Removing Flat Directions in SMEFT Fits: LHC, EIC and PVES
Dr. Daniel Weigand
Argonne National Laboratory
LHC, besides its amazing success in confirming our Standard Model predictions, has not delivered any direct evidence of Physics beyond the Standard Model. Part of the LHC legacy will be to put the collected data into perspective and efficiently constrain new physics. The Standard Model Effective Theory (SMEFT) is the appropriate tool for analyzing the data and constraining new Physics in a model-independent way. When constraining the coefficients parametrizing the SMEFT through data, one encounters so-called flat directions that negatively impact the size of the resulting bounds. After a general introduction to the methodology of SMEFT I will present two novel approaches to lifting flat directions present in the bounds set by LHC data. The future Electron-Ion Collider (EIC) at Brookhaven National Lab will perform measurements with polarized electron and polarized proton beams. I will show that if correctly combined these measurements can be used to shrink the available SMEFT parameter space previously constrained by LHC data. Similarly, I will show that upcoming low-energy parity-violating electron scattering experiments (PVES) are well-suited to disentangle contributions from higher-dimensional SMEFT operators. They can therefore be used in complementary roles to the bounds set by LHC measurements.
Hosted by Prof. Tsai
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