Search for a dark vector gauge boson decaying to π+π\pi^+ \pi^- using ηπ+πγ\eta \rightarrow \pi^+\pi^- \gamma decays

Collaboration
Sep 19, 2016
6 pages
Published in:
  • Phys.Rev.D 94 (2016) 9, 092006
  • Published: Nov 29, 2016
e-Print:
Experiments:

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Abstract: (APS)
We report a search for a dark vector gauge boson U′ that couples to quarks in the decay chain D*+→D0π+,D0→KS0η,η→U′γ, U′→π+π-. No signal is found and we set a mass-dependent limit on the baryonic fine structure constant of 10-3-10-2 in the U′ mass range of 290 to 520  MeV/c2. This analysis is based on a data sample of 976  fb-1 collected by the Belle experiment at the KEKB asymmetric-energy e+e- collider.
Note:
  • 6 pages, 4 figures
  • fundamental constant: fine structure
  • vector boson: dark matter
  • vector boson: decay
  • vector boson: mass
  • mass dependence
  • BELLE
  • KEK-B
  • eta --> pi+ pi- photon