Speaker
Description
Supersymmetry is a promicing extention of the Standard Model. Since no superpartners have been found, it is tempting to explore the possibility that SUSY can manifest itself at low energy through a hidden sector which is responsible for the supersymmetry breaking. It is interesting that possible interactions of such a hidden sector with SM particles can be observed at relatively low energies.
In this work, we consider Minimal Supersymmetric Standard Model (MSSM) augmented with a goldstino chiral supermultiplet Φ = φ + sqrt{2}θψ + {θ}^{2} , where 𝜑 is sgoldstino field, 𝜓 is sgoldsino’s superpartner, goldstino, and 𝙵 is an auxiliary field. The vev of 𝙵, < 𝙵 >, is responsible for supersymmetry breaking. The considered values of < 𝙵 > are larger then several TeV. The sgoldstino field can be represented as 𝜑 = S + iP, where S and P are the scalar and pseudoscalar component, respectively. It is phenomenologically acceptable to have sgoldstinos as light as GeV scale. At the same time interactions of sgoldstino with the SM fields are suppressed by M/F, where M is a combination of soft supersymmetry breaking parameters.
If sgoldstinos masses are of order of several tens or hundreds MeV, the search for them is possible at the recently proposed Troitsk Meson Factory experimental facility (TiMoFey) at the Institute for Nuclear Research of Russian Academy of Sciences (Russia). It assumes use of a high intensity proton beam energy of 423 MeV and 1300 MeV at the first and second stages of operation, respectively. Collisions of protons may produce light hypothetical particles such as sgoldstinos.
Since the considered energies are sufficiently low, chiral perturbation theory (ChPT) was used. The effective interaction lagrangian for pseudoscalar sgoldstino interaction with mesons and nucleons was constructed, and cross-section of pseudoscalar sgoldstino production in proton collisions was obtained.
