English

New approach to finding invisible states in $e^+e^-$ annihilation and application to BESIII data

High Energy Physics - Experiment 2023-11-09 v1 High Energy Physics - Lattice High Energy Physics - Phenomenology

Abstract

We compare precision e+ee^+e^- to μ+μ\mu^+\mu^- cross section measurements by BESIII in the E_cm =3.8-4.6 GeV range, to predictions based on measured R_had data. The consistency is poor (p-value <0.012). Allowing for resonance contributions not seen in R_had gives an excellent fit, with the state at 4421 MeV ( 4.6 sigma) giving insight into the psi(4415) and the 3.1 sigma structure at 4211 MeV, if confirmed, being a new, very narrow resonance. This analysis shows the power of precision e+ee^+e^- to μ+μ\mu^+\mu^- measurements to uncover or probe otherwise difficult to access states.

Keywords

Cite

@article{arxiv.2311.04654,
  title  = {New approach to finding invisible states in $e^+e^-$ annihilation and application to BESIII data},
  author = {Glennys R. Farrar and Qi-Ming Li and Chang-Zheng Yuan},
  journal= {arXiv preprint arXiv:2311.04654},
  year   = {2023}
}