Search for a dark baryon in the ${\Xi }^{-}\to {\pi }^{-}+\mathrm{invisible}$ decay

Abstract

A search for a dark baryon is performed for the first time in the two-body decay ${\Xi }^{-}\to {\pi }^{-}+\mathrm{invisible}$ using $(10.087\pm 0.044)\times 10^9$ $J/\psi$ events collected at a center-of-mass energy of $\sqrt{s}=3.097\,\mbox{GeV}$ with the BESIII detector at the BEPCII collider. No significant signal is observed, and the 90% (95%) confidence level upper limits on the branching fraction $B({\Xi }^{-}\to {\pi }^{-}+\mathrm{invisible})$ are determined to be $4.2\times 10^{-5}$ ($5.2\times 10^{-5}$), $6.9\times 10^{-5}$ ($8.4\times 10^{-5}$), $6.5\times 10^{-4}$ ($7.6\times 10^{-4}$), $1.1\times 10^{-4}$ ($1.3\times 10^{-4}$) and $4.5\times 10^{-5}$ ($5.5\times 10^{-5}$), under the dark baryon mass hypotheses of 1.07$\,\mbox{GeV}/c^2$, 1.10$\,\mbox{GeV}/c^2$, $m_{\Lambda }$ (1.116$\,\mbox{GeV}/c^2$), 1.13$\,\mbox{GeV}/c^2$, and 1.16$\,\mbox{GeV}/c^2$, respectively. The constraints obtained on the Wilson coefficients $C_{us,s}^L$ and $C_{us,s}^R$ are more stringent than the previous limits derived from the LHC searches for the colored mediators.

arXiv comment11 pages, 4 figures, 1 table

References in corpus (15)

• Asymptotic formulae for likelihood-based tests of new physics
• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Future Physics Programme of BESIII
• Asymmetric Dark Matter: Theories, Signatures, and Constraints
• Kernel Estimation in High-Energy Physics
• Review of asymmetric dark matter
• Dark Matter Interpretation of the Neutron Decay Anomaly
• Polarization and Entanglement in Baryon-Antibaryon Pair Production in Electron-Positron Annihilation
• Method for detector description transformation to Unity and application in BESIII
• TopoAna: A generic tool for the event type analysis of inclusive Monte-Carlo samples in high energy physics experiments
• Baryogenesis and Dark Matter from $B$ Mesons
• Weak phases and CP-symmetry tests in sequential decays of entangled double-strange baryons
• Collider Signals of Baryogenesis and Dark Matter from $B$ Mesons: A Roadmap to Discovery
• Search for a massless particle beyond the Standard Model in the ${\Sigma }^{+}\to p+\mathrm{invisible}$ decay