Study of $J/\psi$ and $\psi(3686)$ decay to $\Lambda\bar{\Lambda}$ and $\Sigma^0\bar{\Sigma}^0$ final states - INSPIRE

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Study of $J/\psi$ and $\psi(3686)$ decay to $\Lambda\bar{\Lambda}$ and $\Sigma^0\bar{\Sigma}^0$ final states

BESIII

Collaboration

Jan 25, 2017

10 pages

Published in:

Phys.Rev.D 95 (2017) 5, 052003

Published: Mar 15, 2017

e-Print:

1701.07191 [hep-ex]

DOI:

10.1103/PhysRevD.95.052003

PDG:

{{\mathit J / \psi}{(1S)}}

\rightarrow

{{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}

Experiments:

BEPC-BES-III

View in:

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Abstract: (APS)

Using 1310.6×106 J/ψ and 447.9×106 ψ(3686) events collected with the BESIII detector at the BEPCII e+e- collider, the branching fractions and the angular distributions of J/ψ and ψ(3686) decays to ΛΛ¯ and Σ0Σ¯0 final states are measured. The branching fractions are determined, with much improved precision, to be 19.43±0.03±0.33, 11.64±0.04±0.23, 3.97±0.02±0.12 and 2.44±0.03±0.11 for J/ψ→ΛΛ¯, J/ψ→Σ0Σ¯0, ψ(3686)→ΛΛ¯ and ψ(3686)→Σ0Σ¯0, respectively. The polar angular distributions of ψ(3686) decays are measured for the first time, while those of J/ψ decays are measured with much improved precision. In addition, the ratios of branching fractions B(ψ(3686)→ΛΛ¯)B(J/ψ→ΛΛ¯) and B(ψ(3686)→Σ0Σ¯0)B(J/ψ→Σ0Σ¯0) are determined to test the “12% rule.”

Note:

10 pages, 8 figures

electron positron: annihilation
electron positron: colliding beams
J/psi(3100): electroproduction
psi(3685): electroproduction
J/psi(3100): hadronic decay
psi(3685): hadronic decay
Lambda: pair production
Sigma: pair production
branching ratio: ratio: measured
J/psi(3100): branching ratio

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Figures(8)

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