19,910 research outputs found
Diffractive Higgs boson photoproduction in peripheral collisions
An alternative process is proposed for the diffractive Higgs boson production
in peripheral collisions, exploring it through the photon-proton
interaction by Double Pomeron Exchange. It is estimated the event rate of the
diffractive Higgs production in central rapidity for Tevatron and LHC energies,
being of the order of 1 fb, in agreement to the predictions from other
diffractive processes. The results are confronted with those obtained from a
similar approach of the Durham group.Comment: 4 pages, 7 figures, contribution to the proceedings of II Latin
American Workshop on High Energy Physics [IILAWHEP], 3-7 Dec. 2007, Sao
Miguel das Missoes, Brazi
Single and Central Diffractive Higgs Production at the LHC
The single and central diffractive production of the Standard Model Higgs
boson is computed using the diffractive factorization formalism, taking into
account a parametrization for the Pomeron structure function provided by the H1
Collaboration. We compute the cross sections at NLO accuracy for the gluon
fusion process, since it is the leading mechanism for the Higgs boson
production. The gap survival probability is also introduced to include the
rescattering corrections due to spectator particles present in the interaction.
The diffractive ratios are predicted for proton-proton collisions at the LHC,
since the beam luminosity is favorable to the Higgs boson detection. These
results provide updated estimations for the fraction of single and central
diffractive events in the LHC kinematical regime.Comment: To appear in the proceedings of Diffraction 2010: International
Workshop on Diffraction in High Energy Physics, Otranto, Italy, 10-15 Sep
201
Assessment of seismic performance of adobe structures in Pakistan and Portugal
Adobe buildings exist in different parts of the world. The construction of these buildings can be carried out
economically, using locally available materials and skills that do not require use of modern machinery.
Therefore, adobe buildings provide an economic housing option. The construction of adobe structures is carried
out based on traditional construction practices which vary from region to region. This paper presents the results
of a study which was conducted to study the construction practices of adobe buildings in Pakistan and Portugal
in the context of their seismic vulnerability. The adobe buildings in both these countries were found to be
subjected to seismic hazard levels which, although is low in some regions, may cause significant damages. Lack of essential elements or details for the adequate seismic performance was found in the adobe buildings in both regions
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