20.500.12556/DiRROS-30358 TeV scale quark-lepton unification We propose a quark-lepton symmetric Pati-Salam (PS) model based on the gauge group SU(2)L × SU(2)R × SU(4)C with an E6-inspired particle spectrum which naturally accommodates a multi-TeV leptoquark gauge boson . A softly broken Z2 symmetry plays a crucial role in realizing this scenario, under which the Standard Model (SM) fermions are even, while new vector-like fermions present in the model are odd. A notable feature of this model is that the PS gauge boson Xμ itself is Z2-odd, causing it to couple exclusively between SM fermions and the vector-like fermions, except in the right-handed down-quark sector, where mixing is induced by the soft breaking of Z2. This structure leads to helicity suppression of tree-level meson decays mediated by Xμ, with Z2-unsuppressed contributions arising only via one-loop diagrams. We show that Xμ can be as light as 1.1 TeV while being compatible with all flavor-violating constraints. However, mass relations among the gauge bosons push the Xμ mass limit up to 4.3 TeV from the stringent LHC bounds on the Z′ mass. This comparatively low PS-breaking scale opens up promising collider opportunities for probing the leptoquark gauge boson, as well as the distinctive signature of vector-like down-type quarks carrying an unusual baryon number of 2/3. The model can be further tested via lepton flavor-violating processes induced by the leptoquark gauge boson, such as μ → eγ, μ → eee, and μ-e conversion in nuclei. Neutrino masses arise in the model through dimension-seven operators at tree-level, as well as from dimension-five operators via one-loop diagrams. new gauge interactions specific BSM phenomenology theories of flavour nove merilne interakcije specifična fenomenologija fizike onkraj Standardnega modela teorije okusa true false true Published for SISSA by Springer. Italija Angleški jezik Slovenski jezik © The Authors. Neznano 2026-06-23 11:49:37 2026-06-23 11:49:37 2026-06-24 03:46:08 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Opis vira z dne 22. 6. 2026; str. 1-67 Vol. 2026, article no. 23 (2026) 3 June 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-12-27 2026-04-10 2026-06-03 539.1 1029-8479 10.1007/JHEP06(2026)023 282398979 https://link.springer.com/article/10.1007/JHEP06(2026)023 1 daa72e96-6ee8-11f1-98c5-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=46056 RAZ_Babu_K._S._2026.pdf RAZ_Babu_K._S._2026.pdf 1 04385F34418F75F081C8FE0107EEC0A6 8f0986b3e8184ce237c0b1cff7665615708d8fb48f9b9416db8ce0ae4cc37224 6de28929-6ee9-11f1-98c5-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=46057 Institut Jožef Stefan 0 0 0