5,304 research outputs found
Charged Higgs-boson pair production in association with the boson at electron-positron colliders
In this paper, the production of the charged Higgs pair associated with the
boson is analyzed in the minimal extension of the standard model the
so-called two-Higgs-doublet model (2HDM). The process is calculated at the tree level including all the possible diagrams
in 2HDM. The numerical analysis is performed in consideration of the current
experimental constraints and various scenarios for the free parameters of the
model. The results are presented as a function of center-of-mass energy, the
charged Higgs mass (), and the ratio of the vacuum expectation
values (). The unpolarized cross section, taking into account the
results in the flavor physics, gets up to for
, and it declines with decreasing in
Type-I. However, it gets down to for in Type-II. Further, the calculation is also carried out in the
non-alignment scenario and low- scenario. The effect of the polarized
incoming and beams shows that the cross section is enhanced by a
factor up to 2.5 at P(+0.60,-0.80) polarization configuration. Decay channels
of the charged Higgs, possible final states of the process, and some
differential distributions belong to the charged Higgs and boson are
examined for each scenario. The analysis shows that some channels have higher
branching ratio such as , ,
and . These decay channels are essential for the charged
Higgs searches in the lepton colliders regarding the scenarios interested. The
detection of the charged Higgs is a powerful sign for the extended scalar
sectors, and the results show the potential of a future lepton collider.Comment: 29 pages, 12 figure
Neutralino Pair Production at the Photon-Photon Collider for the -Coannihilation Scenario
Supersymmetry (SUSY) is a theory that gives an explanation for the strong and
electroweak interactions from the grand unification scale down to the weak
scale. The search for supersymmetric particles still continues at full speed at
the LHC without success. The main tasks at the ILC is complementing the LHC
result and also search for new physics. In this study, the neutralino pair
production via photon-photon collision is studied for the
-coannihilation scenario in the context of MSSM at the ILC. In the
calculation, all the possible one-loop diagrams are taken into account for the
photon-photon interaction. We present the production cross section and
distribution of various observables for the lightest and next-to-lightest
neutralino pairs for benchmark models which are specifically presented in the
light of LHC8 data analysis, employing these benchmark models for neutralino
pair production could show the potential of the ILC concerning the dark matter
searches in supersymmetry.Comment: 5 pages, 4 figure
Localization of compactness of Hankel operators on pseudoconvex domains
We prove the following localization for compactness of Hankel operators on
Bergman spaces. Assume that D is a bounded pseudoconvex domain in C^n, p is a
boundary point of D and B(p,r) is a ball centered at p with radius r so that
U=D\cap B(p,r) is connected. We show that if the Hankel operator H^D_f is
compact on A^2(D) (the symbols f is C^1 on the closure of D) then H^U_f is
compact on A^2(U) where A^2(D) and A^2(U) denote the Bergman spaces on D and U,
respectively.Comment: 9 pages. To appear in Illinois J. Mat
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