Joe Davighi: Leptoquarks with exactly stable protons

Thursday 9 Jun 2022, 11:00 → 12:00 Europe/Ljubljana

Tea room of F-1 department. (Also via zoom https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09)

We explore a novel mechanism to restrict TeV-scale leptoquark interactions and render the proton exactly stable to all orders in the effective field theory expansion. A scalar condensate breaks a lepton-flavored U(1) gauge symmetry in the ultraviolet and generates realistic neutrino masses, leaving a discrete Z_9 or Z_{18} gauge symmetry that persists to the deep infrared. This remnant symmetry conserves baryon number mod 3, forbidding proton decay, neutron oscillations and more, while allowing sphaleron-induced leptogenesis. This provides an elegant framework to address the flavour anomalies and can be adapted to many other new-physics models. The U(1) can emerge from a gauge-flavour unified SU(12) x SU(2) x SU(2) theory at even higher energies.