Search for (η_b) and (η_b^') in Inclusive Radiative Decays of the (Υ^') and (Υ^'').
Abstract
We have searched for possible production of the ground state of the b(barb) system, ( η b ) and its excited state, ( η_b^' ) in radiative decays of ( Υ^'' ) and ( Υ^' ) through the hindered magnetic dipole (M1) transitions (( Υ^'' arrow ) ((η _b) or ( η _b^')) + (γ )) and (( Υ^' arrow η _b+ γ )). Using the CLEO III detector, we have collected ( ∼ 1fb-1 ) of data on each of the ( Υ^'' ) and ( Υ^' ) resonances, corresponding to ( ∼4(6)×10^6) ( Υ^''(Υ^') ) decays. No significant evidence for such transitions were found. We set upper limits on B(( Υ^'' arrow ) (η _b) + ( γ )), B(( Υ^'' arrow ) ( η _b^') + ( γ )), and B(( Υ^' arrow ) (η _b) + ( γ )) which rule out many previously published phenomenological estimates of these branching fractions.
- Publication:
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APS April Meeting Abstracts
- Pub Date:
- April 2003
- Bibcode:
- 2003APS..APRP11003M