A
bstract
We perform comparative studies for four types of the two Higgs Doublet Models (2HDMs) under the precision measurements of the Standard Model (SM) Higgs observables at the proposed Higgs ...factories. We explore the discovery potential based on the hypothetical deviations in the precision data for the 2HDMs up to one-loop level. We find 5
σ
observability from the
χ
2
fitting in a significant theory parameter space at future Higgs factories. For the Type-I 2HDM, regions with cos(
β − α
) ≲
−
0
.
1 or cos(
β − α
) ≳ 0
.
08 are discoverable at more than 5
σ
level. For the other three types of 2HDMs, the 5
σ
region is even bigger: | cos(
β − α
)| ≳ 0
.
02 for tan
β ∼
1. At small and large values of tan
β
, the region in cos(
β − α
) is further tightened. We examine the extent to which the different 2HDM theories may be distinguishable from one to the other at the 95% Confidence Level with four benchmark points as case studies. We show that a large part of the parameter space of the other types of 2HDMs can be distinguished from the benchmark points of the target model. The impacts of loop corrections are found to be significant in certain parameter regions.
The present study, based on copolymerization of free radicals, makes hydroxyethyl cellulose react with acrylamide and acrylic acid to prepare a type of agglomeration-cementing dust suppressant with ...decent fluidity, agglomeration ability and water absorption capacity. Single-factor experiments are carried out to determine the optimal reaction conditions; the progress of the reaction was analyzed using FTIR and XRD; TG-DSC and SEM are used to further characterize the product; special experiments are designed to test the product’s viscosity, wettability mechanical properties, wind resistance and water resistance. The experimental results indicate that the newly developed agglomeration-cementing dust suppressant is favored due to the easiness to apply in the field and its decent ability to withstand wind and rain.
Graphical Abstract
A
bstract
The exotic decay modes of non-Standard Model Higgs bosons are efficient in probing the hierarchical Two Higgs Doublet Models (2HDM). In particular, the decay mode
H
±
→
HW
±
serves as a ...powerful channel in searching for charged Higgses. In this paper, we analyze the reach for
H
±
→
HW
±
→
t
t
¯
W
at a 100 TeV
pp
collider, and show that it extends the reach of the previously studied
ττW
final states once above the top threshold. Top tagging technique is used, in combination with a boosted decision tree classifier. At the low tan
β
region, almost the entire hierarchical Type-II 2HDM parameter space can be probed via the combination of all exotic decay channels.
Light Scalars at FASER Kling, Felix; Li, Shuailong; Song, Huayang ...
The journal of high energy physics,
1/8, Letnik:
2023, Številka:
8
Journal Article
Recenzirano
Odprti dostop
A
bstract
FASER, the ForwArd Search ExpeRiment, is a currently operating experiment at the Large Hadron Collider (LHC) that can detect light long-lived particles produced in the forward region of the ...LHC interacting point. In this paper, we study the prospect of detecting light CP-even and CP-odd scalars at FASER and FASER 2. Considering a model-independent framework describing the most general interactions between a CP-even or CP-odd scalar and SM particles using the notation of coupling modifiers in the effective Lagrangian, we develop the general formalism for the scalar production and decay. We then analyze the FASER and FASER 2 reaches of light scalars in the large tan
β
region of the Type-I two Higgs double model as a case study, in which light scalars with relatively long lifetime could be accommodated. In the two benchmark scenarios we considered, the light (pseudo)scalar decay length varies in (10
−8
, 10
5
) meters. Both FASER and FASER 2 can probe a large part of the parameter space in the large tan
β
region up to 10
7
, extending beyond the constraints of the other existing experiments.
Chiral bridged 2,2,1 bicyclic lactones are privileged structural units in pharmaceutics and bioactive nature products. However, the synthetic methods for these compounds are rare. Here we report an ...efficient method for enantioselective construction of bridged 2,2,1 bicyclic lactones bearing a quaternary stereocenter via Rh-catalyzed asymmetric hydroformylation/intramolecular cyclization/pyridium chlorochromate (PCC) oxidation. By employing a hybrid phosphine-phosphite chiral ligand, a series of cyclopent-3-en-1-ols are transformed into corresponding γ-hydroxyl aldehydes with specific syn-selectivity. Then, hemiacetals form in situ and oxidation with PCC in one-pot affords bridged 2,2,1 bicyclic lactones in high yields and excellent enantiomeric excess. Replacing the hydroxyl group by an ester group, cyclopentanecarbaldehydes with a chiral all-carbon quaternary stereocenter in the γ-position can be generated efficiently.
A
bstract
We explore the extent to which future precision measurements of the Standard Model (SM) observables at the proposed
Z
-factories and Higgs factories may have impacts on new physics beyond ...the Standard Model, as illustrated by studying the Type-I Two-Higgs-doublet model (Type-I 2HDM). We include the contributions from the heavy Higgs bosons at the tree-level and at the one-loop level in a full model-parameter space. While only small tan
β
region is strongly constrained at tree level, the large tan
β
region gets constrained at loop level due to tan
β
enhanced tri-Higgs couplings. We perform a multiple variable
χ
2
fit with non-alignment and non-degenerate masses. We find that the allowed parameter ranges could be tightly constrained by the future Higgs precision measurements, especially for small and large values of tan
β
. Indirect limits on the masses of heavy Higgs bosons can be obtained, which can be complementary to the direct searches of the heavy Higgs bosons at hadron colliders. We also find that the expected accuracies at the
Z
-pole and at a Higgs factory are quite complementary in constraining mass splittings of heavy Higgs bosons. The typical results are
|
cos(
β − α
)
| <
0
.
05
, |
∆
m
Φ
| <
200 GeV, and tan
β
≳ 0
.
3. The reaches from CEPC, Fcc-ee and ILC are also compared, for both Higgs and
Z
-pole precision measurements. Comparing to the Type-II 2HDM, the 95% C.L. allowed range of cos(
β − α
) is larger, especially for large values of tan
β
.
The sinter cooler, essential for cooling hot sintered ore to a specific temperature, has seen recent advancements with the introduction of a vertical sinter cooling furnace. This innovation aims to ...enhance energy efficiency, reduce emissions, and improve waste heat recovery. Despite significant research, a quantitative analysis of factors impacting its cooling and heat transfer efficiency is lacking. This study utilizes the Euler model and local non-equilibrium thermodynamic theory to identify key factors affecting the gas-solid cooperative cooling process in the vertical cooler. Through an orthogonal experimental approach, the paper determines the optimal structural and operational parameters for the furnace. Key findings include that a gas-solid ratio of 1200m^3/t, inlet air temperature of 50 ℃, cooling section height of 6m, and diameter of 13.25m maximize efficiency, achieving a weighted range normalization value of 0.962. This configuration meets sintered ore cooling requirements while optimizing waste heat recovery. The study reveals that the impact on heat transfer efficiency is influenced primarily by the gas-solid ratio, followed by the cooling section's height, diameter, and inlet air temperature. These insights are crucial for enhancing the vertical sinter cooler's design, contributing to more energy-efficient and environmentally friendly sintering processes.
This study aims to achieve dust control from the source, reduce the dust concentration of coal mining faces, and provide a safe and pollution-free working environment for underground operators. In ...this study, dodecyl polyglucoside was used as the matrix material, tris-benzoic acid was used as the crosslinking agent, and eramidopropyl was used as the graft. A new carboxylic anionic surfactant (CAS) was prepared by esterification and amidation crosslinking reactions, nano sodium carboxymethyl cellulose was a micellar accelerator, and a new type of anionic fracturing fluid was prepared. The reaction process and structure of the product were analyzed by infrared spectroscopy, X-ray diffraction and scanning electron microscopy, and the thermal stability of the product was analyzed by thermogravimetry experiments. Related performance testing experiments showed that CAS had a relatively low surface tension, and the product had a relatively high shear viscosity and low filtration. Compared with water and carboxymethyl guar gum fracturing fluid, the product has a better wetting and softening effect on coal. In addition, through molecular dynamics simulation, it is determined that CAS in the product can form a good connection with coal molecules and act firmly on the surface of coal, which greatly promotes the wetting of coal.
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A general and efficient rhodium‐catalyzed asymmetric cyanide‐free hydrocyanation of alkenes has been developed. Based on the asymmetric hydroformylation/condensation/aza‐Cope elimination sequences, a ...broad scope of substrates including mono‐substituted, 1,2‐, and 1,1‐disubstituted alkenes (involving natural product R‐ and S‐limonene) were employed, and a series of valuable chiral nitriles are prepared with high yields (up to 95 %) and enantioselectivities (up to 98 % ee). Notably, the critical factor to achieve high enantioseletivies is the addition of catalytic amount of benzoic acid. This novel methodology provides an efficient and concise synthetic route to the intermediate of vildagliptin and anagliptin.
A general and efficient rhodium‐catalyzed asymmetric cyanide‐free hydrocyanation of alkenes has been developed. Based on the asymmetric hydroformylation/condensation/aza‐Cope elimination sequences, a broad scope of substrates including mono‐substituted, 1,2‐, and 1,1‐disubstituted alkenes were employed, and a series of valuable chiral nitriles are prepared with high yields (up to 95 %) and enantioselectivities (up to 98 % ee).
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