First observation of exclusive $\Upsilon(1S)$ and $\Upsilon(2S)$ decays into light hadrons

Shen, C.P.; Yuan, C.Z.; Iijima, T.; Adachi, I.; Aihara, H.; Asner, D.M.; Aushev, T.; Bakich, A.M.; Bay, A.; Belous, K.

doi:10.1103/PhysRevD.86.031102

First observation of exclusive $\Upsilon(1S)$ and $\Upsilon(2S)$ decays into light hadrons

Belle

Collaboration

•

C.P. Shen
(
- Nagoya U.
)

May, 2012

7 pages

Published in:

Phys.Rev.D 86 (2012) 031102

e-Print:

1205.1246 [hep-ex]

DOI:

10.1103/PhysRevD.86.031102

PDG:

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

\rightarrow

{{\mathit \phi}}{{\mathit K}^{+}}{{\mathit K}^{-}}

Report number:

BELLE-PREPRINT-2012-14,
KEK-PREPRINT-2012-6

Experiments:

KEK-BF-BELLE

View in:

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reference search13 citations

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Abstract: (arXiv)

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 the three-body final states

\phi K^+ K^-

,

\omega \pi^+ \pi^-

and

K^{\ast 0}(892) K^- \pi^+

, and to the two-body Vector-Tensor (

\phi f_2'(1525)

,

\omega f_2(1270)

,

\rho a_2(1320)

and

K^{\ast 0}(892) \bar{K}_2^{\ast 0}(1430)

) and Axial-vector-Pseudoscalar (

K_1(1270)^+ K^-

,

K_1(1400)^+ K^-

and

b_1(1235)^+ \pi^-

) pairs. Signals are observed for the first time in the

\Upsilon(1S) \to \phi K^+ K^-

,

\omega \pi^+ \pi^-

,

K^{\ast 0} K^- \pi^+

,

K^{\ast0} K_2^{\ast 0}

and

\Upsilon(2S) \to \phi K^+ K^-

,

K^{\ast 0} K^- \pi^+

decay modes. Branching fractions are determined for all the processes, while 90% confidence level upper limits are established on the branching fractions for the modes with a statistical significance 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 OZI suppressed bottomonium decays.

Note:

7 pages, 5 figures, 1 table, accepted for publication as a Rapid Communication in Physical Review D

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

References(22)

Figures(44)

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First observation of exclusive Υ(1S)\Upsilon(1S)Υ(1S) and Υ(2S)\Upsilon(2S)Υ(2S) decays into light hadrons

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First observation of exclusive $\Upsilon(1S)$ and $\Upsilon(2S)$ decays into light hadrons