Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-06-03
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 6 figures, contribution to the conference "XLIIIth Rencontres de Moriond, QCD and High Energy Interactions"
Scientific paper
After nine years of operation the BABAR experiment at the B factory PEPII (Standford Linear Accelerator Center) stopped data taking in April 2008. The last three month of data taking were devoted to e+e- collisions at center of mass energies of the Upsilon(2S), Upsilon(3S) and to an energy scan above the Upsilon(4S). Besides the observation of the bottomonium ground state eta_b, the center of mass energy dependent e+e- -> b bbar cross section was measured in the energy range from 10.54 to 11.20 GeV. BELLE observed an enhancement in the production cross section for e+e- -> Upsilon(nS) pi+ pi- -> mu+ mu- pi+ pi- in an energy scan from 10.83 to 11.02 GeV.
for the BABAR Collaboration
Marks Joerg
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