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SUMMARY:A new look for the pion form factor - Matthew Kirk (Durham U.)
DTSTART:20250307T160000Z
DTEND:20250307T170000Z
UID:TALK226183@talks.cam.ac.uk
CONTACT:Nico Gubernari
DESCRIPTION:In this talk\, I will discuss a novel and simple parametrisati
 on of meson form factors that can be used to describe data above and below
  the pair production threshold\, using the pion form factor as a simple ex
 ample (in which case our parameterisation describes both $\\pi \\to \\pi^0
 $ and $0 \\to \\pi \\pi$ processes).\nTo start with\, I will introduce and
  walk through the derivation of dispersive bounds on form factors\, then e
 xplain the difficulties in the traditional approach with a description of 
 the above threshold data due to resonant poles\, and the known asymptotic 
 properties of the form factor in this region.\nUsing data from $\\pi$-H sc
 attering and the $\\tau \\to \\pi \\pi \\nu$ decay\, I will show how with 
 less than 5 free parameters (including the rho mass and decay width)\, we 
 can excellently describe the data.\nThis talk is based on my work in arXiv
 :2410.13764.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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