12,848 research outputs found
Higgs boson decays into {\gamma}{\gamma} and Z{\gamma} in the MSSM and BLSSM
We calculate Higgs decay rates into {\gamma}{\gamma} and Z{\gamma} in the
Minimal Supersymmetric Standard Model (MSSM) and (B-L) Supersymmetric Standard
Model (BLSSM) by allowing for contributions from light staus and charginos. We
show that sizable departures are possible from the SM predictions for the 125
GeV state and that they are testable during run 2 at the Large Hadron Collider.
Furthermore, we illustrate how a second light scalar Higgs signal in either or
both these decay modes can be accessed at the CERN machine rather promptly
within the BLSSM, a possibility instead precluded to the MSSM owing to the much
larger mass of its heavy scalar state.Comment: Plots slightly modified, no significant chang
A chemical evolution model for galaxy clusters
We develop a toy-model for the chemical evolution of the intracluster medium,
polluted by the galactic winds from elliptical galaxies. The model follows the
"galaxy formation history" of cluster galaxies, constrained by the observed
luminosity function.Comment: 6 pages, 10 figures, to appear in the Proceedings of the Workshop
"Chemical Enrichment of Intracluster and Intergalactic Medium", Vulcano,
Italy, 14-18 May 2001, ASP Conference Serie
Dependence of the leptonic decays of H^- on the neutrino mixing angles theta_{13} and theta_{23} in models with neutrinophilic charged scalars
In the Higgs Triplet Model and the neutrinophilic Two-Higgs-Doublet Model the
observed neutrinos obtain mass from a vacuum expectation value which is much
smaller than the vacuum expectation value of the Higgs boson in the Standard
Model. Both models contain a singly charged Higgs boson (H^-) whose Yukawa
coupling is directly related to the neutrino mass (i.e. a "neutrinophilic
charged Higgs"). The partial decay widths of H^- into a charged lepton and a
neutrino (H^- to l^- nu) depend identically on the neutrino masses and mixings
in the two models. We quantify the impact of the recent measurement of
sin^2(2theta_{13}), which plays a crucial role in determining the magnitude of
the branching ratio of H^- to e^- nu for the case of a normal neutrino mass
ordering if the lightest neutrino mass m_0 < 10^{-3} eV. We also discuss the
sizeable dependence of H^- to mu^- nu and H^- to tau^- nu on sin^2(theta_{23}),
which would enable information to be obtained on sin^2(theta_{23}) and the sign
of \Delta m^2_{31} if these decays are measured. Such information would help
neutrino oscillation experiments to determine the CP-violating phase \delta.Comment: 17 pages, 6 figure
Light charged Higgs boson with dominant decay to quarks and its search at LHC and future colliders
The possibility of a light charged Higgs boson that decays
predominantly to quarks ( and/or ) and with a mass in the range 80 GeV
GeV is studied in the context of Three-Higgs-Doublet
Models (3HDMs). At present the Large Hadron Collider (LHC) has little
sensitivity to this scenario, and currently the best constraints are from LEP2
and Tevatron searches. The branching ratio of can be dominant in
two of the five types of 3HDM, and we determine the parameter space where this
occurs. The decay has recently been searched for at the LHC for
the first time, and with increased integrated luminosity one would expect
sensitivity to the region 80 GeV GeV due to the smaller
backgrounds with respect to decays.Comment: 25 pages, 17 figure
Green public procurement criteria for road infrastructures: State of the art and proposal of a weighted sum multicriteria analysis to assessenvironmental impacts
In the last years, the attention to environmental issue is growing, demonstrating the interest to protect the nature and to better use the non-renewable resources. At international level, and especially in the European Community, for different trades, a wide production of voluntary documents and institutional acts proves the interest and the need for a green economy. An innovative approach may lead to the experience of Green Public Procurements (GPP), to protect the environment as a public interest and to promote technological developments. So far, the experiences of GPP are limited, not entirely positive and in the field of road infrastructures almost entirely absent. Construction and maintenance of road infrastructures is objectively more complex than purchasing goods or services. The paper proposes the integration of the weighted sum multi-criteria analysis into existing procedures. The methodology needs for environmental labels related to materials, machines and works which contribute to the final product "road". The labels are recognized at international level and consistent with procedures, conditions and criteria currently published in road tenders, therefore the approach can be followed to pursue the environmental sustainability of road infrastructures without compromising the economic attention
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