【摘 要】
：
The BLMSSM is an extension of the minimal supersymmetric standard model (MSSM).Its local gauge group is S U(3)C × S U(2)L × U(1)y × U(1)B × U(1)L.Supposing the lightest scalar neutrino is a dark matter candid-ate,we study the relic density and the spin in
【机 构】
：
Department of Physics,Hebei University,Baoding 071002,China;Key Laboratory of High-precision Computa
论文部分内容阅读
The BLMSSM is an extension of the minimal supersymmetric standard model (MSSM).Its local gauge group is S U(3)C × S U(2)L × U(1)y × U(1)B × U(1)L.Supposing the lightest scalar neutrino is a dark matter candid-ate,we study the relic density and the spin independent cross section of sneutrino scattering offa nucleon.We calcu-late the numerical results in detail and find a suitable parameter space.The numerical discussion can confine the parameter space and provide a reference for dark matter research.
其他文献
Proton capture reactions on Mg isotopes are significant in the Mg-Al cycle in stellar H-burning.In par-ticular,the resonance strengths and branching ratios of low-energy resonances in 25Mg(p,γ)26A1 reactions determine the production of 26Al,which is one o
Angular correlations between a heavy quark (HQ) and its tagged jet are potentially new tools to gain in-sight into the in-medium partonic interactions in relativistic heavy-ion collisions.In this work,we present the first theoretical study on the radial p
A systematic analysis on experimental data of the half-lives of nuclear double-β decays with two neutri-nos(2vββ)is performed based on the analytical formula proposed by Primakoff and Rosen.We improve the for-mula by considering the shell effects and refi
The dark matter puzzle is one of the most important fundamental physics questions in the 21 st century.There is no doubt that solving the puzzle will be a new milestone for human beings in achieving a deeper under-standing of nature.Herein,we propose the
We examined the low-lying quadrupole states in Sn isotopes in the framework of fully self-consistent Hartree-Fock+BCS plus QRPA.We focus on the effect of the density-dependence of pairing interaction on the prop-erties of the low-lying quadrupole state.Th
A multi-nucleon transfer and cluster decay experiment,7Li(11B,14C* → α+10Be)α,is conducted at an incident beam energy of 55 MeV.This reaction channel has a significantly large Q-value,which favors populating the high lying resonant states in 14C.The decay
We calculate photon sphere rph and critical curve bc for a quantum corrected Schwarzschild black hole,finding that they violate universal inequalities proved for asymptotically flat black holes that satisfy the null energy condition in the framework of Ei
We explore constraints on various new physics resonances from four top-quark production based on cur-rent experimental data.Both light and heavy resonances are studied in this work.A comparison of the full width ef-fect and narrow width approximation is a
Primordial black holes have been considered attractive dark matter candidates,whereas some of the pre-dictions rely heavily on the near-horizon physics that remains to be tested experimentally.As a concrete alternative,thermal 2-2-holes closely resemble b
We have calculated the mass spectra for the (D)(*)sD(*) molecular states and sc(qc) tetraquark states with JP =0+,1+,2+.The masses of the axial-vector (D)sD*,(D)*sD molecular states and 1[se]⊕0[(qc)],0[sc]⊕ 1[(qc)]tetra-quark states are predicted to be ap