Study of $e^+e^- → π^+ π^- J/ψ$ and Observation of a Charged Charmoniumlike State at Belle

Liu, Z.Q.; Shen, C.P.; Yuan, C.Z.; Adachi, I.; Aihara, H.; Asner, D.M.; Aulchenko, V.; Aushev, T.; Aziz, T.; Bakich, A.M.

doi:10.1103/PhysRevLett.110.252002

Study of $e^+e^- → π^+ π^- J/ψ$ and Observation of a Charged Charmoniumlike State at Belle

Belle

Collaboration

•

Z.Q. Liu
(
- Beijing, Inst. High Energy Phys.
)

Mar 30, 2013

7 pages

Published in:

Phys.Rev.Lett. 110 (2013) 252002,
Phys.Rev.Lett. 111 (2013) 019901 (erratum)

Published: Jun 17, 2013

e-Print:

1304.0121 [hep-ex]

DOI:

10.1103/PhysRevLett.110.252002,
10.1103/PhysRevLett.111.019901 (erratum)

PDG:

{{\mathit \psi}{(4230)}}

\rightarrow

{{\mathit e}^{+}}{{\mathit e}^{-}}

Report number:

BELLE-PREPRINT-2013-6,
KEK-PREPRINT-2013-2

Experiments:

KEK-BF-BELLE

View in:

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reference search957 citations

Citations per year

Abstract: (APS)

The cross section for e+e-→π+π-J/ψ between 3.8 and 5.5 GeV is measured with a 967 fb-1 data sample collected by the Belle detector at or near the Υ(nS) (n=1,2,…,5) resonances. The Y(4260) state is observed, and its resonance parameters are determined. In addition, an excess of π+π-J/ψ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the Y(4008) state that was previously reported by Belle. In a study of Y(4260)→π+π-J/ψ decays, a structure is observed in the M(π±J/ψ) mass spectrum with 5.2σ significance, with mass M=(3894.5±6.6±4.5) MeV/c2 and width Γ=(63±24±26) MeV/c2, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.

Note:

10 pages, 5 figures, 2 tables, accepted by Phys. Rev. Lett

14.40.Pq
13.66.Bc
13.25.Gv
14.40.Rt
BELLE
Y(4260): hadronic decay
Breit-Wigner
mass spectrum: (J/psi(3100) pi)
Y(4008)
electron positron: annihilation

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Figures(8)

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Study of e+e−→π+π−J/ψe^+e^- → π^+ π^- J/ψe+e−→π+π−J/ψ and Observation of a Charged Charmoniumlike State at Belle

Citations per year

Study of $e^+e^- → π^+ π^- J/ψ$ and Observation of a Charged Charmoniumlike State at Belle