2015/03/19 by Sanjoy Biswas, Biswas, Sanjoy, Emidio Gabrielli +6
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1503.05836
25 pages, 12 figures; Conclusion Section expandend, to appear in JHEP; v5: typographical errors corrected
arxiv created 2016/09/05 · arxiv updated 2016/09/06
We study the production of a Higgs boson recoiling from a massless invisible system in e^ + e^ - collisions. This is a quite distinctive signature that can arise when the Higgs boson is produced in association with a massless dark photon, which can happen in BSM scenarios foreseeing an extra unbroken U(1) gauge group. Dark photons can indeed acquire effective couplings to the Higgs boson as occurs in models recently proposed to generate exponentially-spread Yukawa couplings. We analyze the signal and corresponding backgrounds for H→ bb, and estimate ILC and FCC-ee sensitivities in a model-independent way.