First observation of the hadronic transition $ \Upsilon(4S) \to \eta h_{b}(1P)$ and new measurement of the $h_b(1P)$ and $\eta_b(1S)$ parameters - INSPIRE

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First observation of the hadronic transition $\Upsilon(4S) \to \eta h_{b}(1P)$ and new measurement of the $h_b(1P)$ and $\eta_b(1S)$ parameters

Belle

Collaboration

•

U. Tamponi
(
- INFN, Turin and
- Turin U.
)

Jun 29, 2015

7 pages

Published in:

Phys.Rev.Lett. 115 (2015) 14, 142001

Published: Sep 29, 2015

e-Print:

1506.08914 [hep-ex]

DOI:

10.1103/PhysRevLett.115.142001

PDG:

{{\mathit \Upsilon}{(4S)}}

\rightarrow

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

Report number:

BELLE-PREPRINT-2015-9,
KEK-PREPRINT-2015-6

Experiments:

KEK-BF-BELLE

View in:

reference search51 citations

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Abstract: (APS)

Using a sample of 771.6×106 ϒϒ(4S) decays collected by the Belle experiment at the KEKB e+e- collider, we observe, for the first time, the transition ϒ(4S)→ηhb(1P) with the branching fraction B[ϒ(4S)→ηhb(1P)]=(2.18±0.11±0.18)×10-3 and we measure the hb(1P) mass Mhb(1P)=(9899.3±0.4±1.0) MeV/c2, corresponding to the hyperfine (HF) splitting ΔMHF(1P)=(0.6±0.4±1.0) MeV/c2. Using the transition hb(1P)→γηb(1S), we measure the ηb(1S) mass Mηb(1S)=(9400.7±1.7±1.6) MeV/c2, corresponding to ΔMHF(1S)=(59.6±1.7±1.6) MeV/c2, the ηb(1S) width Γηb(1S)=(8-5+6±5) MeV/c2 and the branching fraction B[hb(1P)→γηb(1S)]=(56±8±4)%.

Note:

7 pages, 2 figures, submitted to Phys. Rev. Lett

14.40.Pq
12.38.Qk
12.39.Hg
13.20.Gd
electron positron: annihilation
electron positron: colliding beams
Upsilon(10570): hadronic decay
Upsilon(10570): branching ratio
eta/b(9402)
h/b(9899): mass

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Figures(2)

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