Abstract
In the present paper we discussed light scalar sgoldstino in context of low scale SUSY breaking. We analyzed electromagnetic sector of interaction of sgoldstino with SM. We also took into account the impact on this interaction of the admixture of lightest MSSM Higgs scalar in the sgoldstino state. The signal rate of rare sgoldstino decays into SM particles at CERN electron beam dump experiment NA64 for the scalar sgoldstino has been estimated. We used expected signal rate to obtain some regions of sgoldstino parameter space (sgoldstino mass and SUSY breaking scale √F).
Highlights
Supersymmetry is a promising extention of the Standard Model [1, 2]
According to experimentally observed absence of superpartners at low energies, SUSY models imply supersymmetry to be spontaneously broken at some scale
The purpose of the present work is to estimate the signal rate of sgoldstino decays expected to detect at the NA64 electron beam-dump experiment in context of present model
Summary
Supersymmetry is a promising extention of the Standard Model [1, 2]. according to experimentally observed absence of superpartners at low energies, SUSY models imply supersymmetry to be spontaneously broken at some scale. In the simplest case this fermion belongs to a chiral multiplet, dubbed goldstino supermultiplet Apart from goldstino, it contains scalar - sgoldstino and an auxiliary field acqui√ring nonzero vacuum expectation value F, which trigger spontaneous SUSY breaking. In the present work we consider the mass of sgoldstino to be light (less than 1 GeV) as phenomenologically interesting case; a high intensity beam is required to test the model via production of sgoldstino. A preliminary estimate of the search for sgoldstino at beam dump experiment SHiP for sgoldstino production and decay mechanisms can be found in Ref. The purpose of the present work is to estimate the signal rate of sgoldstino decays expected to detect at the NA64 electron beam-dump experiment in context of present model We consider the case when mostly the sgoldstino decays into electron-positron pairs as searching signature
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