886 research outputs found
Boson Fusion and Higgs production at the LHC in six fermion final states with one charged lepton pair
Boson boson scattering and Higgs production in boson boson fusion will be
actively investigated at the LHC. We have performed a parton level study of all
processes of the type using for the first
time a full fledged six fermion Monte Carlo event generator which employs exact
matrix elements at \O(\alpha_{em}^6). We have examined Higgs production in
vector boson fusion followed by the decay chain ,
including exactly all electroweak irreducible backgrounds. In the high mass
region we have compared the case of a relatively light Higgs with the no-Higgs
case. The integrated cross section for the latter case is more than twice that
in the former for a minimum invariant mass of the pair of about 800 \GeV.
We find, in a preliminary anlysis at parton level that, summing up the muon and
the electron channels, about 30 events are expected in the light Higgs case for
L=100 .Comment: Final version published in Phys.Rev.
PHASE - An event generator for six fermion physics at the LHC
PHASE is a Monte Carlo event generator, under construction, for all Standard
Model processes with six fermions in the final state at the LHC. It employs the
full set of tree level Feynman diagrams, taking into account fermion masses for
b quarks. The program can generate unweighted events for any subset of all six
fermion final states in a single run, by making use of dedicated pre-samples.
An interface to hadronization is provided.Comment: 4 pages, Latex, 1 figure. Talk given by E. Accomando at the IX
International Workshop on Advanced Computing and Analysis Techniques in
Physics Research (ACAT03), KEK, Tsukuba, December 1-5, 200
Precision Measurements of the W-Boson Mass
The Standard Model of electroweak interactions has had great success in
describing the observed data over the last three decades. The precision of
experimental measurements affords tests of the Standard Model at the quantum
loop level beyond leading order. Despite this great success it is important to
continue confronting experimental measurements with the Standard Model
predictions as any deviation would signal new physics. As a fundamental
parameter of the Standard Model, the mass of the W-boson, M_W, is of particular
importance. Aside from being an important test of the SM itself, a precision
measurement of M_W can be used to constrain the mass of the Higgs boson, M_H.
In this article we review the principal experimental techniques for determining
M_W and discuss their combination into a single precision M_W measurement,
which is then used to yield constraints on M_H. We conclude by briefly
discussing future prospects for precision measurements of the W-boson mass.Comment: 37 pages, 13 figures, LaTex, to be published in volume 50 of Annual
Review of Nuclear and Particle Scienc
Exploring alternative symmetry breaking mechanisms at the LHC with 7, 8 and 10 TeV total energy
In view of the annnouncement that in 2012 the LHC will run at 8 TeV, we study
the possibility of detecting signals of alternative mechanisms of ElectroWeak
Symmetry Breaking, described phenomenologically by unitarized models, at
energies lower than 14 TeV. A complete calculation with six fermions in the
final state is performed using the PHANTOM event generator. Our results
indicate that at 8 TeV some of the scenarios with TeV scale resonances are
likely to be identified while models with no resonances or with very heavy ones
will be inaccessible, unless the available luminosity will be much higher than
expected
Prompt photon pair production in association with top-antitop pairs. An important background to intermediate mass Higgs detection
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