B(B)BAR SPECTROSCOPY FROM THE UPSILON(3S) STATE

Using the CUSB-II detector at CESR we have observed electric dipole transitions between the UPSILON and chi(b) states, both in exclusive and inclusive channels. We have measured their branching ratios and find B(UPSILON(3S)-->chi(b)(2P2,1,0)gamma)=(11.1+/-0.5+/-0.4)%, (11.5+/-0.5+/-0.5)%, (6.0+/-0.4+/-0.6)%. We have measured the center of gravity of the chi(b)(2P) states to be (10259.5+/-0.4+/-1.0) MeV and their fine-structure mass splittings to be (13.5+/-0.4+/-0.5) MeV between the J=2 and J=1 states and (23.5+/-0.7+/-0.7) MeV between J=1 and J=0, leading to a fine-structure ratio of 0.574+/-0.024+/-0.02. The measured fine-structure splitting implies that the spin-orbit interaction dominates over the tensor interaction and that the long-range confining potential is due to an effective scalar exchange. From the measured branching ratios we infer the hadronic widths of the chi(b)(2P) states and find them to be consistent with QCD predictions. We use them to derive values of alpha(s). We have observed the suppressed transition UPSILON(3S)-->chi(b)(1P)gamma and the pi-0-pi-0 transitions from the UPSILON(3S). We find B(UPSILON(3S)-->UPSILON(1S)pi-0-pi-0)=(2.2+/-0.4+/-0.3)% and B(UPSILON(3S)-->UPSILON(2S)pi-0-pi-0)=(1.7+/-0.5+/-0.2)%. We also present a measurement of the dipion invariant-mass spectrum from the transition UPSILON(3S)-->UPSILON(1S)pi-0-pi-0.