Archive | 2021
The implication of $J/\\psi\\to (\\gamma + ){\\rm invisible}$ for the effective field theories of neutrino and dark matter
Abstract
The implication of J/ψ → γ + invisible for the effective field theories of neutrino and dark matter Tong Li,1, ∗ Xiao-Dong Ma,2, † Michael A. Schmidt,3, ‡ and Rui-Jia Zhang1, § 1School of Physics, Nankai University, Tianjin 300071, China 2Tsung-Dao Lee Institute, and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 20024, China 3School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia Sydney Consortium for Particle Physics and Cosmology Abstract We study the implication of J/ψ radiative decay into invisible particles for light sterile neutrino and subGeV dark matter (DM). The low-energy effective field theories (EFTs) are used for the description of general neutrino interactions and the Dirac fermion DM coupled to charm quark. We perform the likelihood fits for the individual neutrino and DM operators with distinct Lorentz structures and photon spectra. The limits on the decay branching fractions are obtained for different neutrino or DM scenarios and then converted to the lower bounds on the new energy scales. The most stringent bounds on the energy scale in neutrino and DM EFTs are 12.8 GeV and 11.6 GeV, respectively. We also evaluate the limit on the DM-nucleon scattering cross section converted from BESIII data. The BESIII J/ψ data is sensitive to the light DM mass range where the DM direct detection experiments cannot probe yet. The future Super Tau Charm Factory after one year run can push the limits down by two orders of magnitude.