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SUMMARY: Jim Talbert - New insights on strong coupling extractions from So
 ft Collinear Effective Theory - Jim Talbert (DAMPT)
DTSTART:20211119T160000Z
DTEND:20211119T170000Z
UID:TALK166015@talks.cam.ac.uk
CONTACT:Rene Poncelet
DESCRIPTION:*The seminar will take place in the Potter Room at DAMPT and w
 ill be broadcast via Zoom "here":https://us02web.zoom.us/j/85896693592?pwd
 =cDBJMVJJNlkwcG9FWFBJNTJmTTJyQT09.*\n\nAbstract: I will discuss the applic
 ation of Soft Collinear Effective Theory (SCET) to the extraction of the s
 trong coupling constant from e+e- event shape distributions\, where state-
 of-the-art results exhibit a 3-4 sigma discrepancy with respect to the PDG
  world average.  After introducing event shape distributions and the SCET 
 resummation formalism we use to study them\, I will then focus on the cano
 nical 'Thrust' variable\, and on the phenomenological treatment of non-per
 turbative effects stemming from the soft sector.  In particular\, I will s
 how that equivalently well-defined renormalon subtraction schemes can lead
  to significant shifts in the extracted values of the strong coupling\, wh
 en studying two-parameter fits in the dijet region.  After discussing othe
 r generic systematics associated to extractions (and their potential impac
 t on results)\, I hope to briefly mention novel (non-)perturbative extract
 ion opportunities using the 'Angularities' class of observables\, which ge
 neralizes the Thrust variable.
LOCATION:Hybrid Seminar 
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