We investigate in detail the effects of R-parity lepton number violation on the decay ~↑b1→b~↑x1^0 in the R-parity violating minimal supersymmetric standard model (Rp-MSSM) under the present experimental constraint...We investigate in detail the effects of R-parity lepton number violation on the decay ~↑b1→b~↑x1^0 in the R-parity violating minimal supersymmetric standard model (Rp-MSSM) under the present experimental constraints on Rp parameters. In our numerical calculations we consider two cases of input parameters of the squark and slepton sectors, Msquark<Mslepton and Msquark>Mslepton, for comparison. The results show that the relative R-parity violating correction is not very sensitive to the mass of the lightest neutralino -0↑x1 and the degenerate R-parity violating coupling parameter λ2′, but strongly depends on Msquark, Mslepton, tan β and the degenerate R-parity violating coupling parameter λ1′. The relative correction is about -4～3% and can exceed -6% in some region of parameter space. Therefore, precise experiment analyses on the decay ~↑b1→b~↑x1^0 may provide a probe of the R-parity violation.展开更多
The survival probability of a compound nucleus measures the competition among the neutron evaporation, light charged particle emissions and fission in the process of its de-excitation. It is considered as one of the c...The survival probability of a compound nucleus measures the competition among the neutron evaporation, light charged particle emissions and fission in the process of its de-excitation. It is considered as one of the crucial factors for producing superheavy elements, which is usually described by the existing statistical models[1]. In spite of the well developed statistical theory itself, however, due to the unclearness of the structure of superheavy nuclei, some characteristic quantities for evaluating the fission and particle emission widths are correspondingly ambiguous. This report gives the study on the odd-even effects of the survival probability based on a statistical model. The calculation details can be found.展开更多
文摘We investigate in detail the effects of R-parity lepton number violation on the decay ~↑b1→b~↑x1^0 in the R-parity violating minimal supersymmetric standard model (Rp-MSSM) under the present experimental constraints on Rp parameters. In our numerical calculations we consider two cases of input parameters of the squark and slepton sectors, Msquark<Mslepton and Msquark>Mslepton, for comparison. The results show that the relative R-parity violating correction is not very sensitive to the mass of the lightest neutralino -0↑x1 and the degenerate R-parity violating coupling parameter λ2′, but strongly depends on Msquark, Mslepton, tan β and the degenerate R-parity violating coupling parameter λ1′. The relative correction is about -4～3% and can exceed -6% in some region of parameter space. Therefore, precise experiment analyses on the decay ~↑b1→b~↑x1^0 may provide a probe of the R-parity violation.
文摘The survival probability of a compound nucleus measures the competition among the neutron evaporation, light charged particle emissions and fission in the process of its de-excitation. It is considered as one of the crucial factors for producing superheavy elements, which is usually described by the existing statistical models[1]. In spite of the well developed statistical theory itself, however, due to the unclearness of the structure of superheavy nuclei, some characteristic quantities for evaluating the fission and particle emission widths are correspondingly ambiguous. This report gives the study on the odd-even effects of the survival probability based on a statistical model. The calculation details can be found.
