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Rescattering effects of baryon and antibaryon in heavy quarkonium decays

H. Chen
(
- SWU, Chongqing
)
,
R.G. Ping
(
- Beijing, Inst. High Energy Phys.
)

Jan, 2006

6 pages

Published in:

Phys.Lett.B 644 (2007) 54-58

e-Print:

hep-ph/0601202 [hep-ph]

DOI:

10.1016/j.physletb.2006.05.093

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Abstract:

Rescattering effects of baryon and antibaryon in heavy quarkonium decays are investigated by studying their angular distributions. The rescattering amplitudes are phenomenologically evaluated by modeling the intermediate range interaction as a

\sigma

or pion meson exchange between

q\bar{q}

quarks. The results show that the rescattering effects play an important role in determination of the angular distribution in heavy quarkonium decays. Especially, for

J/psi

and

\psi'

decays into

\Lambda \bar \Lambda

,

\Sigma^0\bar \Sigma^0

and

\Xi^-\bar \Xi^+

the angular distribution parameters could turn to be negative values in the limit of helicity conservation. These results provide us a possible explanation for understanding the negative sign of the angular distribution parameter measured for

J/psi \to\Sigma^0\bar\Sigma^0

, namely, {\it it might come from the baryonic SU(3)

_F

symmetry breaking by incorporating rescattering effects

13.25.Gv
12.39.Pn
13.75.Ev
Rescattering effects
Heavy quarkonium
Baryon
quarkonium: hadronic decay
J/psi(3100): hadronic decay
psi(3685): hadronic decay
Upsilon(9460): hadronic decay

References(13)

Figures(0)

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