Northwestern Events Calendar

Apr
19
2023

PAECRS: Kaan Simsek and Genevieve Schroeder

When: Wednesday, April 19, 2023
12:00 PM - 1:00 PM CT

Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it

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

Contact: Joan West  

Group: Department of Physics and Astronomy

Category: Lectures & Meetings

Description:

Beyond the Standard Model Searches at the Large Hadron-electron Collider and the Electron-Ion Collider

Kaan Simsek, PhD Student, Petriello Group

Accomplishments of the Standard Model (SM) of particle physics are many. With the discovery of the Higgs particle, the predicted spectrum is complete. There has been neither conclusive evidence for new particles beyond the SM (BSM) nor remarkable deviation from the SM predictions. Nevertheless, just like anything nice, the SM suffers from certain shortcomings, such as missing explanations of dark matter observed in this pointless universe, baryon-antibaryon asymmetry, and neutrino masses. In an attempt to address these lingering issues of our understanding of the nature, many experimental programs have been launched or are under design. In this talk, we restrict our attention to the Large Hadron-electron Collider (LHeC) and the Electron-Ion Collider (EIC). We study BSM searches using deeply-inelastic-scattering cross section of electron-hadron scattering and parity-violating asymmetries in said cross section within the framework of the SM Effective Field Theory (SMEFT). We find that the bounds on BSM parameters obtained at the LHeC are remarkably stronger than the ones obtained at the EIC and that both have the potential to resolve blind spots observed in more extensive fits of electroweak pole observables and diboson, Higgs, and top quark data.

 

What GRBs Do in the Shadows: A Radio Bright, Dust Obscured Population of GRBs

Genevieve Schroeder, PhD Student-Astronomy, Fong Group

Long gamma-ray bursts (GRBs) are among the most energetic explosions in the universe, and are commonly accepted to come from the core collapse of massive stars. These explosive events produce broadband (X-ray to radio) synchrotron emission, known as the "afterglow", which can be modeled to determine burst properties such as burst energy, circumburst density, and jet opening angle. However, a subset of these long GRBs encounter significant amounts of dust obscuration along the line of sight, leading to a suppressed optical afterglow that is often faint or undetected ("dark" GRB).  Radio detections of these dark GRBs can break modeling degeneracies caused by the lack of optical emission, constraining the low frequency end of the synchrotron spectrum while the X-ray afterglow as observed by satellites such as Swift constrain the high frequency end. I will present a sample of dark GRBs, revealed by bright radio detections, whose afterglows and host galaxies I modeled in order to determine burst, environmental, and global properties. I compare the dark GRB population to the unobscured long GRB population to determine what, if anything, sets dark GRBs apart from the unobscured long GRB population, as well as determine the location of the dust along the line of sight of the GRB. I conclude with placing constraints on obscured star formation within the host galaxies of long GRBs, and make predictions for the radio detectability of long GRB hosts with future radio observatories.

 

 

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