88 research outputs found
Two-loop amplitudes for processes and at large Higgs transverse momentum
We compute the two-loop QCD corrections to amplitudes for processes and in the limit when the Higgs
transverse momentum is larger than the top quark mass, . These
amplitudes are important ingredients for understanding higher-order QCD effects
on Higgs transverse momentum distribution at large .Comment: 22 pages, 4 figures, analytical results attached as ancillary file
Two-loop Master Integrals with the Simplified Differential Equations approach
We calculate the complete set of two-loop Master Integrals with two off
mass-shell legs with massless internal propagators, that contribute to
amplitudes of diboson production at the LHC. This is done with the
Simplified Differential Equations approach to Master Integrals, which was
recently proposed by one of the authors.Comment: 4 figures, 6 ancillary files. Version as published in JHE
The Pentabox Master Integrals with the Simplified Differential Equations approach
We present the calculation of massless two-loop Master Integrals relevant to
five-point amplitudes with one off-shell external leg and derive the complete
set of planar Master Integrals with five on-mass-shell legs, that contribute to
many amplitudes of interest at the LHC, as for instance three jet
production, jets etc., based on the Simplified Differential
Equations approach.Comment: Revised version accepted for publication in JHEP. Ancillary files
with results can be downloaded from
https://www.dropbox.com/s/90iiqfcazrhwtso/results.tgz?dl=
Double-real contribution to the quark beam function at NLO QCD
We compute the master integrals required for the calculation of the
double-real emission contributions to the matching coefficients of 0-jettiness
beam functions at next-to-next-to-next-to-leading order in perturbative QCD. As
an application, we combine these integrals and derive the double-real gluon
emission contribution to the matching coefficient of the quark
beam function.Comment: 28 pages, 1 figure; updated ancillary file (accessible through url in
the section "Results"
NNLL soft and Coulomb resummation for squark and gluino production at the LHC
We present predictions for the total cross sections for pair production of
squarks and gluinos at the LHC including a combined NNLL resummation of soft
and Coulomb gluon effects. We derive all terms in the NNLO cross section that
are enhanced near the production threshold, which include contributions from
spin-dependent potentials and so-called annihilation corrections. The NNLL
corrections at TeV range from up to for squark-squark
production to for gluino pair production relative to the NLO results and
reduce the theoretical uncertainties of the perturbative calculation to the
level. Grid files with our numerical results are publicly available.Comment: 42 pages, 17 figures. v2: published version; corrected fig. 6;
generalized eq.(A.5) to arbitrary SU(N) gauge group
Triple-real contribution to the quark beam function in QCD at next-to-next-to-next-to-leading order
We compute the three-loop master integrals required for the calculation of
the triple-real contribution to the NLO quark beam function due to the
splitting of a quark into a virtual quark and three collinear gluons, . This provides an important ingredient for the calculation of the
leading-color contribution to the quark beam function at NLO.Comment: 31 pages, 2 figures; published version, updated ancillary file
(accessible through url in the section "Results"
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