Observation of a structure at 1.84 GeV/$c^2$ in the 3($π^+π^-$) mass spectrum in J/ψ→γ3($π^+π^-$) decays - INSPIRE

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Observation of a structure at 1.84 GeV/ $c^2$ in the 3( $π^+π^-$ ) mass spectrum in J/ψ→γ3( $π^+π^-$ ) decays

BESIII

Collaboration

May 23, 2013

6 pages

Published in:

Phys.Rev.D 88 (2013) 9, 091502

Published: Nov 14, 2013

e-Print:

1305.5333 [hep-ex]

DOI:

10.1103/PhysRevD.88.091502

PDG:

{{\mathit \eta}^{\,'}{(958)}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Experiments:

View in:

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Abstract: (APS)

With a sample of 225.3×106 J/ψ events taken with the BESIII detector, the decay J/ψ→γ3(π+π-) is analyzed. A structure at 1.84 GeV/c2 is observed in the 3(π+π-) invariant mass spectrum with a statistical significance of 7.6σ. The mass and width are measured to be M=1842.2±4.2-2.6+7.1 MeV/c2 and Γ=83±14±11 MeV. The product branching fraction is determined to be B(J/ψ→γX(1840))×B(X(1840)→3(π+π-))=(2.44±0.36-0.74+0.60)×10-5. No η′ signals are observed in the 3(π+π-) invariant mass spectrum, and the upper limit of the branching fraction for the decay η′→3(π+π-) is set to be 3.1×10-5 at a 90% confidence level.

Note:

6 pages, 3 figures, minor changes, to be appeared in journal

13.20.Gd
12.39.Mk
eta(958): branching ratio: upper limit
B: branching ratio: upper limit
J/psi(3100)
branching ratio
mass spectrum: (3pi+ 3pi-)
BES
mass enhancement
experimental results

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Figures(3)

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