7,272 research outputs found
Electroweak Corrections
The test of the electroweak corrections has played a major role in providing
evidence for the gauge and the Higgs sectors of the Standard Model. At the same
time the consideration of the electroweak corrections has given significant
indirect information on the masses of the top and the Higgs boson before their
discoveries and important orientation/constraints on the searches for new
physics, still highly valuable in the present situation.The progression of
these contributions is reviewed.Comment: 14 pages, 3 figures, a contribution to "The Standard Theory up to the
Higgs discovery - 60 years of CERN
Supersymmetric Electroweak Corrections to Single Top Quark Production at the Fermilab Tevatron
We have calculated the supersymmetric
electroweak corrections to single top quark production via at the Fermilab Tevatron in the minimal supersymmetric model. The
supersymmetric electroweak corrections to the cross section are a few percent
for , and can exceed 10% for . The combined effects
of SUSY electroweak corrections and the Yukawa corrections can exceed 10% for
favorable parameter values, which might be observable at a high-luminosity
Tevatron.Comment: 13 pages, 4 figures available at reques
NLO electroweak corrections to off-shell top-antitop production with leptonic decays at the LHC
For the first time the next-to-leading-order electroweak corrections to the
full off-shell production of two top quarks that decay leptonically are
presented. This calculation includes all off-shell, non-resonant, and
interference effects for the 6-particle phase space. While the electroweak
corrections are below one per cent for the integrated cross section, they reach
up to 15% in the high-transverse-momentum region of distributions. To support
the results of the complete one-loop calculation, we have in addition evaluated
the electroweak corrections in two different pole approximations, one requiring
two on-shell top quarks and one featuring two on-shell W bosons. While the
former deviates by up to 10% from the full calculation for certain
distributions, the latter provides a very good description for most
observables. The increased centre-of-mass energy of the LHC makes the inclusion
of electroweak corrections extremely relevant as they are particularly large in
the Sudakov regime where new physics is expected to be probed.Comment: 33 pages,23 eps-figures. Matches the published version. Typo fixed in
equations (2.18) and (2.19
Combining QCD and electroweak corrections to dilepton production in FEWZ
We combine the next-to-next-to-leading order (NNLO) QCD corrections to
lepton-pair production through the Drell-Yan mechanism with the next-to-leading
order (NLO) electroweak corrections within the framework of the FEWZ simulation
code. Control over both sources of higher-order contributions is necessary for
measurements where percent-level theoretical predictions are crucial, and in
phase-space regions where the NLO electroweak corrections grow large. The
inclusion of both corrections in a single simulation code eliminates the need
to separately incorporate such effects as final-state radiation and electroweak
Sudakov logarithms when comparing many experimental results to theory. We
recalculate the NLO electroweak corrections in the complex-mass scheme for both
massless and massive final-state leptons, and modify the QCD corrections in the
original FEWZ code to maintain consistency with the complex-mass scheme to the
lowest order. We present phenomenological results for LHC studies that include
both NNLO QCD and NLO electroweak corrections. In addition, we study several
interesting kinematics features induced by experimental cuts in the
distribution of photon radiation at the LHC.Comment: 21 pages, 13 figure
NLO corrections to WWZ and ZZZ production at the ILC
We calculate the full one-loop electroweak corrections to tri-boson
production (ZZZ and WWZ) at the ILC. This is important to understand the
Standard Model (SM) gauge quartic couplings which can be a window on the
mechanism of spontaneous symmetry breaking. We find that even after subtracting
the leading QED corrections, the electroweak corrections can still be large
especially as the energy increases.Comment: 7 pages, proceedings of the 3rd CPP Workshop, September 23-25, 2010,
KEK Tsukuba Japa
Electroweak Corrections at High Energies
We present a survey of the most abundant processes at the LHC for sensitivity
to electroweak corrections at \sqrt{s} = 8, 14, 33, and 100 TeV proton-proton
collision energies. The processes studied are pp -> dijet, inclusive W and Z,
W/Z+jets, and WW. In each case we compare the experimental uncertainty in the
highest kinematic regions of interest with the relative magnitude of
electroweak corrections and fixed-order \alpha_S calculations.Comment: Contribution to the Snowmass-2013 report of the QCD Working Group. 15
pages, 14 figures, 5 tables. Version 2: Added a new section 4A and updated
the author list, acknowledgements, and references. Version 3: Added a new
reference Ref.[36
Nonfactorizable QCD and Electroweak Corrections to the Hadronic Z Boson Decay Rate
We present an analysis of two-loop mixed QCD and electroweak corrections to
the decay of the Z boson into light quarks. We find that the naive
factorization of QCD and electroweak corrections does not describe correctly
the two-loop effects. The nonfactorizable corrections shift the width of the Z
boson by approximately -0.55(3) MeV and increase the central value of the
strong coupling constant determined at LEP by 0.001.Comment: 9 pages, Revte
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