[Theory-seminars] Seminars next week

[Carlota Andres]

Dear all, 

Here is a reminder for next week's seminars:

Theory Seminar:
Monday, November 12th, 1:30PM, Room F326-327,
Guangyao Chen (Georgia State University), "Diffractive heavy quarkonium production using basis light-front quantization wavefunctions" 
BlueJeans connection: https://bluejeans.com/321085255

Abstract: 
We study the diffractive charmonium and bottomonium production in diffractive deep inelastic scattering and ultra-peripheral heavy-ion collisions within the dipole picture. We employ heavy quarkonium light-front wavefunctions obtained in the basis light-front quantization approach. The resulting cross sections are in reasonable agreement with existing experimental data at HERA, RHIC and LHC, including data from LHC run 2. We observe that the coherent production cross-section ratios of excited states to the ground state are insensitive to the dipole model parameters. We also make predictions for the heavy quarkonium production at future Electron-Ion Collider. We show that the diffractive heavy quarkonium production at future electron-ion collisions provide a unique opportunity for a quantitative study of the heavy quarkonium system and the nucleon structure.


Cake Seminar:
Wednesday, November 14th, 1PM, Room F326-327
Colin Egerer (W&M),"Distillation in Lattice QCD Calculations of Nucleon Isovector Charges g_S, g_A, g_T"
BlueJeans link: https://bluejeans.com/195615763

Abstract: 
Reliable calculations in Lattice QCD must confront excited-state contamination and statistical precision, where attempts to reduce excited-state effects are often handled with various "smearing" algorithms. Distillation, a particularly powerful form of smearing has seen extensive use in spectroscopy calculations, yet, until now, has not seen use in calculations of hadronic structure. We investigate the application of the distillation smearing approach, and the use of the variational method with an extended basis of operators facilitated by this approach, in the calculation of the scalar, axial and tensor isovector charges of the nucleon. Quantitative comparisons are made with conventional smearing approaches.

Raza, Vincent, Carlota