$\eta\pi^+\pi^-$ Resonant Structure around 1.8 GeV/$c^2$ and $\eta(1405)$ in $J/psi\to \omega\eta\pi^+\pi^-$

Ablikim, M.; Achasov, M.N.; Alberto, D.; An, Q.; An, Z.H.; Bai, J.Z.; Baldini, R.; Ban, Y.; Becker, J.; Berger, N.

doi:10.1103/PhysRevLett.107.182001

$\eta\pi^+\pi^-$ Resonant Structure around 1.8 GeV/ $c^2$ and $\eta(1405)$ in $J/psi\to \omega\eta\pi^+\pi^-$

BESIII

Collaboration

Jul, 2011

6 pages

Published in:

Phys.Rev.Lett. 107 (2011) 182001

e-Print:

1107.1806 [hep-ex]

DOI:

10.1103/PhysRevLett.107.182001

PDG:

{{\mathit f}_{{{1}}}{(1285)}}

MASS

Experiments:

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Abstract: (arXiv)

We present results of a study of the decay

J/\psi\rightarrow\omega\eta\pi^+\pi^-

using a sample of

(225.2\pm2.8)\times10^6

J/\psi

events collected by the BESIII detector, and report the observation of a new process of

J/\psi\rightarrow \omega X(1870)

in which X(1870) decays to

a_0(980)\pi

. The statistical significance of this process is larger than

7.2\sigma

. Signals for

J/\psi\rightarrow \omega f_1(1285)

and

J/\psi\rightarrow \omega\eta(1405)

are also observed in

\eta\pi^+\pi^-

spectrum, with statistical significances much larger than

10\sigma

.

Note:

6 pages, 7 figures

13.85.Hd
13.25.Ft
25.75.Gz
J/psi(3100): hadronic decay
pi: pair production
eta(1405)
BES
electron positron: annihilation
omega(783): hadronic decay
eta: radiative decay

References(24)

Figures(7)

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ηπ+π−\eta\pi^+\pi^-ηπ+π− Resonant Structure around 1.8 GeV/c2c^2c2 and η(1405)\eta(1405)η(1405) in J/psi→ωηπ+π−J/psi\to \omega\eta\pi^+\pi^-J/psi→ωηπ+π−

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$\eta\pi^+\pi^-$ Resonant Structure around 1.8 GeV/ $c^2$ and $\eta(1405)$ in $J/psi\to \omega\eta\pi^+\pi^-$