Unravelling an extended quark sector through multiple Higgs production

摘要: In many new physics scenarios, the particle content of Standard Model is extended and Higgs couplings are modified, sometimes without affecting single production. We analyse two models with additional quarks. these models, we compute double production from gluon fusion exactly at leading-order, present analytical results in heavy-quark mass approximation. The experimental bounds precision electroweak measurements measured rate combine to give significant restrictions for allowed deviation prediction as well on branching ratio decay into photons. analysed eventually a similar phenomenology Model. connect this result magnitude dimension six operators contributing gluon-fusion