Search for bottomonium states in exclusive radiative Υ(2S) decays.
Phys Rev Lett
; 111(11): 112001, 2013 Sep 13.
Article
in En
| MEDLINE
| ID: mdl-24074074
ABSTRACT
We search for bottomonium states in Υ(2S) â (bb)γ decays with an integrated luminosity of 24.7 fb(-1) recorded at the Υ(2S) resonance with the Belle detector at KEK, containing (157.8±3.6)×10(6) Υ(2S) events. The (bb) system is reconstructed in 26 exclusive hadronic final states composed of charged pions, kaons, protons, and K(S)(0) mesons. We find no evidence for the state recently observed around 9975 MeV (X(bb)) in an analysis based on a data sample of 9.3×10(6) Υ(2S) events collected with the CLEO III detector. We set a 90% confidence level upper limit on the branching fraction B[Υ(2S) â X(bb)γ] × ∑(i)B[X(bb) â h(i)] < 4.9×10(-6), summed over the exclusive hadronic final states employed in our analysis. This result is an order of magnitude smaller than the measurement reported with CLEO data. We also set an upper limit for the ηb(1S) state of B[Υ(2S) â ηb(1S)γ] × ∑(i)B[ηb(1S) â h(i)] < 3.7×10(-6).
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Elementary Particle Interactions
/
Models, Theoretical
/
Nuclear Physics
Type of study:
Health_economic_evaluation
Language:
En
Journal:
Phys Rev Lett
Year:
2013
Type:
Article