New G-parity violating amplitude in the J/ψ decay?
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DOI: 10.1103/physrevd.95.034038
Abstract: The $J/\psi$ meson has negative $G$-parity so that, in the limit of isospin conservation, its decay into $\pi^+\pi^-$ should be purely electromagnetic. However, the measured branching fraction $\mathcal{B}(J/\psi\to\pi^+\pi^-)$ exceeds by more than 3.9 standard deviations… read more here.
Keywords: parity; decay; new parity; violating amplitude ... See more keywords