Events List

DateEvent TypeSpeaker
05/01/2024ArXiv DiscussionHEP/Pheno Journal Club [ + ]
05/01/2024HEP SeminarMichael Toomey [ + ]
05/02/2024Oral DefenseXucheng Gan [ + ]
05/02/2024Oral DefenseConghuan Luo [ + ]
05/02/2024Physics Dept ColloquiumKathleen Stebe [ + ]
05/03/2024HEP Discussion SessionsZare [ + ]
05/03/2024Oral DefenseMilad Noorikuhani [ + ]
05/06/2024CCPP Brown BagPatrick Breysse [ + ]
05/07/2024Special SeminarAashay Pai [ + ]
05/07/2024Grad Pheno Journal Club [ + ]
05/10/2024HEP Discussion SessionsZare [ + ]
05/13/2024Special SeminarRiccardo Rattazzi [ + ]
05/14/2024Special SeminarRiccardo Rattazzi [ + ]
05/15/2024Special SeminarRiccardo Rattazzi [ + ]
05/16/2024Special SeminarRiccardo Rattazzi [ + ]
05/17/2024Special SeminarRiccardo Rattazzi [ -- ]

Title: Behind & Beyond the Standard Model (Day 5)
Abstract: This course is essentially divided into three parts. I first introduce the modern Effective Field Theory perspective on Quantum Field Theory. I discuss in particular the role of symmetries and the notion of naturalness, offering a critical analysis of the origin of hierarchical mass scale separations. In the second part I analyze in the light of those concepts the Standard Model, highlighting how its remarkable phenomenological adequacy structurally relies on a seemingly unnatural scale separation. In the third part, I present the two main extensions of the SM, Compositeness and Supersymmetry, capable of producing a natural scale separation. I illustrate how these scenarios spoil the structural simplicity at the basis of the phenomenological adequacy of the SM and require somewhat ad hoc model building hypotheses. That creates a paradoxical tension between naturalness and simplicity, which defines in my mind the so-called hierarchy paradox. I will illustrate where past, present and future collider experiments stand in the exploration of this matter. Behind & Beyond the Standard Model 1. Ideology - The two modern perspectives on QFT: Effective Field Theory and RG-flow - Symmetries (with their accidentality), Selection rules & Naturalness - Critical analysis of scale separation in QFT (natural and unnatural hierarchies) 2. The SM as an EFT (in its entirety not just as CERN’s T-shirt) - the phenomenal structure of the renormalizable truncation of the SM, aka the T-shirt lagrangian. (baryon& lepton number, flavor selection rules, custodial symmetry) -concrete illustration of the above: FCNC and CP violation suppression, a quick view of precision electroweak tests - the Higgs sector and the difficulty to account for the scale separation supporting the phenomenal properties of the T-shirt lagrangian 3. Beyond the Standard Model and the Hierarchy paradox - models that address (even partially) the natural origin of scale separation: their plus and their minuses - Supersymmetry - Compositeness - Naturalness vs Simplicity - the relevance of collider experiments, present and future - if interest exist I can give an additional lecture on a more formal perspective on supersymmetric models (soft supersymmetry breaking from the susy cfts standpoint) (10:00 AM - 1:00 PM, Columbia University)
05/27/2024Holiday [ + ]
06/19/2024Holiday [ + ]
07/04/2024Holiday [ + ]
07/05/2024Holiday [ + ]
09/02/2024Astro Seminar [ + ]