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DTSTART:20260329T010000
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DTSTART:20261025T010000
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DTSTART;TZID=Europe/Rome:20261113T110000
DTEND;TZID=Europe/Rome:20261113T133000
DTSTAMP:20261024T230259
CREATED:20261023T093911Z
LAST-MODIFIED:20261023T093911Z
UID:41786-1794567600-1794576600@w3.lnf.infn.it
SUMMARY:QCD corrections for tt̄+X hadroproduction
DESCRIPTION:Speaker: Colomba Brancaccio (MPP Munich) \nTop-quark pair production in association with a jet\, a photon or a Higgs boson is of high priority in the LHC precision programme\, and matching the precision of the experimental data requires predictions at NNLO in QCD. In this talk I review recent progress on tt̄+X at this accuracy. I first discuss tt̄H production in the framework of perturbative fragmentation functions. The latter describe the nearly collinear emission of a Higgs boson from a top quark and reproduce the leading mass dependence of the exact NLO calculation\, while the extension to NNLO introduces nontrivial subtleties and complications. I then turn to tt̄j\, where the two-loop five-point amplitudes have long been the bottleneck towards NNLO predictions for this process. I present their leading-colour computation: the finite remainder is reconstructed analytically from finite-field evaluations using a tailored set of special functions evaluated through numerical integration of its differential equations. This result has made NNLO QCD predictions for the pp->tt̄j cross section and differential distributions possible. Finally\, I show how the same techniques apply to the planar two-loop integrals relevant for tt̄γ hadroproduction at leading-colour\, as a first step towards the NNLO computation of this process.
URL:/event/qcd-corrections-for-ttx-hadroproduction/
LOCATION:Aula Salvini
CATEGORIES:Seminari teorici
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