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UID:DSC-23018
DTSTART;TZID=Europe/Berlin:20260709T150000
SEQUENCE:1783575438
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20260709T160000
URL:https://dresden-science-calendar.de/calendar/en/detail/23018
LOCATION:TUD Andreas-Schubert-Bau\, Zellescher Weg 1901069 Dresden
SUMMARY:Seminar: Infrared divergences and the choice of renormalisation sch
 eme
CLASS:PUBLIC
DESCRIPTION:Speaker: \nInstitute of Speaker: \nTopics:\nPhysik\, Willkommen
 \n Location:\n  Name: TUD Andreas-Schubert-Bau (E19)\n  Street: Zellescher
  Weg 19\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDescription: <p>Quantu
 m Field Theoretical calculations are known to contain infinities at interm
 ediate steps\, stemming from assumptions that spacetime is continuous down
  to arbitrarily small distances (ultraviolet divergences) or that interact
 ions do not fall off fast enough with distance (infrared divergences). The
 se two regimes do not interact physically. They can\, however\, become int
 ertwined by the regularisation/renormalisation procedure used to obtain me
 aningful expressions at intermediate steps\, especially in the context of 
 dimensional regularisation.<br> <br> In this talk\, I will discuss some th
 eoretical issues arising in the calculation of next-to-leading-order corre
 ctions to processes renormalised in non-on-shell schemes. I will explain t
 he origin of infrared and ultraviolet divergences. I will illustrate with 
 a simple example why the mass assignment requested by the Lehmann–Symanz
 ik–Zimmermann reduction formula yields an off-shell regularisation that 
 gives the wrong result if applied naively. Finally\, I will provide a pres
 cription for obtaining correct results\, based on unitarity and Cutkosky's
  cutting rules. </p>
DTSTAMP:20261001T223836Z
CREATED:20260702T053826Z
LAST-MODIFIED:20260709T053718Z
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