Direct searches of Type-III seesaw triplet fermions at high energy e+e- collider

• Published in: The European physical journal. C, Particles and fields Vol. 78; no. 1; pp. 1 - 16
• Main Authors: Goswami, Deepanjali, Poulose, P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2018; Springer Nature B.V
• Subjects: Astronomy; Astrophysics and Cosmology; Asymmetry; Electron-positron accelerators; Elementary Particles; Energy; Fermions; Hadrons; Heavy Ions; Kinematics; Large Hadron Collider; Luminosity; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Pair production; Parameter identification; Phenomenology; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-017-5478-1

The signatures of heavy fermionic isotriplets ( Σ ) are probed through their direct production and subsequent decay at high energy electron–positron colliders. Unlike the case of LHC, the production process has strong dependence on the mixing of Σ with electron ( V e ), making the leptonic collider unique to fingerprint the presence of such mixing. We establish that pair production considered at s = 2  TeV can be employed to study both the cases of V e = 0 and of V e ≠ 0 with ∼ 100  fb - 1 luminosity, while the single production can probe the latter case with a few inverse femto barn luminosity at s = 1 TeV. Exploring the mass reach, both the single and pair productions are capable of probing Σ of mass close to the kinematic limits through selected channels. Investigating simultaneous limits on the M Σ - V e parameter space, we identify suitable final states and their 3 σ reach on V e and M Σ at 300 (100) fb - 1 luminosity in the case of pair (single) Σ production.