Measurements of the branching fractions for $J/\psi$ and $\psi^\prime \to \Lambda \bar{\Lambda} \pi^0$ and $\Lambda \bar{\Lambda} \eta$ - INSPIRE

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Measurements of the branching fractions for $J/\psi$ and $\psi^\prime \to \Lambda \bar{\Lambda} \pi^0$ and $\Lambda \bar{\Lambda} \eta$

BESIII

Collaboration

Nov, 2012

11 pages

Published in:

Phys.Rev.D 87 (2013) 5, 052007

Published: Mar 5, 2013

e-Print:

1211.4682 [hep-ex]

DOI:

10.1103/PhysRevD.87.052007

PDG:

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

\rightarrow

{{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}^{0}}

Experiments:

View in:

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Abstract: (APS)

We report on a study of the isospin-violating and isospin-conserving decays of the J/ψ and ψ′ charmonium state to ΛΛ¯π0 and ΛΛ¯η, respectively. The data are based on 225 million J/ψ and 106 million ψ′ events that were collected with the BESIII detector. The most accurate measurement of the branching fraction of the isospin-violating process J/ψ→ΛΛ¯π0 is obtained, and the isospin-conserving processes J/ψ→ΛΛ¯η and ψ′→ΛΛ¯η are observed for the first time. The branching fractions are measured to be B(J/ψ→ΛΛ¯π0)=(3.78±0.27stat±0.30sys)×10-5, B(J/ψ→ΛΛ¯η)=(15.7±0.80stat±1.54sys)×10-5 and B(ψ′→ΛΛ¯η)=(2.48±0.34stat±0.19sys)×10-5. No significant signal events are observed for ψ′→ΛΛ¯π0 decay resulting in an upper limit of the branching fraction of B(ψ′→ΛΛ¯π0)<0.29×10-5 at the 90% confidence level. The two-body decay of J/ψ→Σ(1385)0Λ¯+c.c. is searched for, and the upper limit is B(J/ψ→Σ(1385)0Λ¯+c.c.)<0.82×10-5 at the 90% confidence level.

13.25.Gv
12.38.Qk
14.20.Gk
psi(3685): hadronic decay
J/psi(3100): hadronic decay
psi mesons: branching ratio: measured
branching ratio: upper limit
Sigma(1385)0
isospin: conservation law
BES

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