1994/07/19 by Ernest Baver, Miriam Leurer
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.51.260
published as Phys.Rev. D51 (1995) 260-264 · 12 pages LaTeX. WIS-94/27/Jul-PH
arxiv created 1994/07/19 · openalex publication_date 1995/01/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Light first generation leptoquarks are being hunted for at the DESY ep collider HERA and at Fermilab and there are various proposals for further searches in future machines. Such leptoquarks are, however, problematic from a theoretical point of view: Low energy precision measurements imply strong constraints on the couplings of the leptoquarks, and up until now the fulfillment of these constraints seemed extremely unnatural. Here we show that horizontal symmetries, which are very conventional and widely used in the literature for completely different purposes, can suppress the unwanted couplings. Therefore light first generation leptoquarks can be natural.