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We study the Upsilon(3S,2S)->eta Upsilon(1S) and Upsilon(3S,2S)->pi+pi-Upsilon(1S) transitions with 122 million Upsilon(3S) and 100 millionUpsilon(2S) mesons collected by the BaBar detector at the PEP-II asymmetricenergy e+e- collider. We measure B[Upsilon(2S)->etaUpsilon(1S)]=(2.39+/-0.31(stat.)+/-0.14(syst.))10^-4 and Gamma[Upsilon(2S)->etaUpsilon(1S)]/Gamma[Upsilon(2S)-> pi+pi-Upsilon(1S)]=(1.35+/-0.17(stat.)+/-0.08(syst.))10^-3. We find no evidence forUpsilon(3S)->eta Upsilon(1S) and obtain B[Upsilon(3S)->eta Upsilon(1S)]<1.010^-4 and Gamma[Upsilon(3S)->eta Upsilon(1S)]/Gamma[Upsilon(3S)->pi+pi-Upsilon(1S)]<2.3 10^-3 as upper limits at the 90% confidence level. We alsoprovide improved measurements of the Upsilon(2S) - Upsilon(1S) and Upsilon(3S)- Upsilon(1S) mass differences, 562.170+/-0.007(stat.)+/-0.088(syst.) MeV/c^2and 893.813+/-0.015(stat.)+/-0.107(syst.) MeV/c^2 respectively.

Study of Upsilon(3S,2S) -> eta Upsilon(1S) and Upsilon(3S,2S) -> pi+pi- Upsilon(1S) hadronic trasitions