CompHEP Package with Light Gravitino and Sgoldstinos

Abstract

We present a complete description of a new physical model with goldstino supermultiplet for CompHEP software package. The model contains MSSM content supplemented by three new fields: {\it goldstino} -- two component spinor, scalar {\it sgoldstino} and pseudoscalar {\it sgoldstino}. To the leading order in 1/F, where F is the parameter of supersymmetry breaking, and to zero order in MSSM gauge and Yukawa coupling constants, the interactions between the component fields of goldstino supermultiplet and MSSM fields are derived. They correspond to the most attractive for collider studies processes where only one of these {\it new} particles appears in a final state. In this case light gravitino behaves exactly as goldstino. For sgoldstinos, as they are R-even, we include in the package only sgoldstino couplings to goldstino and sgoldstino couplings to SM fields as the most interesting phenomenologically. All new coupling constants between the components of goldstino supermultiplet and MSSM fields are completely determined by the ratios of soft supersymmetry breaking parameters and F. Thus, in addition to the MSSM coupling constants there are three new parameters in the package: the scale of supersymmetry breaking, $\sqrt{F}$, and masses of scalar and pseudoscalar sgoldstinos. The CompHEP notations for the new fields and parameters are presented. The package was successfully tested and all relevant results known in literature have been reproduced with good accuracy. It may be used in order to calculate any tree-level process with one gravitino or sgoldstino on mass shell. Universality of the Lagrangian allows to apply the package in study of phenomenology of any supersymmetric extension of the Standard Model.

10 pages; the software package is available at http://theory.sinp.msu.ru/~semenov/mssm.html

References in corpus (18)

• Theories with Gauge-Mediated Supersymmetry Breaking
• CompHEP - a package for evaluation of Feynman diagrams and integration over multi-particle phase space. User's manual for version 33
• Signals of a superlight gravitino at hadron colliders when the other superparticles are heavy
• Signals of a superlight gravitino at e^+ e^- colliders when the other superparticles are heavy
• Light Sgoldstino: Precision Measurements versus Collider Searches
• Kaon Physics with Light Sgoldstinos and Parity Conservation
• Signatures of massive sgoldstinos at e+e- colliders
• Signatures of massive sgoldstinos at hadron colliders
• New Astrophysical Constraints on the Mass of the Superlight Gravitino
• New Collider Bound on Light Gravitino Mass
• Astrophysical Limits on Gravitino Mass
• Limits on Gravitino Production and New Processes with Large Missing Transverse Energy in p-pbar Collisions at sqrt(s)=1.8 TeV
• Sgoldstino events in top decays at LHC
• The Role of Scalar and Pseudoscalar Fields in Determining Nucleosynthesis Bounds on the Scale of Supersymmetry Breaking
• Vector Leptoquark Pair Production in $e^{+}{e}^{-}$ Annihilation
• Search for the sgoldstino at sqrt(s) from 189 to 202 GeV
• Single leptoquark production associated with hard photon emission in ep collisions at high energies
• Report of the Beyond the MSSM Subgroup for the Tevatron Run II SUSY/Higgs Workshop

Cited by in corpus (10)

• A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• On sgoldstino interpretation of the diphoton excess
• Two universal extra dimensions and spinless photons at the ILC
• On sgoldstino interpretation of HyperCP events
• SUSY in the sky or a keV signature of sub-GeV gravitino dark matter
• More about sgoldstino interpretation of HyperCP events
• Distinguishing spins in decay chains with photons at the Large Hadron Collider
• Flavor violating processes with sgoldstino pair production
• Gravitational waves from first-order electroweak phase transition in a model with light sgoldstinos