BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//wp-events-plugin.com//7.2.3.1//EN
TZID:Europe/Berlin
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VEVENT
UID:2212@qft.physik.hu-berlin.de
DTSTART;TZID=Europe/Berlin:20250124T133000
DTEND;TZID=Europe/Berlin:20250124T143000
DTSTAMP:20250123T081021Z
URL:https://qft.physik.hu-berlin.de/next-seminars/agostino-patella-hu-berl
 in-2/
SUMMARY:Agostino Patella (HU Berlin) - 
DESCRIPTION:Speaker: Agostino Patella\n\nTitle: Spectral densities from th
 e lattice: explorations in the O(3) non-linear sigma model\n\nAbstract:\nQ
 CD spectral densities are interesting intermediate quantities related to a
  number of physical observables. For instance\, the R-ratio\, i.e. the pro
 perly normalized total cross section of the process (e+ e- -&gt\; hadrons)
 \, can be expressed in terms of the spectral density of the electromagneti
 c current. The non-perturbative nature of QCD prevents us to use analytic 
 methods to calculate observables at low energy\, and one would like to und
 erstand whether it is possible to use lattice simulations to calculate spe
 ctral densities at low energies. In this talk\, I will explain how spectra
 l densities are defined\, why they are phenomenologically interesting and 
 why it is difficult to calculate them in the context of lattice simulation
 s. I will discuss a particular method that has been put forward recently\,
  based on the idea that one can approximate smeared spectral densities and
  I will show how this method works in a toy model\, i.e. in the O(3) non-l
 inear sigma model.
CATEGORIES:Pizza Seminars
LOCATION:Room 1.221\, IRIS building\, Zum großen Windkanal 6\, Berlin\, 12
 489\, Germany
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Zum großen Windkanal 6\, B
 erlin\, 12489\, Germany;X-APPLE-RADIUS=100;X-TITLE=Room 1.221\, IRIS build
 ing:geo:0,0
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:STANDARD
DTSTART:20241027T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
END:STANDARD
END:VTIMEZONE
END:VCALENDAR