ TeV) supersymmetry breaking. We consider flavor conserving and flavor violating couplings of sgoldstinos to Standard Model fermions and find the both options to be testable at FASER. Even the first FASER run allows one to probe interesting patches in the model parameter space, while the second run, FASER-II, with significantly larger detector fiducial volume, gives a possibility to thoroughly explore a wide class of supersymmetric extensions of particle physics complementary to those probed at LHC with ATLAS and CMS detectors.