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SUMMARY:Charting the Fifth Force Landscape - Hannah Banks (DAMTP)
DTSTART:20201203T160000Z
DTEND:20201203T170000Z
UID:TALK154426@talks.cam.ac.uk
CONTACT:Joseph Davighi
DESCRIPTION:*The seminar will take place via vidyo "here":https://indico.c
 ern.ch/event/980408/.\nThe explicit url is: https://indico.cern.ch/event/9
 80408/.*\n\nAbstract:  In recent years particle physics research has under
 gone somewhat of a phase transition\, looking increasingly towards hidden 
 sectors and the feebly interacting frontier. In this talk I will introduce
  a new approach to parameterising dark sector forces\, underpinned by the 
 Källén-Lehman representation\, in which the effects of any general scala
 r fifth force are captured by a single positive-definite spectral function
 . Using this language\, I will demonstrate how the effects of loop-level f
 orces can be simply obtained\, without needing to explicitly perform loop 
 calculations. I will also show how   experimental observables can be expre
 ssed in completely general terms\, facilitating the straightforward extrac
 tion of limits to any specific model. Finally\, I will discuss how this fr
 amework opens the possibility to speculatively probe violations of unitari
 ty\, causality or locality within hidden sectors.
LOCATION:Virtual Seminar 
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