Measurement of exclusive Upsilon(1S) and Upsilon(2S) decays into vector-pseudoscalar final states
- Title
- Measurement of exclusive Upsilon(1S) and Upsilon(2S) decays into vector-pseudoscalar final states
- Author
- 천병구
- Keywords
- BELLE; IDENTIFICATION; MESON; KEKB
- Issue Date
- 2013-07
- Publisher
- AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
- Citation
- PHYSICAL REVIEW D,2013,88(1),p8
- Abstract
- Using samples of 102 million Upsilon(1S) and 158 million Upsilon(2S) events collected with the Belle detector, we study exclusive hadronic decays of these two bottomonium resonances to (KSK+)-K-0 pi(-) and charge-conjugate (c.c.) states, pi(+) pi(-) pi(0) pi(0), and pi(+) pi(-) pi(0), and to the two-body Vector-Pseudoscalar (K*(892)0 (K) over bar (0) + c.c., K*(892)K--(+) + c.c., omega pi(0), and rho pi) final states. For the first time, signals are observed in the modes Upsilon(1S) -> K-S(0) K+ pi(-) + c.c., pi(+) pi(-) pi(0) pi(0), and Upsilon(2S) -> pi(+) pi(-) pi(0) pi(0), and evidence is found for the modes Upsilon(1S) -> pi(+) pi(-) pi(0), K-*(892)(0)(K) over bar (0) + c.c., and Upsilon(2S) -> K-S(0) K+ pi(-) + c.c. Branching fractions are measured for all the processes, while 90% confidence level upper limits on the branching fractions are also set for the modes with a statistical significance of less than 3 sigma. The ratios of the branching fractions of Upsilon(2S) and Upsilon(1S) decays into the same final state are used to test a perturbative QCD prediction for Okubo-Zweig-Iizuka- suppressed bottomonium decays.
- URI
- http://journals.aps.org/prd/abstract/10.1103/PhysRevD.88.011102http://hdl.handle.net/20.500.11754/44072
- ISSN
- 1550-7998
- DOI
- 10.1103/PhysRevD.88.011102
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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