First Observation of a Upsilon(1D) State

Abstract

We present the first evidence for the production of Upsilon(1D) states in the four-photon cascade, Upsilon(3S)-->gamma chib(2P), chib(2P)-->gamma Upsilon(1D), Upsilon(1D)-->gamma chib(1P), chib(1P)-->gamma Upsilon(1S), followed by the Upsilon(1S) annihilation into e+e- or mu+mu-. The signal has a significance of 10.2 standard deviations. The measured product branching ratio for these five decays, (2.5+-0.5+-0.5)x10^(-5), is consistent with the theoretical estimates. The data are dominated by the production of one Upsilon(1D) state consistent with the J=2 assignment. Its mass is determined to be (10161.1+-0.6+-1.6) MeV, which is consistent with the predictions from potential models and lattice QCD calculations. We also searched for Upsilon(3S)-->gammachib(2P), chib(2P)-->gammaUpsilon(1D), followed by either Upsilon(1D)-->eta Upsilon(1S) or Upsilon(1D)-->pi+pi- Upsilon(1S). We find no evidence for such decays and set upper limits on the product branching ratios.

12 pages postscript,also available through this http://w4.lns.cornell.edu/public/CLNS/, submitted to PRD

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• Heavy Quarkonium
• The enhancement of the decay Upsilon(1D) -> eta Upsilon(1S) by the axial anomaly in QCD
• Results on improved KS dynamical configurations: spectrum, decay constants, etc
• Prospects for detection of ${\rm Y}(1D)\to {\rm Y}(1S)\pi \pi$ via ${\rm Y}(3S)\to {\rm Y}(1D)+X$

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