Preface

The eleventh Event in the series of CERN Latin-American Schools of High-Energy Physics took place from 15 to 28 March 2023 in San Esteban, Chile. It was organized by CERN with the support of Chilean colleagues from Universidad Andrés Bello, Universidad Tecnica Federico Santa Maria, and CCTVal (Valparaiso Center for Science and Technology). Our thanks are due to the lecturers and discussion leaders for their active participation in the School and for making the scientific programme so stimulating. The students who in turn manifested their good spirits during two intense weeks undoubtedly appreciated their personal contributions in answering questions and explaining points of theory.