4,988 research outputs found
associated production at LHC in the general 2HDM with Spontaneous CP Violation
Spontaneous CP violation motivates the introduction of two Higgs doublets in
the electroweak theory. Such a simple extension of the standard model has three
neutral Higgs bosons and a pair charged Higgs, especially it leads to rich
CP-violating sources including the induced Kobayashi-Maskawa CP-violating
phase, the mixing of the neutral Higgs bosons due to the CP-odd Higgs and the
effective complex Yukawa couplings of the charged and neutral Higgs bosons.
Within this model, we present the production of a charged Higgs boson in
association with a W boson at the LHC, and calculate in detail the cross
section and the transverse momentum distribution of the associated W boson.Comment: 16 pages, 6 figures, omitted 3 figures, motivations for Type III 2HDM
with SCPV is emphasized, to be published in PR
Exclusive Decays and CP Violation in the General two-Higgs-doublet Model
Using the general factorization approach, we present a detailed investigation
for the branching ratios, CP asymmetries and longitudinal polarization
fractions in all charmless hadronic decays (except for the pure
annihilation processes) within the most general two-Higgs-doublet model with
spontaneous CP violation. It is seen that such a new physics model only has
very small contributions to the branching ratios and longitudinal polarization
fractions. However, as the model has rich CP-violating sources, it can lead to
significant effects on the CP asymmetries, especially on those of
penguin-dominated decay modes, which provides good signals for probing new
physics beyond the SM in the future B-physics experiments.Comment: 17 pages, no figure
Six-Quark Amplitudes from Fermionic MHV Vertices
The fermionic extension of the CSW approach to perturbative gauge theory
coupled with fermions is used to compute the six-quark QCD amplitudes. We find
complete agreement with the results obtained by using the usual Feynman rules.Comment: Latex file, 16 pages, 4 figure
Thermodynamic properties of Ba1-xMxFe2As2 (M = La and K)
The specific heat of BaFeAs single crystal, electron-doped
BaLaFeAs and hole-doped BaKFeAs
polycrystals were measured. For undoped BaFeAs single crystal, a very
sharp specific heat peak was observed at 136 K. This is attributed to the
structural and antiferromagnetic transitions occurring at the same temperature.
of the electron-doped non-superconducting
BaLaFeAs also shows a small peak at 120 K, indicating a
similar but weaker structural/antiferromagnetic transition. For the hole-doped
superconducting BaKFeAs, a clear peak of was
observed at = 36 K, which is the highest peak seen at superconducting
transition for iron-based high- superconductors so far. The electronic
specific heat coefficient and Debye temperature of these
compounds were obtained from the low temperature data
Effects of water stress and nitrogen supply on leaf gas exchange and fluorescence parameters of Sophora davidii seedlings
Abstract Two-month-old seedlings of Sophora davidii were subjected to a randomized complete block design with three water (80, 40, and 20 % of water field capacity, i.e. FC 80 , FC 40 , and FC 20 ) and three N supply [N0: 0, Nl: 92 and Nh: 184 mg(N) kg -1 (soil)] regimes. Water stress produced decreased leaf area (LA) and photosynthetic pigment contents, inhibited photosynthetic efficiency, and induced photodamage in photosystem 2 (PS2), but increased specific leaf area (SLA). The decreased net photosynthetic rate (P N ) under medium water stress (FC 40 ) compared to control (FC 80 ) might result from stomatal limitations, but the decreased P N under severe water deficit (FC 20 ) might be attributed to non-stomatal limitations. On the other hand, N supply could improve photosynthetic capacity by increasing LA and photosynthetic pigment contents, and enhancing photosynthetic efficiency under water deficit. Moreover, N supply did a little in alleviating photodamages to PS2 caused by water stress. Hence water stress was the primary limitation in photosynthetic processes of S. davidii seedlings, while the photosynthetic characters of seedlings exhibited positive responses to N supply. Appropriate N supply is recommended to improve photosynthetic efficiency and alleviate photodamage under water stress
High-precision numerical simulation for effect of casting speed on solidification of 40Cr during continuous billet casting
In order to study the effects of casting speed on the solidification process and optimize the process to reducedefects, a high-precision simulation model of solidification and heat transfer of square billet based on nailing test andtemperature measurement is presented. The experiments have proven that values calculated by the model fit well themeasured values and the relative error is maintained less than 2%. Some new rules about the relationships amongcasting speed, solidification end point and shell thickness are proposed in the paper for the first time
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