9 research outputs found
QCD resummation in the framework of supersymmetry
Motivated by current searches for electroweak superpartners at the Large
Hadron Collider, we present precision predictions for pair production of such
particles in the framework of the Minimal Supersymmetric Standard Model. We
make use of various QCD resummation formalisms and match the results to pure
perturbative QCD computations. We study the impact of scale variations and
compare our results to predictions obtained by means of traditionally used
Monte Carlo event generators.Comment: 4 pages, 2 figures, contribution to the proceedings of Moriond QCD
201
Revisiting slepton pair production at the Large Hadron Collider
Motivated by the shift in experimental attention towards electroweak
supersymmetric particle production at the CERN LHC, we update in this paper our
precision predictions at next-to-leading order of perturbative QCD matched to
resummation at the next-to-leading logarithmic accuracy for direct slepton pair
production in proton-proton collisions. Simplified models, now commonly adopted
by the experimental collaborations for selectrons and smuons as well as mixing
staus, are used as benchmarks for total cross sections at achieved and future
center-of-mass energies. They are presented together with the corresponding
scale and parton density uncertainties in graphical and tabular form for future
reference. Using modern Monte Carlo techniques, we also reanalyze recent ATLAS
and CMS slepton searches in light of our precision cross sections and for
various assumptions on the decomposition of the sleptons and their neutralino
decay products.Comment: 32 pages, 10 figures, 4 tables; version accepted by JHE
QCD RESUMMATION IN THE FRAMEWORK OF SUPERSYMMETRY
Motivated by current searches for electroweak superpartners at the Large Hadron Collider, we present precision predictions for pair production of such particles in the framework of the Minimal Supersymmetric Standard Model. We make use of various QCD resummation formalisms and match the results to pure perturbative QCD computations. We study the impact of scale variations and compare our results to predictions obtained by means of traditionally used Monte Carlo event generators
Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV
Motivated by hints for a light Standard Model-like Higgs boson and a shift in
experimental attention towards electroweak supersymmetry particle production at
the CERN LHC, we update in this paper our precision predictions at
next-to-leading order of perturbative QCD matched to resummation at the
next-to-leading logarithmic accuracy for direct gaugino pair production in
proton-proton collisions with a center-of-mass energy of 8 TeV. Tables of total
cross sections are presented together with the corresponding scale and parton
density uncertainties for benchmark points adopted recently by the experimental
collaborations, and figures are presented for up-to-date model lines attached
to them. Since the experimental analyses are currently obtained with parton
showers matched to multi-parton matrix elements, we also analyze the precision
of this procedure by comparing invariant-mass and transverse-momentum
distributions obtained in this way to those obtained with threshold and
transverse-momentum resummation.Comment: 28 pages, 7 figures, 9 tables; version to appear in JHE
Precision predictions for electroweak superpartner production at hadron colliders with Resummino
Precision predictions for electroweak superpartner production at hadron colliders with Resummino
We describe the Resummino package, a C++ and Fortran program dedicated to
precision calculations in the framework of gaugino and slepton pair production
at hadron colliders. This code allows to calculate transverse-momentum and
invariant-mass distributions as well as total cross sections by combining the
next-to-leading order predictions obtained by means of perturbative QCD with
the resummation of the large logarithmic contributions arising in the small
transverse-momentum region and close to the production threshold. The results
computed in this way benefit from reduced theoretical uncertainties, compared
to a pure next-to-leading order approach as currently employed in the
experimental analyses searching for sleptons and gauginos at hadron colliders.
This is illustrated by using of Resummino in the context of a typical
supersymmetric benchmark point dedicated to superpartner searches at the Large
Hadron Collider.Comment: 9 pages, 1 figure, 1 table; version accepted by EPJC; program to be
downloaded from http://www.resummino.or