Title

Photon spectroscopy of heavy quarkonia

Date of Award

2004

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Advisor(s)

Tomasz Skwarnicki

Keywords

Quarkonia, Branching ratios, Bottomonium

Subject Categories

Physical Sciences and Mathematics | Physics

Abstract

We have studied the inclusive photon spectrum in [Special characters omitted.] (2 S ), Υ(2 S ), and Υ(3 S ) decays using the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates and photon energies for [Special characters omitted.] (2 S ) [arrow right] γχ cJ (1 P ), Υ(2 S ) [arrow right] γχ cJ (1 P ), and Υ(3 S ) [arrow right] γχ bJ (2 P ) ( J = 0, 1, 2). The rate for rare E1 transition, Υ(3 S ) [arrow right] γχ b0 (1 P ) is measured for the first time. We also confirm the hindered magnetic dipole (M1) transition, [Special characters omitted.] (2 S ) [arrow right] γη c (1 S ). However, the direct M1 transition [Special characters omitted.] (2 S ) [arrow right] γη c (2 S ) observed by the Crystal Ball as a narrow peak at a photon energy of 91 MeV is not found in our data.

We have also searched for the spin-singlet bottomonium states η b (1 S ) and η b (2 S ) via the hindered magnetic dipole (M1) photon transitions Υ(3 S ) [arrow right] γη b (1 S ), Υ(3 S ) [arrow right] γη b (2 S ); and Υ(2 S ) [arrow right] γη b (1 S ). No evidence for such transitions are found. We set upper limits on the branching ratios which rule out some of the theoretical calculations.

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