(2008) Study of hadronic transitions between Y states and observation of Y(4S) -> eta Y(1S) decay. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.78 (No.11). article no.112002. doi:10.1103/PhysRevD.78.112002

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Abstract

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).

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Official Date:	December 2008
Dates:	Date Event December 2008 UNSPECIFIED
Volume:	Vol.78
Number:	No.11
Number of Pages:	11
Page Range:	article no.112002
DOI:	10.1103/PhysRevD.78.112002
Status:	Peer Reviewed
Publication Status:	Published

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