May 17, 2024 Friday 10:30 AM
+

726 Broadway, 940, CCPP Seminar

**Other Center for Cosmology and Particle Physics Events**
(ccpp)

726 Broadway, 940, CCPP Seminar

**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

May 20, 2024 Monday 1:30 PM
+

726 Broadway, 940, CCPP Seminar

**Other Center for Cosmology and Particle Physics Events**
(ccpp)

726 Broadway, 940, CCPP Seminar

**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”