We present a study of hadronic transitions between Y(mS) (m = 4, 3, 2) and Y(nS) (n = 2, 1) resonances based on 347.5 fb(-1) of data taken with the BABAR detector at the PEP-II storage rings. We report the first observation of Y(4S) -> eta Y(1S) decay with a branching fraction B(Y(4S) -> eta Y(1S) = (1.96 +/- 0.06(stat) +/- 0.09(syst)) X 10(-4) and measure the ratio of partial widths Gamma(Y(4S) -> eta Y(1S))/Gamma(Y(4S) -> pi(+)pi(-)Y(1S)) = 2.41 +/- 0.40(stat) +/- 0.12(syst). We set 90% CL upper limits on the ratios Gamma(Y(2S) -> eta Y(1S))/Gamma(Y(2S) -> pi(+)pi(-)Y(1S) < 5.2 X 10(-3) and Gamma(Y(3S) -> eta Y(1S)/Gamma(Y(3S) -> pi(+)pi(-)Y(1S)) < 1.9 X 10(-2). We also present new measurements of the ratios Gamma(Y(4S) -> pi(+)pi(-)Y(2S)/Gamma(Y(4S) -> pi(+)pi(-)Y(1S)) = 1.16 +/- 0.16(stat) +/- 0.14(syst) and Gamma(Y(3S) -> pi(+)pi(-)Y(1S)) = 0.577 +/- 0.026(stat) +/- 0.060(syst).
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M.; Roney J. M.; Sobie R. J.; Gershon T. J.; Harrison P. F.; Ilic J.; Latham T. E.; Mohanty G. B.; Band H. R.; Chen X.; Dasu S.; Flood K. T.; Kutter P. E.; Pan Y.; Pierini M.; Prepost R.; Vuosalo C. O.; Wu S. L. |
Titolo: | Study of hadronic transitions between Y states and observation of Y(4S) -> eta Y(1S) decay RID C-5223-2009 |
Anno del prodotto: | 2008 |
Digital Object Identifier (DOI): | 10.1103/PhysRevD.78.112002 |
Appare nelle tipologie: | 1.1 Articolo in rivista |