Title

Measurement of the mass splittings between the bb̄χb,J(1P) states

Document Type

Article

Publication Date

2-1-1999

Abstract

We present new measurements of photon energies and branching fractions for the radiative transitions Y(2S)→γχ (1P). The masses of the χ states are determined from the measured radiative photon energies. The ratio of mass splittings between the χ substates, r≡(M -M )/(M -M ), with M the χ mass, provides information on the nature of the bb̄ confining potential. We find r(1P)=0.542 ±0.022±0.024. This value is somewhat lower than the previous world average, but more consistent with the theoretical expectation that r(1P)

Publication Name

Physical Review D - Particles, Fields, Gravitation and Cosmology

Volume Number

59

First Page

1

Last Page

5

Issue Number

3

Article

032003

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