9 research outputs found
Isolating Vector Boson Scattering at the LHC: gauge cancellations and the Equivalent Vector Boson Approximation vs complete calculations
We have studied the possibility of extracting the signal
using the process as a test case. We have investigated
numerically the strong gauge cancellations between signal and irreducible
background, analysing critically the reliability of the Equivalent Vector Boson
Approximation which is commonly used to define the signal. Complete matrix
elements are necessary to study Electro--Weak Symmetry Breaking effects at high
invariant mass.Comment: Final version published in PR
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.
PHANTOM: a Monte Carlo event generator for six parton final states at high energy colliders
PHANTOM is a tree level Monte Carlo for six parton final states at
proton--proton, proton--antiproton and electron--positron collider at
O(alpha_ew^6) and O(alpha_ew^4*alpha_s^2) including possible interferences
between the two sets of diagrams. This comprehends all purely electroweak
contribution as well as all contributions with one virtual or two external
gluons. It can generate unweighted events for any set of processes and it is
interfaced to parton shower and hadronization packages via the last Les Houches
Accord protocol. It can be used to analyze the physics of boson boson
scattering, Higgs boson production in boson boson fusion, t-tbar and three
boson production.Comment: Version updated to agree with published one in Comp.Phys.Com