Search NASA⌕ Search

Engineering topics

de Boer, R. E.

Publications and source records attributed to de Boer, R. E..

At least 253 records · Page 14
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

Amplitude analysis and branching fraction measurement of the decay $D_s^{+}$ → $π^+π^0π^0$

Using a data set corresponding to an integrated luminosity of 6.32 fb –1 recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, an amplitude analysis of the decay $D_s^{+}$ → $π^+π^0π^0$ is performed, and the relative fractions and phases of different intermediate processes are determined. The absolute branching fraction of the decay $D_s^{+}$ → $π^+π^0π^0$ is measured to be (0.50 ± 0.04 stat ± 0.02 syst )%. The absolute branching fraction of the intermediate process $D_s^{+}$ → $f_o$(980)$π^+$, $f_o$(980) → $π^oπ^o$ is determined to be (0.28 ± 0.04 stat ± 0.04 syst )%.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2021

Measurement of branching fractions of $J/\psi$ and $\psi$(3686) decays to $\Sigma^+$< and $\overline\Sigma^-$

Using 1310.6 x 10 6 J/ψ and 448.1 x 10 6 ψ(3686) events collected with the BESIII detector, the branching fractions of J/ψ decays to $Σ^+\overline{Σ}^-$ is measured to be (10.61 ± 0.04 ± 0.36) x 10 -4 , which is significantly more precise than the current world average. The branching fractions of ψ(3686) decays to $Σ^+\overline{Σ}^-$ is measured to be (2.52 ± 0.04 ± 0.09) x 10 -4 , which is consistent with the previous measurements. In addition, the ratio of $\mathcal{B}$(ψ(3686) → $Σ^+\overline{Σ}^-$)/$\mathcal{B}$(J/ψ → $Σ^+\overline{Σ}^-$) is determined to be (23.8 ± 1.1)% which violates the “12% rule”.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2021

Observation of the decays $χ$ cJ → $\mathrm{nK}^0_s\overline{Λ}$ + $c.c.$

By analyzing 4.48 x 10 8 ψ(3686) events collected with the BESIII detector, we observe the decays $χ$ cJ → $\mathrm{nK}^0_s\overline{Λ}$ + $c.c.$ (J = 0, 1, 2) for the first time, via the radiative transition ψ(3686) → $γχ_{cJ}$. The branching fractions are determined to be (6.65 ± 0.26 stat ± 0.41 syst ) x 10 -4 , (1.66 ± 0.12 stat ± 0.12 syst ) x 10 -4 , and (3.58 ± 0.16 stat ± 0.23 syst ) x 10 -4 for J = 0, 1, and 2, respectively.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗