3 years ago

# X(16.7) Production in Electron-Position Collision.

Yi Liang, Long-Bin Chen, Jun Jiang, Cong-Feng Qiao

The anomaly found in the excited $^8\text{Be}$ nuclear transition to its ground state is attributed to a spin-1 gauge boson $X(16.7)$. To hunt for this boson, we propose two traps: $e^+e^-\to X\gamma$ and $J/\psi\to X\gamma$, both following with $X\to e^+e^-$ decay. We adopt the "vector minus axial-vector" interaction hypothesis. Analysis on the $X(16.7)$ decay length, production rates, differential distribution with respect to the $e^+e^-$ invariant-mass spectrum, and the signal-to-noise ratios (SNR) after the smearing at BESIII are discussed in detail. Given the coupling strength between $X$ and fermions $g_f^{v/a}\sim10^{-3}$ at BESIII: (1) there would be about $\sim6000$ $X$ measurable events per year in electron-positron collision, yet with a large background after smearing; (2) while in $J/\psi$ decays, we find that the axial-vector current may come into play; though merely 52 events may appear, the SNR are inspiring even after smearing

Publisher URL: http://arxiv.org/abs/1607.03970

DOI: arXiv:1607.03970v3

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