Observation of the Upsilon(2 3D1) and indication of the Upsilon(1 3D1)

Understand

We present evidence, from published BABAR data, for the existence of further excitations in the b-bbar spectrum, namely the long-awaited Upsilon(1D) and Upsilon(2D) with central masses of 10098 pm 5 MeV and 10492 pm 5 MeV, respectively.

• The significance of the Upsilon(1 3D1) and Upsilon(2 3D1) signals is found to be 3.0 and 10.7 standard deviations, respectively.