51 research outputs found
Syntheses and characterization of electrically conductive and fluorescent poly[3-(ω-bromoalkyl)thiophenes]
10.1016/S0379-6779(98)01496-9Synthetic Metals1003269-277SYME
Pattern prediction of extended hemispherical-lens/objective-lens antenna system at millimetre wavelengths
BP neural network integration model research for hydraulic metal structure health diagnosing
Rapid detonation initiation by sparks in a short duct: A numerical study
10.1007/s00193-010-0252-4Shock Waves203241-24
Quantitative research on the water ecological environment of dam-controlled rivers: case study of the Shaying River, China
Measurement of the absolute branching fraction for Λc+→Λμ+νμ
We report the first measurement of the absolute branching fraction for Λc+→Λμ+νμ. This measurement is based on a sample of e+e− annihilation data produced at a center-of-mass energy s=4.6 GeV, collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb−1. The branching fraction is determined to be B(Λc+→Λμ+νμ)=(3.49±0.46(stat)±0.27(syst))%. In addition, we calculate the ratio B(Λc+→Λμ+νμ)/B(Λc+→Λe+νe) to be 0.96±0.16(stat)±0.04(syst)
Determination of the number of J/ψ events with inclusive J/ψ decays
A measurement of the number of J/ψ events collected with the BESIII detector in 2009 and 2012 is performed using inclusive decays of the J/ψ. The number of J/ψ events taken in 2009 is recalculated to be (223.7 ± 1.4) × 106, which is in good agreement with the previous measurement, but with significantly improved precision due to improvements in the BESIII software. The number of J/ψ events taken in 2012 is determined to be (1086.9 ± 6.0) × 106. In total, the number of J/ψ events collected with the BESIII detector is measured to be (1310.6 ± 7.0) × 106, where the uncertainty is dominated by systematic effects and the statistical uncertainty is negligible
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