Particle Physics Seminar: Getting more out of jets: quark spin correlations, quantum properties, fragmentation tagging

Abstract:

While spin correlations and spin entanglement have been measured for top quarks at the LHC, they remain unexplored for other quark flavors.

In this talk, I will present analysis strategies for measuring spin correlations, entanglement, and Bell nonlocality in bottom-quark pairs using the partial preservation of spin information in baryons from bottom-quark fragmentation. We find that certain measurements are within reach with existing datasets, while others will become possible at the HL-LHC. Some of these measurements are feasible for charm quarks as well. The proposed measurements will also provide new information on the poorly known polarized fragmentation functions.

I will also introduce the concept of "fragmentation tagging" -- the task of identifying the fragmentation channel of a quark. I will describe a possible machine learning approach to this, illustrated by differentiating between bottom jets containing a bottom baryon and those containing a bottom meson. 

Seminar Organizer: Dr. Michael Geller