Threshold Resummation Effects in Neutral Higgs Boson Production by Bottom Quark Fusion at the CERN Large Hadron Collider

We investigate the QCD effects in the production of neutral Higgs bosons via bottom quark fusion in both the standard model and the minimal supersymmetric standard model at the CERN Large Hadron Collider. We include the next-to-leading order (NLO) QCD corrections (including supersymmetric QCD) and the threshold resummation effects. We use the soft-collinear effective theory to resum the large logarithms near threshold from soft gluon emission. Our results show that the resummation effects can enhance the total cross sections by about 5% compared with the NLO results.Comment: 29pages, 14 figures, version to appear in Physical Review

Metal adsorption by quasi cellulose xanthogenates derived from aquatic and terrestrial plant materials

The FTIR spectra, SEM-EDXA and copper adsorption capacities of the raw plant materials, alkali treated straws and cellulose xanthogenate derivatives of Eichhornia crassipes shoot, rape straw and corn stalk were investigated. FTIR spectra indicated that of the three plant materials, the aquatic biomass of Eichhornia crassipes shoot contained more O-H and C=O groups which accounted for the higher Cu²⁺ adsorption capacities of the raw and alkali treated plant material. SEM-EDXA indicated the incorporation of sulphur and magnesium in the cellulose xanthogenate. The Cu²⁺ adsorption capacities of the xanthogenates increased with their magnesium and sulphur contents. However more copper was adsorbed than that can be explained by exchange of copper with magnesium. Precipitation may contribute to the enhanced uptake of copper by the cellulose xanthogenate

1,2-Bis(3-hydroxy­benzyl­idene)diazane

The asymmetric unit of the title compound, C14H12N2O2, which was synthesized unexpectedly by refluxing an ethano­lic solution of isonicotinic hydrazide and 3-hydroxy­benzaldehyde, contains one half-mol­ecule with the center of the N—N bond lying on a crystallographic center of inversion. In the crystal structure, mol­ecules are linked by inter­molecular O—H⋯N hydrogen bonds into an infinite layer structure parallel to (110)

Joint implications of BBN, CMB, and PTA Datasets for Scalar-Induced Gravitational Waves of Second and Third orders

Assuming the evidence for gravitational wave background from recent data release of pulsar timing arrays to be interpreted as the scalar-induced gravitational waves (SIGWs), we study the second and third order gravitational waves simultaneously, by jointly analyzing a combination of PTA, big-bang nucleosynthesis (BBN), and cosmic microwave background (CMB) datasets. We obtain the primordial curvature spectral amplitude $0.014<A_\zeta<0.058$ and the spectral peak frequency $10^{-7.4}\ \mathrm{Hz}<f_\ast<10^{-6.4}\ \mathrm{Hz}$at 95\% confidence level, indicating a mass range of primordial black holes (PBHs)$10^{-4.3}M_\odot<m_{\mathrm{pbh}}<10^{-2.3}M_\odot$. We further find that the third order gravitational waves have greater contributions to the integrated energy density than the second order gravitational waves when$A_\zeta\gtrsim0.06$. In addition, we anticipate that future PTA projects can not only test the above results, but also have powerful abilities to explore the origin and evolution of the universe, particularly, the inflation.Comment: 12 pages, 2 figure