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Towards a new paradigm for quark-lepton unification

Authors :: Caleb Smith
Vernay, Emmanuelle
Laboratoire de Physique Subatomique et de Cosmologie (LPSC)
Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS)
Source :: Journal of High Energy Physics, Vol 2017, Iss 5, Pp 1-36 (2017), Journal of High Energy Physics, Journal of High Energy Physics, Springer, 2017, 05, pp.018. ⟨10.1007/JHEP05(2017)018⟩, New Physics at the Junction of Flavor and Collider Phenomenology, New Physics at the Junction of Flavor and Collider Phenomenology, Apr 2017, Portoroz, Slovenia
Publication Year :: 2017
Publisher :: SpringerOpen, 2017.
Abstract: The quark and lepton mass patterns upset their naive unification. In this paper, a new approach to solve this problem is proposed. Model-independently, we find that a successful unification can be achieved. A mechanism is identified by which the large top quark mass renders its third-generation leptonic partner very light. This state is thus identified with the electron. We then provide a generic dynamical implementation of this mechanism, using tree-level exchanges of vector leptons to relate the quark and lepton flavor structures. In a supersymmetric context, this same mechanism splits the squark masses, and third generation squarks end up much lighter than the others. Finally, the implementation of this mechanism in SU(5) GUT permits to avoid introducing any flavor structure beyond the two minimal Yukawa couplings, ensuring the absence of unknown mixing matrices and their potentially large impact on FCNC.<br />Comment: 31 pages, 5 figures