5,019 research outputs found
Next-to-next-to-leading order -jettiness soft function for production
We calculate the -jettiness soft function for production up to
next-to-next-to-leading order in QCD, which is an important ingredient of the
-jettiness subtraction method for predicting the differential cross sections
of massive coloured particle productions. The divergent parts of the results
have been checked using the renormalization group equations controlled by the
soft anomalous dimension.Comment: 14 pages, 3 figures, published version in PL
Fully Differential Higgs Pair Production in Association With a Boson at Next-to-Next-to-Leading Order in QCD
To clarify the electroweak symmetry breaking mechanism, we need to probe the
Higgs self-couplings, which can be measured in Higgs pair productions. The
associated production with a vector boson is special due to a clear tag in the
final state. We perform a fully differential next-to-next-to-leading-order
calculation of the Higgs pair production in association with a boson at
hadron colliders, and present numerical results at the 14 TeV LHC and a future
100 TeV hadron collider.Comment: 7 pages, 7 figures, matched to the published version in PL
A framework for second-order parton showers
A framework is presented for including second-order perturbative corrections
to the radiation patterns of parton showers. The formalism allows to combine
O(alphaS^2)-corrected iterated 2->3 kernels for "ordered" gluon emissions with
tree-level 2->4 kernels for "unordered" ones. The combined Sudakov evolution
kernel is thus accurate to O(alphaS^2). As a first step towards a full-fledged
implementation of these ideas, we develop an explicit implementation of 2->4
shower branchings in this letter.Comment: 11 pages, 3 figure
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