Displaced neutrino jets at the LHeC

A bstract Extending the Standard Model with right-handed neutrinos (RHNs) is well motivated by observation of neutrino oscillations. In type-I seesaw model, RHNs interact SM particles via tiny mixings active neutrinos, which makes their discovery in laboratory, and particular at collider experiments general challenging. this work we instead consider an extension model addition a leptoquark (LQ), employ non-minimal production mechanism RHN LQ decay, unsuppressed mixing. We focus on relatively light mass $$ \mathcal{O} O (10) GeV 1.0 TeV, explore prospect proposed Large Hadron electron Collider. considered range given interaction strength, long lived and, due to it stemming from also heavily boosted, resulting collimated decay products. The unique signature under investigation thus displaced fat jet. use kinematic variables separate signal background, demonstrate that ratio respect energy/number prompt tracks are useful handles identification decays RHN. show employing positron beam provides order magnitude enhancement detection signature.