Measurement of exclusive $\Upsilon(1S)$ and $\Upsilon(2S)$ decays into Vector-Pseudoscalar final states - INSPIRE

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Measurement of exclusive $\Upsilon(1S)$ and $\Upsilon(2S)$ decays into Vector-Pseudoscalar final states

Belle

Collaboration

•

C.P. Shen
(
- U. Bonn (main) and
- BeiHang U. and
- Charles U.
)

May 25, 2013

8 pages

Published in:

Phys.Rev.D 88 (2013) 1, 011102

Published: Jul 23, 2013

e-Print:

1305.5887 [hep-ex]

DOI:

10.1103/PhysRevD.88.011102

PDG:

{{\mathit \Upsilon}{(1S)}}

\rightarrow

{{\mathit \rho}}{{\mathit \pi}}

Report number:

BELLE-PREPRINT-2013-8,
KEK-PREPRINT-2013-6

Experiments:

KEK-BF-BELLE

View in:

reference search11 citations

Citations per year

Abstract: (APS)

Using samples of 102 million Υ(1S) and 158 million Υ(2S) events collected with the Belle detector, we study exclusive hadronic decays of these two bottomonium resonances to KS0K+π- and charge-conjugate (c.c.) states, π+π-π0π0, and π+π-π0, and to the two-body Vector-Pseudoscalar (K*(892)0K¯0+c.c., K*(892)-K++c.c., ωπ0, and ρπ) final states. For the first time, signals are observed in the modes Υ(1S)→KS0K+π-+c.c., π+π-π0π0, and Υ(2S)→π+π-π0π0, and evidence is found for the modes Υ(1S)→π+π-π0, K*(892)0K¯0+c.c., and Υ(2S)→KS0K+π-+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 3σ. The ratios of the branching fractions of Υ(2S) and Υ(1S) decays into the same final state are used to test a perturbative QCD prediction for Okubo-Zweig-Iizuka-suppressed bottomonium decays.

Note:

8 pages, 3 figures, 2 tables, accepted for publication as a Rapid Communication in Physical Review D

14.40.Pq
12.38.Qk
13.25.Gv
branching ratio: ratio
quantum chromodynamics: perturbation theory
Upsilon(10020): branching ratio: measured
Upsilon(9460): branching ratio: measured
BELLE
electron positron: annihilation
upsilon mesons: hadronic decay

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