Northwestern Events Calendar


HEP Seminar: Daniel Wiegand: Removing flat directions in SMEFT fits: Complementing LHC with EIC and PVDIS

When: Monday, March 8, 2021
4:00 PM - 5:00 PM Central

Where: Online

Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students

Contact: Yas Shemirani   (847) 491-3644

Group: Physics and Astronomy High Energy Physics Seminars

Category: Academic



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 deep inelastic scattering experiments (PVDIS) 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.


Seminar Speaker: Daniel Wiegand, Northwestern University/Argonne National Laboratory

Host: André de Gouvea


Meeting Details:
Monday, March 8, 2021 at 4:00pm (Central Time)

Zoom info:
Please email to get the Zoom meeting link. 

Keywords: Physics, Astronomy, HEP

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