Phd in Physics

Effective field theory techniques for New Physics searches_23

05 - Effective field theory techniques for New Physics searches

Academic year 2023/2024

Sommario del corso

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Program

"Effective field theories (EFTs) constitute an essential technique in physics, allowing for the systematic separation of largely different scales in a problem, i.e. for exploiting hierarchies. Such hierarchies occur everywhere in physics; in the Standard Model (SM) examples are the hierarchy between the masses of the massive gauge bosons and the top quark compared to those of all other fermions, or the mass of the bottom quark compared to typical hadronic scales. Importantly, the absence of indications for new states beyond the SM ones indicates that such states might be very heavy. As a consequence, their impact on low-energy observables can be treated in an EFT framework; precision measurements at much lower energies can then be used to constrain New Physics models strongly, even if the corresponding states cannot be produced at existing colliders.

The plan of the course is to introduce EFT techniques in general, discussing their applicability and restrictions. The developed methods are then applied to the case of Standard Model Effective Field Theory (SMEFT),  in order to obtain a general framework for treating new-physics contributions with heavy degrees of freedom compared to the SM ones.

Notes

Students wishing to take this course must register with the teacher via email

Period

March-April 2024

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