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SUMMARY:Nonrelativistic QCD for coloured scalars
DTSTART;VALUE=DATE-TIME:20051028T100000Z
DTEND;VALUE=DATE-TIME:20051028T110000Z
DTSTAMP;VALUE=DATE-TIME:20261113T050834Z
UID:indico-event-1451@indico.ific.uv.es
DESCRIPTION:It is a special feature of pair production of heavy coloured p
 articles close to threshold that multi-gluon exchange leads to singular te
 rms ~(alpha_s/v)^n and ~(alpha_s Log v)^n in the amplitude that for v~alph
 a_s have to be summed to all orders in alpha_s. This is achieved most effi
 ciently within an effective field theory. For top pair threshold productio
 n the effective theory vNRQCD (velocity non-relativistic QCD) was develope
 d to carry out this summation program aiming for NNLL order precision. For
  squark-antisquark pair threshold production previous studies involved lea
 ding-logarithmic (LL) precision. Higher order QCD or electroweak effects w
 ere not taken into account in a systematic manner\, although it is known f
 rom the top threshold that corrections to the LL approximation can be subs
 tantial. In this talk I will present the vNRQCD Lagrangian for a particle-
 antiparticle pair of heavy non-relativistic colored scalars. The matching 
 conditions and anomalous dimensions required for renormalization group imp
 roved computations of threshold pair production at next-to-leading logarit
 hmic (NLL) order and scalar-antiscalar bound state energies at NNLL order 
 in the non-relativistic expansion will also be presented. The proposed EFT
  framework suffices to describe threshold production of squarks in e^+e^- 
 annihilation\, in particular of the lighter scalar top quark at the future
  Linear Collider.\n\nhttps://indico.ific.uv.es/event/1451/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1451/
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