| 9 | | The model is based on MSSM, but adding a dark sector. The dark sector, ''U(1)D'', is broken, giving rise to light dark photons (''γD'') that weakly couple to the SM particles via a small kinetic mixing with photons. The lightest neutralino ''n1'' in MSSM is no longer stable and can decay via processes such as ''n1 → nD + γD'', where ''nD'' is a light dark neutralino (fermion). In this model, the ''γD'' is mediated by very weak interactions with the SM, and can decay to muon pairs promptly or non-promptly. |
| | 9 | The model is based on MSSM from the model database, but adding a dark sector, ''U(1)D''. The dark sector is broken, giving rise to light dark photon, ''ad'', that weakly couples to the SM particles via a small kinetic mixing with photons. The lightest neutralino in MSSM, ''n1'', is no longer stable and can decay via processes such as ''n1 → nd + ad'', where ''nd'' is a light dark neutralino. In this model, ''ad'' is mediated by very weak interactions with the SM, and can decay to muon pairs. |
| 15 | | MSSMD implementation: [http://feynrules.irmp.ucl.ac.be/attachment/wiki/MSSMD/MSSMD.fr] |
| | 15 | MSSMD implementation: [http://feynrules.irmp.ucl.ac.be/attachment/wiki/MSSMD/MSSMD.fr]; |
| | 16 | Main changes compared to MSSM .fr file are |
| | 17 | {{{ |
| | 18 | Line 30-31: U1D gauge group |
| | 19 | Line 41-43: New Physics (NP) interaction order |
| | 20 | Line 63: Superfield related to the U1D gauge group |
| | 21 | Line 93-95: Physics field for the dark photon, “ad” |
| | 22 | Line 106-107: Gaugino for the new U1D gauge boson |
| | 23 | Line 136-138: Physics field for dark neutralino, “nd" |
| | 24 | Line 348-349: U1D gauge group coupling constant, “gd" |
| | 25 | Line 567-568: Vertice for “n1 > ad nd” |
| | 26 | Line 569-570: Vertice for “ad > mu+ mu-” |
| | 27 | Line 573: Added vertices to the Lagrangian |
| | 28 | }}} |
| | 29 | |
