Observation of $P$ -Wave $b \bar{b}$ Bound States

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29 November 1982

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 49 (22) , 1612-1616
https://doi.org/10.1103/physrevlett.49.1612

Abstract

The existence of

P

-wave

b \bar{b}

bound states

{χ_{b}}^{'}

is demonstrated by observation of photons from the transition

ϒ^{''} \to γ + {χ_{b}}^{'}

in the inclusive photon spectrum from

ϒ^{''}

decays. The center of gravity of the observed photon energies is 98 MeV and the branching ratio for the transition of the

ϒ^{''}

to the

{χ_{b}}^{'}

states is (34±3)% (statistical).

Keywords

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