CUSB explained

CUSB (Columbia University-Stony Brook) was a particle detector at the Cornell Electron Storage Ring. CUSB, along with CLEO, discovered both the Υ(3S)^[1] and Υ(4S) meson resonances.^[2] They also produced studies of the photon transitions between the Upsilon states and B meson decays.

Notes and References

1. T. Bohringer et al. (CUSB Collaboration) . 1980 . Observation of ϒ, ϒ′, and ϒ′′ at the Cornell Electron Storage Ring . . 44 . 1111–1114 . 10.1103/PhysRevLett.44.1111. 1980PhRvL..44.1111B . 17.
2. G. Finocchiaro et al. (CUSB Collaboration) . 1980 . Observation of the ϒ′′′ at the Cornell Electron Storage Ring . . 45 . 222–225 . 10.1103/PhysRevLett.45.222. 1980PhRvL..45..222F . 4.