BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:"Contact effective field theory for nuclear physics and systems cl
 ose to unitarity" Lorenzo Contessi (SphN)
DTSTART:20200228T094500Z
DTEND:20200228T114500Z
DTSTAMP:20260607T225000Z
UID:indico-event-20596@indico.in2p3.fr
DESCRIPTION:Effective field theory changed the way in which quantum intera
 ctions are thought and developed. Nuclear physics is not an exception to t
 his. The possibility of exchanging pions between nucleons makes the expans
 ion of the interaction around nucleonic and pionic degrees of freedom the 
 most natural choice. However\, this procedure introduces some technical di
 fficulties for example\, the one-pion-exchange results to be not easily re
 normalizable and the powercounting orders are not trivial to be determined
 .\nAlthough\, in many nuclear processes\, the momenta involved are very so
 ft and can not resolve the pion exchange. This opens the possibility to us
 e contact EFT instead of meson exchanges. While limited in the momentums t
 hat can be described\, this class of theories preserve renormalizability a
 nd has a very limited number of inputs that need to be fitted. Despite his
  simplicity\, this theory still retains predictive power on non-trivial fe
 w- and many-body effects. In this seminar\, I am going to describe how Con
 tact EFT for nuclear physics (which takes the name of Pionless theory) is 
 constructed and what are the features\, strengths\, and limitations of thi
 s approach in few- and many-body systems.\n\nThis theory has proven to wor
 k well for several few-body nuclear calculations\, but it is not limited t
 o the nuclear regime. It is\, in fact\, appropriate for all the systems th
 at are close to unitarity (as cold atoms)\, namely that have a two-body ef
 fective rage much smaller than the relative scattering length. The extensi
 on of this theory to different systems will be commented together with som
 e of our latest results in applying it to physical systems that can hardly
  be described with the standard approaches as single- and double-lambda hy
 pernuclei and Lattice nuclei.\n \n\nhttps://indico.in2p3.fr/event/20596/
LOCATION:Mondrian
URL:https://indico.in2p3.fr/event/20596/
END:VEVENT
END:VCALENDAR