29 research outputs found
Topology of Hadronic Flows for Higgs Production at Hadron Colliders
Hadronic radiation provides a tool to distinguish different topologies of
colour flow in hard scattering processes. We study the structure of hadronic
flow corresponding to Higgs production and decay in high-energy hadron-hadron
collisions. In particular, the signal gg -> H -> b anti-b and background gg ->
b anti-b processes are shown to have very different radiation patterns, and
this may provide an useful additional method for distinguishing Higgs signal
events from the QCD background.Comment: 24 pages, 13 figures, uses epsfig.sty. High resolution pictures may
be obtained via email from [email protected]
Costituent Quark Picture out of QCD in two dimensions - on the Light-Cone
Using DLCQ as a nonperturbative method, we test Fock-space truncations in
by studying the mass spectra of hadrons in colour SU(2) and
SU(3) at finite harmonic resolution . We include states
for mesons and up to states for baryons. With this truncation, we
give `predictions' for the masses of the first five states where finite
effects are minimal.Comment: 13 pages, uses elsart.sty 2 Postscript figures, uses epsf.sty
'elsart.sty' and 'elsart12.sty' are available via anonymous-ftp at
ftp://ftp.tex.ac.uk/tex-archive/macros/latex/contrib/supported/elsevie
Diffractive Higgs Production at the LHC
We use diffractive parton distributions obtained from fits to the diffractive
structure function measured at HERA to predict cross sections for single
diffractive Higgs production at the LHC. The dominant background processes are
also considered. Although some 5% - 15% of Higgs events are predicted to be
diffractive in this model, the ratio of signal to background is not
significantly improved.Comment: 14 pages, LaTeX, incl. 6 postscript figures, uses epsf.st
Weak Boson Production Amplitude Zeros; Equalities of the Helicity Amplitudes
We investigate the radiation amplitude zeros exhibited by many Standard Model
amplitudes for triple weak gauge boson production processes. We show that
production amplitudes have especially rich structure in terms of
zeros, these amplitudes have zeros originating from several different sources.
It is also shown that TYPE I current null zone is the special case of the
equality of the specific helicity amplitudes.Comment: 27 pages, 12 figures, 2 table
Higgs boson production via Double Pomeron Exchange at the LHC
We study Higgs boson production via Double Pomeron Exchange allowing for the
presence of Pomeron remnants. We estimate the number of events produced at the
LHC collider, as a function of the Higgs boson mass and its decay channel. The
model which successfully describes the high mass dijet spectrum observed at
Tevatron (run I) is used to predict rates of events with tagged protons for the
acceptance range of the CMS/Totem experiments. Sizeable cross-sections and
encouraging event selection signals are found, demonstrating especially for
smaller Higgs boson masses the importance to study the diffractive channels.
Tagging of the Pomeron remnants can be exploited to achieve a good resolution
on the Higgs boson mass for inclusive diffractive events, by optimizing an
intermediary analysis between higher cross-sections of the fully {\it
inclusive} mode (all Pomeron remnants) and cleaner signals of the {\it
exclusive} mode (without Pomeron remnants).Comment: 6 pages, 4 eps.figure
Hadronic Antenna Patterns as a Probe of Leptoquark Production at HERA
Hadronic antenna patterns can provide a valuable diagnostic tool for probing
the origin of the apparent excess of high events at HERA. We present
quantitative predictions for the distributions of soft particles and jets in
standard deep inelastic scattering events and in events
corresponding to the production of a narrow colour-triplet scalar
(`leptoquark') resonance. The corresponding distributions of soft photon
radiation, which are sensitive to the leptoquark electric charge, are also
presented. The distribution for one particular leptoquark assignment is shown
to contain a radiation zero.Comment: 16 pages, LaTeX, incl. 6 postscript figures, uses epsfig.sty. (High
resolution pictures may be obtained via email.
Convergence of Discretized Light Cone Quantization in the small mass limit
I discuss the slow convergence of Discretized Light Cone Quantization (DLCQ)
in the small mass limit and suggest a solution.Comment: 8 pages, 5 Postscript figures, uses boxedeps.te
Diffractive Higgs boson production at the Tevatron and LHC
Improved possibilities to find the Higgs boson in diffractive events, having
less hadronic activity, depend on whether the cross section is large enough.
Based on the soft color interaction models that successfully describe
diffractive hard scattering at HERA and the Tevatron, we find that only a few
diffractive Higgs events may be produced at the Tevatron, but we predict a
substantial rate at the LHC.Comment: 4 pages, 4 figures, uses Revtex