Sgoldstino signature in hh, W+W− and ZZ spectra at the LHC

Abstract

In a supersymmetric extension of the Standard Model of particle physics (SM) with low scale of supersymmetry breaking, sgoldstino of (sub)TeV mass can be observed at the Large Hadron Collider (LHC) as a peak in diboson mass spectra. Moreover, as a singlet with respect to the SM gauge group, scalar sgoldstino can mix with the SM-like Higgs boson and interfere in all neutral channels providing with the promising signatures of new physics if superpartners are heavy. Sgoldstino couplings to the SM particles are determined by the pattern of soft supersymmetry breaking parameters. Here we concentrate on the cases with a noticeable sgoldstino contribution to di-Higgs channel. Having found a phenomenologically viable region in the model parameter space where scalar sgoldstino, produced at the LHC in gluon fusion, decays into a pair of the lightest Higgs boson we give predictions for corresponding cross section. Using the results of the LHC searches for scalar resonances we place bounds on the supersymmetry breaking scale √ F in this region of parameter space. Remarkably, in this region sgoldstino may also be observed in W + W − and ZZ channels, yielding independent signatures, since their signal strengths are related to that of di-Higgs channel.

Gravitational waves from first-order electroweak phase transition in a model with light sgoldstinos

“…are the Higgs doublets. The above expressions agree with the potential found in [24] if one puts all the 'δ'-couplings entering (2.5) to zero. Note that in the Lagrangian each power of sgoldstino field comes with the power of 1/F , therefore for √ F to be considerably larger than sgoldstino masses and soft SUSY breaking parameters the higher order interaction terms are parametrically suppressed; consequently, in (3.1)-(3.5) we neglect all the terms suppressed by 1/F 3 and stronger.…”

“…Prospects of such searches and bounds from existing experimental results have been discussed in several studies previously, see e.g. [18,24,74,84]. In general, sgoldstino can reveal themselves either through mixing with the Higgs boson or via triple and quartic interactions involving the Higgs boson and sgoldstino.…”

“…In particular, presence of relatively light sgoldstinos can noticeably affect the Higgs sector of the model, see e.g. [22][23][24].…”

The Light Sgoldstino Phenomenology: Explanations for the Muon $(g-2)$ Deviation and KOTO Anomaly

“…In particular, in the low energy supersymmetry breaking, i.e. N = 1 supersymmetry is broken at low energy around TeV scale [3][4][5][6][7][8][9][10], sgoldstino is light so that it can be probed in low energy experiments. Therefore, we would like to explore the sgoldstino phenomenology.…”

The light sgoldstino phenomenology: explanations for the muon (g − 2) deviation and KOTO anomaly

“…In particular, in the low energy supersymmetry breaking, i.e. N = 1 supersymmetry is broken at low energy around TeV scale [3][4][5][6][7][8][9][10], sgoldstino is so light that it can be probed in low energy experiments. Therefore, we would like to explore the sgoldstino phenomenology.…”