Abstract
AbstractWe study the isospin violating decays of vector charmonia to $$\Lambda \overline{\Sigma }^0$$
Λ
Σ
¯
0
and its charge conjugate. They are dominated by the single photon annihilation and can be evaluated reliably with timelike form factors. We utilize the quark-pair creation model, which is valid for the OZI suppressed decays, to evaluate the form factors. We obtain the branching fractions of $$\mathcal{B}(J/\psi \rightarrow \Lambda \overline{\Sigma }^0+c.c.)=(2.4\pm 0.4)\times 10^{-5}$$
B
(
J
/
ψ
→
Λ
Σ
¯
0
+
c
.
c
.
)
=
(
2.4
±
0.4
)
×
10
-
5
and $$\mathcal{B}(\psi (2\,S)\rightarrow \Lambda \overline{\Sigma }^0+c.c.)=(3.0\pm 0.5)\times 10^{-6}$$
B
(
ψ
(
2
S
)
→
Λ
Σ
¯
0
+
c
.
c
.
)
=
(
3.0
±
0.5
)
×
10
-
6
, which are compatible with the measurements by the BESIII collaborations, respectively. The decay asymmetries are found to be $$\alpha _{J/\psi }=0.314$$
α
J
/
ψ
=
0.314
and $$\alpha _{\psi (2S)}=0.461$$
α
ψ
(
2
S
)
=
0.461
, which can be examined at BESIII in the foreseeable future.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
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