Observation and study of the decay $J/\psi\rightarrow\phi\eta\eta'$ - INSPIRE

DataBETA

Observation and study of the decay $J/\psi\rightarrow\phi\eta\eta'$

BESIII

Collaboration

Dec 31, 2018

10 pages

Published in:

Phys.Rev.D 99 (2019) 11, 112008

Published: Jun 19, 2019

e-Print:

1901.00085 [hep-ex]

DOI:

10.1103/PhysRevD.99.112008

PDG:

{{\mathit J / \psi}{(1S)}}

\rightarrow

{{\mathit \phi}}{{\mathit \eta}}{{\mathit \eta}^{\,'}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

reference search29 citations

Citations per year

Abstract: (APS)

We report the observation and study of the decay J/ψ→ϕηη′ using 1.3×109 J/ψ events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be (2.32±0.06±0.16)×10-4. We also report evidence for a structure, denoted as X, in the ϕη′ mass spectrum in the 2.0–2.1 GeV/c2 region. Using two decay modes of the η′ meson (γπ+π- and ηπ+π-), a simultaneous fit to the ϕη′ mass spectra is performed. Assuming the quantum numbers of the X to be JP=1-, its significance is found to be 4.4σ, with a mass and width of (2002.1±27.5±21.4) MeV/c2 and (129±17±9) MeV, respectively, and a product branching fraction B(J/ψ→ηX)×B(X→ϕη′)=(9.8±1.2±1.7)×10-5. Alternatively, assuming JP=1+, the significance is 3.8σ, with a mass and width of (2062.8±13.1±7.2) MeV/c2 and (177±36±35) MeV, respectively, and a product branching fraction B(J/ψ→ηX)×B(X→ϕη′)=(9.6±1.4±2.0)×10-5. The angular distribution of J/ψ→ηX is studied and the two JP assumptions of the X cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic.

13.25.Gv
13.66.Bc
14.40.Rt
Particle Physics Experiments
electron positron: annihilation
electron positron: colliding beams
J/psi(3100): electroproduction
J/psi(3100): hadronic decay
J/psi(3100): branching ratio: measured
Phi(1020)

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Figures(6)

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