Seminars IFIC

Implications of Non-Decoupling UV-Physics

por Dr. Claudius Krause (IFIC Valencia)

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

1001-Primera-1-1-1 - Paterna. Seminario


Recent results from the LHC indicate a mass gap between the electroweak scale and the scale of new physics. This motivates using bottom-up effective field theories (EFTs) for model-independent searches of physics beyond the Standard Model. I will review the construction of the two bottom-up EFTs for the Standard Model: the SMEFT describing decoupling new physics, and the electroweak chiral Lagrangian describing non-decoupling scenarios. I will focus on the latter, as the power counting estimates large deviations in Higgs sector and subleading corrections in the gauge-fermion sector, reflecting the current experimental constraints. To study the impact of non-decoupling effects from heavy (TC) resonances, I assume a set of new, heavy states that couple to the light fields, in analogy to the QCD resonances in chiral perturbation theory. These new states have bosonic quantum numbers JP=0±, or JP=1±; are color-singlets or -octets; and they are singlets or triplets of the electroweak SU(2). I analyze the pattern of low-energy constants that the new states generate when they are integrated-out. Further, I will discuss the constraints that the LHC puts on the Wilson-coefficients of the electroweak chiral Lagrangian.
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