The possibility of a light charged Higgs boson H ± that decays predominantly to quarks (cs and/or cb) and with a mass in the range 80 GeV ≤ m H ± ≤ 90 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 H ± → cb can be dominant in two of the five types of 3HDM, and we determine the parameter space where this occurs. The decay H ± → cb 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 ≤ m H ± ≤ 90 GeV due to the smaller backgrounds with respect to H ± → cs decays. * Electronic address: a.g.akeroyd@soton.ac.uk † Electronic address: S.Moretti@soton.ac.uk ‡ Electronic address: ms32g13@soton.ac.uk arXiv:1810.05403v1 [hep-ph]
We demonstrate a new type of cancellation of contributions to the electron and neutron electric dipole moments (EDMs) that occurs in three Higgs doublet models (3HDMs) when CP violation appears in the charged Higgs sector. The cancellation becomes exact when the two physical charged Higgs bosons in the model are degenerate in mass. Depending on the model parameters, degeneracies at the 10% level are however sufficient to evade current bounds on the electron and neutron EDMs. We demonstrate that viable parameter space remains with both charged Higgs bosons lighter than 500 GeV and large CP-violating phases while also satisfying theoretical constraints from perturbativity and experimental ones from $$ \overline{B} $$
B
¯
→ Xsγ and direct searches.
The possibility of a light charged Higgs boson H ± that decays predominantly to cb and with a mass in the range 80 GeV ≤ M H ± ≤ 90 GeV is studied in the context of a 3-Higgs Doublet Model (3HDM). Searches for this decay at the Large Hadron Collider (LHC) do not have sensitivity to this mass region at present. It is shown that the searches for H ± at LEP2 could be supplemented by either one or two b-tags, which would enable such large branching ratios for H ± → cb to be probed in the above mass region. We comment on the possibility of this 3HDM scenario to explain a slight excess in the searches for H ± at LEP2, which is best fit by M H ± of around 90 GeV, and discuss the prospects for detecting H ± → cb decays at future e + e − colliders. * Electronic address: a.g.akeroyd@soton.ac.uk † Electronic address: S.Moretti@soton.ac.uk ‡ Electronic address: ms32g13@soton.ac.uk
Searches for a charged Higgs boson ($H^\pm$) decaying to a charm quark and a bottom quark ($H^\pm \to cb$) have been carried out at the Large Hadron Collider (LHC) in the decay of top quarks ($t\to H^\pm b$). In a recent search by the ATLAS collaboration (with all Run II data, 139 fb$^{-1}$) a local excess of around $3\sigma$ has been observed, which is best fitted by a charged Higgs boson with a mass ($m_{H^\pm}$) of around 130 GeV and a product of branching ratios (BRs) given by BR$(t\to H^\pm b)\times{\rm BR}(H^\pm\to cb)=0.16\%\pm 0.06\%$. In the context of Two-Higgs-Doublet Models (2HDM) with independent Yukawa couplings for $H^\pm$ we present the parameter space for which this excess (assuming it to be genuine) can be accommodated, taking into account the limits from LHC searches for $H^\pm\to cs$ and $H^\pm\to \tau\nu$ at $m_{H^\pm}$=130 GeV and the constraint from $b\to s\gamma$. It is then shown that such an excess cannot be explained in 2HDMs with natural flavour conservation, but can be accommodated in the flipped Three-Higgs-Doublet Model (3HDM) and in the aligned 2HDM (A2HDM). Upcoming searches with 139 fb$^{-1}$ in the channels $H^\pm\to cb$ (CMS), $H^\pm \to cs$ (ATLAS/CMS) and $H^\pm \to \tau\nu$ (ATLAS/CMS) will determine if the excess is the first sign of an $H^\pm$ with $m_{H^\pm}=130$ GeV.
To improve the multi-path and multi-field exploitation of phosphogypsum (PG), a polymer modified bentonite-sand-phosphogypsum mixture is developed for application in anti-seepage of PG slag fields and roadbeds. In this research, the SEM tests, FSI tests, and hydraulic conductivity tests under different conditions are carried out. The PMB has a superior swell index (72 ml/2g) in water, but the PMB-S-PG0.5 mixture’s swell index is low (5.8 ml/2g) in water because the acidic PG. The SEM tests reveal that the PMB-S-PG0.5 mixture forms a dense honeycomb structure which can complicate the seepage channels and maintain the low hydraulic conductivity. Thus, the swell index is not an accurate indicator to hydraulic conductivity. The honeycomb structure in the PMB-S-PG0.5 mixture has elasticity, strength, and isotropy; it can effectively resist the effects of DW and FT cycles. During the DW cycles. The PMB-S-PG0.5 mixture has lower degree of crack development, superior crack self-healing properties and more tortuous seepage channels, resulting in lower hydraulic conductivity (4.14×10− 10 m/s) compared to the RB-S-PG0.5 mixture (6.90×10− 9 m/s) after 9 DW cycles. Due to the finer particles, the lower number of ice lenses, and the more seepage channels in PMB-S-PG0.5 mixture, the degree of ice nucleation in the PMB-S-PG0.5 mixture is lower than in the RB-S-PG0.5 mixture during the FT cycles. The PMB-S-PG0.5 mixture’s hydraulic conductivity was lower (9.72×10− 11 m/s) compared to the RB-S-PG0.5 mixture (3.26×10− 9 m/s) after 9 FT cycles. That is, the PMB-S-PG0.5 mixture is expected to be widely used to enable the resource reuse of PG.
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