Long-lived Light Scalars at the LHC

摘要

In the minimal left–right realization of TeV scale seesaw for neutrinomasses, there is a phenomenologically allowed range of parameters whereone of the neutral scalar particles from the right-handed symmetry breakingsector could have a mass at the GeV scale. We discuss the constraints onthis particle from low-energy flavor observables, and find that such a lightparticle is necessarily long-lived, and can be searched for at the LHC viadisplaced signals of a collimated photon jet. This decay mode provides anew test of TeV scale left–right seesaw model since this is in sharp contrastwith any generic beyond the Standard Model light scalar, which woulddecay to leptons and jets as well.