The recent observations of the purely leptonic decay D_s⁺→μ⁺ν_μ and τ+ν_τ at CLEO-c and B factory may allow a possible contribution from a charged Higgs boson. One such measurement of the decay constant f_Ds differs from the most precise unquenched latti...

In the framework of the littlest Higgs model with T-parity, we study the top pair production at the next generation colliders like LHC and ILC. We find that the order O(α_s) corrections to the standard model top pair production cross section at LHC ca...

Using the Seiberg-Witten map, we obtain a quantum electrodynamics on a
noncommutative space, which has arbitrary charge and keep the gauge
invariance to at the leading order in theta. The one-loop divergence and
Compton scattering are reinvestigated. Th...

Based on the Weinberg-Salam theory, the competition of the Neutrino Energy Loss (NEL) rates due to the pair, photo- and plasma process are canvassed. The ratio factor C₁, C₂ and C₃ which correspond the different contributions of the pair, photo- and ...

High resolution studies of a₀/f₀(980) decays into channels involving open strangeness are currently being performed at COSY-J\"ulich. As a "filter'' for isospin-zero intermediate states, {i.e.} to selectively produce the f₀(980) resonance, the $\rm d...

In this paper, the least square fitting method with the cubic B-spline basis functions is derived to reduce the influence of statistical fluctuations in the gamma ray spectra. The derived procedure is simple and automatic. The results show that this ...

On the basis of the light nuclear reaction model, a new kerma coefficient formula has been developed. In terms of the analysis for n+¹⁶O reactions below 30 MeV, the average energies of all kinds of the emitted particles are presented. The calculated ...

In order to trace azimuthal angle dependence of the initial interaction in ultra-relativistic heavy ion collision, two azimuthal multiplicity-correlation patterns
— neighboring and fixed-to-arbitrary angular-bin correlation patterns — are suggested. F...

In this paper a two dimensional readout micromegas detector with a polyethylene foil as converter was simulated on GEANT4 toolkit and GARFIELD for fast neutron detection. A new track reconstruction method based on time coincidence technology was deve...

The enhanced low-dose-rate sensitivity (ELDRS) and dose-rate dependence of vertical NPN transistors are investigated in this article. The results show that the vertical NPN transistors exhibit more degradation at low dose rate, and that this degradat...

We have tested and analyzed the properties of two-dimensional Position-Sensitive-silicon-Detector (PSD) with new integrated preamplifiers. The test demonstrates that the best position resolution for 5.5 MeV α particles is 1.7 mm (FWHM), and the best ...

We simulate the response of a modified Anderson-Braun rem counter in the energy range from thermal energy to about 10 GeV using the FLUKA code. Also, we simulate the lethargy spectrum of CSNS outside the beam dump.
Traditional BF₃ tube is replaced by ...

Undulators are key devices to produce brilliant synchrotron radiation at the synchrotron radiation facilities. In this paper we present a numerical computing method, including the computing program that has been developed to calculate the spontaneous...

In the storage ring of the third generation light sources, nonlinear optimization is an indispensable course in order to obtain ample dynamic acceptances and to reach high injection efficiency and long beam lifetime, especially in a low emittance lat...

The physical design of the 2-cell superconducting cavity is presented. The RF parameters of the cavity and HOMs (high order modes) are reported. In this paper, we put the emphasis on the analysis of the HOMs and interaction between beam and cavity.

Research and development of a 1.3 GHz 9-cell cavity test cryomodule were carried out by a collaboration group between IHEP (Institute of High Energy Physics) and TIPC (Technical Institute of Physics and Chemistry) in China. The cryomodule is a "test ...

A high-performance positron age-momentum correlation (AMOC) spectrometer was newly developed. The counting rate is increased up to 200 cps much larger than the value 20~cps reported by other international groups. And at the same time, the time resolu...