Evidence of $ϒ(1S) → J/ψ + χ_{c1}$ and search for double-charmonium production in ϒ(1S) and ϒ(2S) decays - INSPIRE

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Evidence of $ϒ(1S) → J/ψ + χ_{c1}$ and search for double-charmonium production in ϒ(1S) and ϒ(2S) decays

Belle

Collaboration

•

S.D. Yang
(
- Peking U.
)

Sep 26, 2014

9 pages

Published in:

Phys.Rev.D 90 (2014) 11, 112008

Published: Dec 16, 2014

e-Print:

1409.7644 [hep-ex]

DOI:

10.1103/PhysRevD.90.112008

PDG:

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

\rightarrow

{{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{{c}}}}

Report number:

BELLE-PREPRINT-#-2014-14,
KEK-PREPRINT-#:-2014-24

Experiments:

KEK-BF-BELLE

View in:

reference search10 citations

Citations per year

Abstract: (APS)

Using data samples of 102×106 ϒ(1S) and 158×106 ϒ(2S) events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays ϒ(1S,2S)→J/ψ(ψ′)+X, where X=ηc, χcJ(J=0,1,2), ηc(2S), X(3940), and X(4160). No significant signal is observed in the spectra of the mass recoiling against the reconstructed J/ψ or ψ′ except for the evidence of χc1 production with a significance of 4.6σ for ϒ(1S)→J/ψ+χc1. The measured branching fraction B(ϒ(1S)→J/ψ+χc1) is [3.90±1.21(stat)±0.23(syst)]×10−6. The 90% C.L. upper limits on the branching fractions of the other modes having a significance of less than 3σ are determined. These results are consistent with theoretical calculations using the nonrelativistic QCD factorization approach.

Note:

12 pages, 4 figures, 1 table. The fit range was extended to include X(4160) signal according to referee's suggestions. Other results unchanged. Paper was accepted for publication as a regular article in Physical Review D

14.40.Pq
13.25.Hw
13.25.Gv
electron positron: annihilation
BELLE
KEK-B
experimental results
upsilon mesons: hadronic decay
Upsilon(9460): branching ratio: measured
Upsilon(9460): branching ratio: upper limit

References(45)

Figures(18)

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