Abstract: One of the main frontiers in elementary particle physics is the search for new particles and new forces beyond those present in the Standard Model (SM) of particle physics. The direct searches at the Large Hadron Collider (LHC) at CERN, even a decade after the Higgs discovery, did not provide any hint on what these new particles and forces could be. As a result, on the one hand, the indirect searches for beyond SM (BSM) physics through very rare processes gained importance, at the same time the indication from LHC that the scale (or equivalently the masses of new particles) should be much above the electroweak scale ~ 100 GeV, motivates the use of Effective Field Theories (EFTs) -- which can describe physics below an energy scale without even knowing about the yet unknown ultraviolet theory.

Notably, the indirect searches allow us to see footprints of new particles and forces acting at much shorter distances than it is possible to explore at the LHC and presently planned high-energy colliders. While the LHC can explore distance scales as short as 10^−19m, the indirect search with the help of suitably chosen processes can offer us information about scales as short as 10^−21m that cannot be probed even by the planned 100TeV proton-proton collider at CERN. Even shorter scales can be explored in this manner. The EFTs will play a fundamental role in this kind of research program.

In this seminar, I will discuss my recent work on the development of EFTs, their applications for indirect searches, and computer tools to automate the calculations. In the first part of the seminar, I will discuss the key technical aspects of the EFTs relevant to BSM phenomenology. In particular, starting with a discussion on the basic principles of EFTs, I will present my work on renormalization scheme independence and renormalization group running. In the second part, I will focus on applications of the EFTs for the BSM searches.

Meeting ID: 932 4963 6965
Passcode: 973396