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2011

Chiral Symmetry and Charmonium Decays to Two Pseudoscalars

Bijnens, Johan, Jemos, Ilaria

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We apply hard pion Chiral Perturbation Theory to charmonium decays to $\pi\pi$, $KK$ and $\eta\eta$.

We first discuss why we expect to be able to provide results for the chiral logarithms in $\chi_{c0}$ and $\chi_{c2}$ decays to two pseudoscalars while for the decays from $J/\psi$, $\psi(nS)$ and $\chi_{c1}$ no simple prediction is possible.
The leading chiral logarithm turns out to be absent for $\chi_{c0},\chi_{c2}\to PP$.
This result is true for all fully chiral singlet states of spin zero and two.

Chiral Symmetry and Charmonium Decays to Two Pseudoscalars · Around

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Then

J. Bijnens and A. Celis, Phys. Lett. B 680
Original
2009
Later among the works it cites.
J. Bijnens and I. Jemos, Nucl. Phys. B 840
Original
2010
Later among the works it cites.
J. Bijnens, I. Jemos, Nucl. Phys. B846
Original
2011
Closest in time.
K. Nakamura et al
2012
Closest in time.

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