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SUMMARY:#StudentSeminar: Combining QED and QCD transverse-momentum resumma
 tion for Drell-Yan production at hadron colliders
DTSTART;VALUE=DATE-TIME:20251006T130000Z
DTEND;VALUE=DATE-TIME:20251006T140000Z
DTSTAMP;VALUE=DATE-TIME:20260421T035444Z
UID:indico-event-8256@indico.ific.uv.es
DESCRIPTION:The study of collider physics is nowadays the main tool to stu
 dy and deeply understand the most accredited theory describing particles a
 nd their interactions: the Standard Model.\nThe Standard Model is a quantu
 m field theory with local gauge symmetry: SU(3) × SU(2) × U(1). Matter i
 s composed of fermions\, half-spin particles\, which interact through the 
 exchange of bosons\, spin-1 particles. An additional spin-0 boson\, the Hi
 ggs boson\, is introduced to explain the generation of masses via the Higg
 s mechanism.\n\nThe main focus of this talk is the production\, at hadron 
 colliders such as the LHC and Tevatron\, of the Z and W bosons\, which med
 iate the weak interaction. Among the various kinematic distributions\, a s
 pecial role is played by the transverse-momentum distribution (i.e. moment
 um perpendicular to the beam axis).\nThe corresponding cross sections are 
 obtained through the factorization theorem\, which expresses them as the c
 onvolution of the parton distribution functions (PDFs)—universal functio
 ns—with the partonic cross section\, calculable within quantum chromodyn
 amics (QCD) and quantum electrodynamics (QED) and object of our theoretica
 l study. \n\nQCD provides the dominant contributions\, and in the region 
 where the transverse momentum is of the order of the weak-boson mass\, sta
 ndard perturbative expansions can be applied. However\, at small transvers
 e-momentum values\, large logarithmic terms\, arising from soft and/or col
 linear parton emission\, spoil the convergence of the series. To restore t
 he predictive power of perturbation theory\, these terms must be evaluated
  and resummed to all orders. Resummation\, in turn\, can be performed to d
 ifferent levels of accuracy\, much like a standard perturbative expansion.
 \n\nAlthough QCD radiative corrections dominate\, the inclusion of QED cor
 rections is necessary to achieve high precision\, since the two coupling c
 onstants are related by α² ~ αs. In this case\, we consider photon emis
 sion that can be soft and/or collinear. \n\nIn this talk I will discuss t
 he combined QCD+QED resummation formalism\, focusing on (i) the case of W-
 boson production\, and (ii) the impact of QED corrections. In particular\,
  we obtain all numerical predictions using the Fortran code DYqT\, and we 
 find that QED effects range from the per-mille to the percent level.\n\nht
 tps://indico.ific.uv.es/event/8256/
LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario
URL:https://indico.ific.uv.es/event/8256/
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