NYU Arts & Science

Other Center for Cosmology and Particle Physics Events

May 17, 2024 Friday 10:30 AM  +
726 Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events (ccpp)

Special Seminar
Riccardo Rattazzi
EPFL Lusanne

Behind & Beyond the Standard Model (Day 5)

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. Sections 1. Ideology. The two modern perspectives on QFT: Effective Field Theory and RG-flow 2. Symmetries, Selection rules & Naturalness 3. Behind the Standard Model, or the SM as an EFT 4. Beyond the Standard Model - Supersymmetry - Compositeness - Naturalness vs Simplicity

Watch video here



May 20, 2024 Monday 1:30 PM  +
726 Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events (ccpp)

Special Seminar
Multiple Speakers

Rattazzi & Friends

Preliminary schedule 1:30-2:00: Welcome coffee and donuts 2:00-2:50: Alberto Nicolis: "Apparent fine tunings in systems that break spacetime symmetries" 2:50-3:40: Nima Arkani-Hamed:"Surfaceology and the Real World” 3:40-4:20: Coffee Break 4:20-5:10: Anson Hook: "A dynamical Explanation of the dark matter baryon coincidence" 5:10-6:00: Markus Luty: "Conformal invariance of IR fixed points”