1,509 research outputs found
Radiative corrections to e+e- --> WW --> 4f with RACOONWW
RACOONWW is the first Monte Carlo generator for e+e- --> WW --> 4f(+gamma)
that includes the electroweak O(alpha) radiative corrections in the double-pole
approximation completely. Some numerical results for LEP2 energies are
discussed, and the predictions for the total W-pair cross section are
confronted with LEP2 data.Comment: 7 pages, latex, 5 postscript files, to appear in the Proceedings of
the 5th Zeuthen Workshop on Elementary Particle Theory ``Loops and Legs in
Quantum Field Theory'', Bastei/Koenigstein, Germany, April 9-14, 200
Four-fermion production with RACOONWW
RACOONWW is an event generator for e+e- --> WW --> 4fermions(+gamma) that
includes full tree-level predictions for e+e- --> 4f and e+e- --> 4f+gamma as
well as O(alpha) corrections to e+e- --> 4f in the so-called double-pole
approximation. We briefly sketch the concept of the calculation on which this
generator is based and present some numerical results.Comment: 9 pages, latex, 6 postscript files, to appear in the proceedings of
the UK Phenomenology Workshop on Collider Physics, Durham, UK, 19-24
September, 199
RacoonWW1.3: A Monte Carlo program for four-fermion production at e^+ e^- colliders
We present the Monte Carlo generator RacoonWW that computes cross sections to
all processes e^+ e^- -> 4f and e^+ e^- -> 4f + gamma and calculates the
complete O(alpha) electroweak radiative corrections to e^+ e^- -> W W -> 4f in
the electroweak Standard Model in double-pole approximation. The calculation of
the tree-level processes e^+ e^- -> 4f and e^+ e^- -> 4f + gamma is based on
the full matrix elements for massless (polarized) fermions. When calculating
radiative corrections to e^+ e^- -> W W -> 4f the complete virtual
doubly-resonant electroweak corrections are included, i.e. the factorizable and
non-factorizable virtual corrections in double-pole approximation, and the real
corrections are based on the full matrix elements for e^+ e^- -> 4f + gamma.
The matching of soft and collinear singularities between virtual and real
corrections is done alternatively in two different ways, namely by using a
subtraction method or by applying phase-space slicing. Higher-order
initial-state photon radiation and naive QCD corrections are taken into
account. RacoonWW also provides anomalous triple gauge-boson couplings for all
processes e^+ e^- -> 4f and anomalous quartic gauge-boson couplings for all
processes e^+ e^- -> 4f + gamma.Comment: 62 pages, LaTeX, elsart styl
Electroweak Radiative Corrections to Off-Shell W-Pair Production
We briefly describe the RacoonWW approach to calculate radiative corrections
to e+ e- -> W W -> 4 fermions and present numerical results for the total
W-pair production cross section at LEP2.Comment: 3 pages, 2 figures, talk given at the DPF2000 meeting, Columbus, OH,
August 9-12, 200
Probing anomalous quartic gauge-boson couplings via e+e- --> 4fermions+gamma
All lowest-order amplitudes for e+e- --> 4f+gamma are calculated including
five anomalous quartic gauge-boson couplings that are allowed by
electromagnetic gauge invariance and the custodial SU(2)_c symmetry. Three of
these anomalous couplings correspond to the operators L_0, L_c, and L_n that
have been constrained by the LEP collaborations in WWgamma production. The
anomalous couplings are incorporated in the Monte Carlo generator RACOONWW.
Moreover, for the processes e+e- --> 4f+gamma RACOONWW is improved upon
including leading universal electroweak corrections such as initial-state
radiation. The discussion of numerical results illustrates the size of the
leading corrections as well as the impact of the anomalous quartic couplings
for LEP2 energies and at 500GeV.Comment: 27 pages, latex, 42 postscript files, some misprints correcte
Electroweak radiative corrections to e+e- --> WW --> 4fermions in double-pole approximation -- the RACOONWW approach
We calculate the complete O(alpha) electroweak radiative corrections to e+e-
--> WW --> 4f in the electroweak Standard Model in the double-pole
approximation. We give analytical results for the non-factorizable virtual
corrections and express the factorizable virtual corrections in terms of the
known corrections to on-shell W-pair production and W decay. The calculation of
the bremsstrahlung corrections, i.e. the processes e+e- --> 4f+gamma in lowest
order, is based on the full matrix elements. The matching of soft and collinear
singularities between virtual and real corrections is done alternatively in two
different ways, namely by using a subtraction method and by applying
phase-space slicing. The O(alpha) corrections as well as higher-order
initial-state photon radiation are implemented in the Monte Carlo generator
RACOONWW. Numerical results of this program are presented for the
W-pair-production cross section, angular and W-invariant-mass distributions at
LEP2. We also discuss the intrinsic theoretical uncertainty of our approach.Comment: 51 pages, latex, 28 postscript file
W-pair production at future e+e- colliders: precise predictions from RACOONWW
We present numerical results for total cross sections and various
distributions for e+e- --> WW --> 4f(+gamma) at a future 500GeV linear
collider, obtained from the Monte Carlo generator RACOONWW. This generator is
the first one that includes O(alpha) electroweak radiative corrections in the
double-pole approximation completely. Owing to their large size the corrections
are of great phenomenological importance.Comment: 11 pages, latex, 10 postscript file
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