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SUMMARY:Md. Abhishek\, "Why is the on-shell technique better than the off-
shell technique to compute scattering amplitudes?"
DTSTART:20240508T140000Z
DTEND:20240508T150000Z
DTSTAMP:20240725T090000Z
UID:indico-event-41188@agenda.infn.it
DESCRIPTION:The scattering cross section\, which counts the number of scat
tering events\, is proportional to the square of the scattering amplitude.
In perturbative quantum field theory\, we use Feynman diagrams to compute
scattering amplitudes. Although Feynman diagrams are very efficient for a
smaller number of legs and loops\, the number of diagrams increases facto
rially with the external legs. The reason behind the complexity of Feynman
diagram computation is that individual Feynman diagrams contain off-shell
internal lines and are gauge-dependent. On the other hand\, scattering am
plitudes are only a function of on-shell quantities and are gauge-invarian
t. On-shell techniques to compute scattering amplitudes have made enormous
progress in the last couple of decades. The main focus of on-shell comput
ation is to evaluate the analytic expression of the final amplitude withou
t involving the complications of off-shell computation. In this talk\, I w
ill discuss the well-known Britto-Cachazo-Feng-Witten (BCFW) on-shell recu
rsion relation to construct a higher-point tree-level scattering amplitude
from a lower-point one.\n\nhttps://agenda.infn.it/event/41188/
LOCATION:2G26
URL:https://agenda.infn.it/event/41188/
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