First observation of the isospin violating decay $J/\psi\rightarrow \Lambda\bar{\Sigma}^{0}+c.c.$

Ablikim, M.; Achasov, M.N.; Ambrose, D.J.; An, F.F.; An, Q.; An, Z.H.; Bai, J.Z.; Ban, Y.; Becker, J.; Berger, N.

doi:10.1103/PhysRevD.86.032008

First observation of the isospin violating decay $J/\psi\rightarrow \Lambda\bar{\Sigma}^{0}+c.c.$

BESIII

Collaboration

Jul, 2012

9 pages

Published in:

Phys.Rev.D 86 (2012) 032008

e-Print:

1207.1201 [hep-ex]

DOI:

10.1103/PhysRevD.86.032008

PDG:

{{\mathit \eta}_{{{c}}}{(1S)}}

\rightarrow

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

Experiments:

BEPC-BES-III

View in:

pdflinks

reference search30 citations

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Abstract: (arXiv)

Using a sample of

(225.2\pm 2.8)\times 10^6

J/\psi

events collected with the BESIII detector, we present results of a study of

J/\psi\rightarrow \gamma\Lambda\bar{\Lambda}

and report the first observation of the isospin violating decay

J/\psi\rightarrow\Lambda\bar{\Sigma}^{0}+c.c.

, in which

\bar{\Sigma}^{0}

decays to

\gamma \bar{\Lambda}

. The measured branching fractions are

\mathcal{B}(J/\psi\rightarrow\bar{\Lambda}\Sigma^{0}

) =

(1.46\pm0.11\pm0.12) \times10^{-5}

and

\mathcal{B}(J/\psi\rightarrow\Lambda\bar{\Sigma^{0}}

) =

(1.37\pm0.12\pm0.11) \times10^{-5}

. We search for

\Lambda(1520) \rightarrow \gamma \Lambda

decay, and find no evident signal, and an upper limit for the product branching fraction

\mathcal{B}(J/\psi\rightarrow\Lambda\bar{\Lambda}(1520)+c.c.)\times \mathcal{B}(\Lambda(1520)\rightarrow\gamma\Lambda)<4.1 \times10^{-6}

is set at the 90% confidence level. We also report the observation of

\eta_{c}\rightarrow\Lambda\bar{\Lambda}

in

J/\psi \rightarrow \gamma \eta_{c}

,

\eta_{c}\rightarrow\Lambda\bar{\Lambda}

and measure the branching fraction

\mathcal{B}(\eta_{c}\rightarrow\Lambda\bar{\Lambda}) =(1.16\pm0.12 (stat)\pm0.19(syst)\pm0.28(PDG))\times10^{-3}

.

Note:

9 pages, 6 figures; This is a publication-version at Phys. Rev. D

13.25.Gv
13.60.Rj
12.38.Qk
14.20.Jn
J/psi(3100): radiative decay
isospin: violation
J/psi(3100): branching ratio: measured
BES
electron positron: annihilation
Lambda: pair production

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First observation of the isospin violating decay J/ψ→ΛΣˉ0+c.c.J/\psi\rightarrow \Lambda\bar{\Sigma}^{0}+c.c.J/ψ→ΛΣˉ0+c.c.

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First observation of the isospin violating decay $J/\psi\rightarrow \Lambda\bar{\Sigma}^{0}+c.c.$