Theory Seminar (High Energy/Cosmology) |
Events During the Week of September 11th through September 18th, 2022
Monday, September 12th, 2022
- The Partonic Picture at High-Energy Lepton Colliders
- Time: 4:00 pm
- Place: Chamberlin 5280
- Speaker: Yang Ma, University of Pittsburgh
- Abstract: After the triumph of discovering the Higgs boson at the CERN Large Hadron Collider, people are getting increasingly interested in studying the Higgs properties in detail and searching for the physics beyond the Standard Model (SM). A multi-TeV lepton collider provides a clean experimental environment for both the Higgs precision measurements and the discovery of new particles. In high-energy leptonic collisions, the collinear splittings of the leptons and electroweak (EW) gauge bosons are the dominant phenomena, which could be well described by the parton picture. In the parton picture, all the SM particles should be treated as partons that radiated off the beam particles, and the electroweak parton distribution functions (EW PDFs) should be adopted as a proper description for partonic collisions of the initial states. Along this line, future ultra-high-energy lepton colliders can be treated as EW version of LHCs. In our work, both the EW and the QCD sectors are included in the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) formalism to perturbatively resum the potential large logarithms emerging from the initial-state radiation (ISR). I will show the results of QCD jet production as well as some other typical SM processes at a possible high-energy electron-positron collider and a possible high-energy muon collider obtained using the PDFs.
- Host: George Wojcik
Tuesday, September 13th, 2022
- No events scheduled
Wednesday, September 14th, 2022
- The BOSS bispectrum analysis at one loop from the Effective Field Theory of Large-Scale Structure
- Time: 4:00 pm
- Place: Chamberlin 5280
- Speaker: Matthew Lewandowski, Northwestern U.
- Abstract: In this talk, I will discuss our recent analysis of the BOSS power spectrum monopole and quadrupole, and the bispectrum monopole and quadrupole data, using the predictions from the Effective Field Theory of Large-Scale Structure (EFTofLSS). Specifically, we use the one-loop prediction for the power spectrum and the bispectrum monopole, and the tree level for the bispectrum quadrupole. After validating our pipeline against numerical simulations as well as checking for several internal consistencies, we apply it to the observational data. We find that analyzing the bispectrum monopole to higher wavenumbers thanks to the one-loop prediction, as well as the addition of the tree-level quadrupole, significantly reduces the error bars with respect to our original analysis of the power spectrum at one loop and bispectrum monopole at tree level. We find significant error bar reduction with respect to the power spectrum-only analysis. Remarkably, the results are compatible with the ones obtained with a power-spectrum-only analysis, showing the power of the EFTofLSS in simultaneously predicting several observables. We find no tension with Planck.
- Host: George Wojcik
Thursday, September 15th, 2022
- No events scheduled
Friday, September 16th, 2022
- No events scheduled