Υ(4S) state
Besides the large signal (
Υ(10580)
)
at the
B
B
threshold
we find the
Υ(4S)
resonance
at
about
10.735
GeV.
data from BaBar Collaboration,
Phys. Rev. Lett. 102, 012001 (2009)
picture from ArXiv:0910.0967