Tuesday, March 5, 2024, 3:30 pm — Large Seminar Room, Bldg. 510

Please note that self-served coffee and cookies will be in the seminar lounge at 3:00 pm.
Abstract:
Scattering amplitudes are where quantum field theory meets particle experiment, especially at the Large Hadron Collider where the copious scattering of quarks and gluons in quantum chromodynamics (QCD) produces Higgs bosons and many backgrounds to searches for new physics. Particle scattering in QCD and other gauge theories is far simpler than standard perturbative approaches would suggest. Modern approaches based on unitarity and bootstrapping dramatically simplify many computations previously done with Feynman diagrams. Even so, the final results are often highly intricate, multivariate mathematical functions, which are difficult to describe, let alone compute. In many cases, the functions have a "genetic code" underlying them, called the symbol, which reveals much of their structure. The symbol is a linear combination of words, sequences of letters analogous to sequences of DNA base pairs. Understanding the alphabet, and then reading the code, exposes the physics and mathematics underlying the scattering process, including new symmetries. For example, the two scattering amplitudes that are known to the highest orders in perturbation theory (8 loops) are related to each other by a mysterious antipodal duality, which involves reading the code backwards as well as forwards. A third scattering amplitude, which contains both of these as limits, has an antipodal self-duality which "explains" the other duality. However, we still don't know `who ordered' this property, or what it really means.

Not all computers/devices will add this event to your calendar automatically.

A calendar event file named "calendar.ics" will be placed in your downloads location.
Depending on how your device/computer is configured, you may have to locate this file
and double click on it to add the event to your calendar.

Event dates, times, and locations are subject to change.
Event details will not be updated automatically once you add
this event to your own calendar. Check the Lab's Events Calendar
to ensure that you have the latest event information.