4,105 research outputs found
Threshold scans in diffractive W pair production via QED processes at the LHC
We propose a new set of measurements which can be performed at the LHC using
roman pot detectors. This new method is based on exploiting excitation curves
to measure kinematical properties of produced particles. We illustrate it in
the case of central diffractive W pair production.Comment: Accepted by Phys. Lett. B - 1 reference adde
Sensitivity to the Standard Model Higgs Boson in Exclusive Double Diffraction
We use a Monte Carlo implementation of recently developed models of double
diffraction to assess the sensitivity of the LHC experiments to Standard Model
Higgs bosons produced in exclusive double diffraction. The signal is difficult
to extract, due to experimental limitations related to the first level trigger,
and to contamination by inclusive double diffractive background. Assuming the
above difficulties can be overcome, the expected signal-to-background ratio is
presented as a function of the experimental resolution on the missing mass.
Injecting a missing mass resolution of 2 GeV, a signal-to-background ratio of
about 0.5 is obtained; a resolution of 1 GeV brings a signal to background
ratio of 1. This result is lower than previous estimates, and the discrepancy
is explained.Comment: Revised versio
Diffractive Production at the Tevatron and the LHC
We present predictions for the diffractive production of mesons in the
central rapidity region usually covered by collider detectors. The predicted
cross sections are based on the Bialas-Landshoff formalism for both exclusive
and inclusive production and makes use of the DPEMC Monte-Carlo simulation
adapted with kinematics appropriate for small-mass diffractive production. We
compare generator-level results with a CDF measurement for exclusive
production, and study background and other scenarios including the contribution
of inclusive production. The results agree with the Tevatron data and
are extrapolated, highlighting the exclusive \chic production at LHC
energies. A possible new measurement at the Tevatron using the D{\O}forward
detectors is investigated, taking advantage of the dominance of exclusive
production for high enough diffractive mass fraction.Comment: 9 pages, 2 figures, added akcnowledgment
Threshold scans in Central Diffraction at the LHC
We propose a new set of measurements which can be performed at the LHC using
roman pot detectors. The method exploits excitation curves in central
diffractive pair production, and is illustrated using the examples of the W
boson and top quark mass measurements. Further applications are mentioned.Comment: 11 page
Popping out the Higgs boson off vacuum at Tevatron and LHC
In the prospect of diffractive Higgs production at the LHC collider, we give
an extensive study of Higgs boson, dijet, diphoton and dilepton production at
hadronic colliders via diffraction at both hadron vertices. Our model, based on
non factorizable Pomeron exchange, describes well the observed dijet rate
observed at Tevatron Run I. Taking the absolute normalization from data, our
predictions are given for diffractive processes at Tevatron and LHC. Stringent
tests of our model and of its parameters using data being taken now at Tevatron
Run II are suggested. These measurements will also allow to discriminate
between various models and finally to give precise predictions on diffractive
Higgs boson production cross-section at the LHC.Comment: 27 pages, 16 figures. Published version, incorporating corrections
listed in the Erratum to appea
Interpretation of the searches for Higgs bosons in the MSSM with an additional scalar singlet
DPEMC : A Monte-Carlo for Double Diffraction
We extend the POMWIG Monte Carlo generator developed by B.Cox and J.Forshaw,
to include new models of central production through inclusive and exclusive
Double Pomeron Exchange in proton-proton collisions. Double photon Exchange
processes are described as well, both in proton-proton and heavy-ion
collisions. In all contexts, various models have been implemented, allowing for
comparisons and uncertainty evaluation and enabling detailed experimental
simulations.Comment: Revised versio
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
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