Measurement of $e^{+}e^{-}\rightarrow \pi^{+}\pi^{-}\psi(3686)$ from 4.008 to 4.600~GeV and observation of a charged structure in the $\pi^{\pm}\psi(3686)$ mass spectrum - INSPIRE

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Measurement of $e^{+}e^{-}\rightarrow \pi^{+}\pi^{-}\psi(3686)$ from 4.008 to 4.600~GeV and observation of a charged structure in the $\pi^{\pm}\psi(3686)$ mass spectrum

BESIII

Collaboration

•

M. Ablikim
(
- Beijing, Inst. High Energy Phys.
)

Mar 26, 2017

11 pages

Published in:

Phys.Rev.D 96 (2017) 3, 032004,
Phys.Rev.D 99 (2019) 1, 019903 (erratum)

Published: Aug 31, 2017 by APS

e-Print:

1703.08787 [hep-ex]

DOI:

10.1103/PhysRevD.96.032004,
10.1103/PhysRevD.99.019903 (erratum)

PDG:

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

\rightarrow

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

Experiments:

BEPC-BES-III

View in:

reference search135 citations

Citations per year

Abstract: (APS)

We study the process e+e-→π+π-ψ(3686) using 5.1 fb-1 of data collected at 16 center-of-mass energy (s) points from 4.008 to 4.600 GeV by the BESIII detector operating at the BEPCII collider. The measured Born cross sections for e+e-→π+π-ψ(3686) are consistent with previous results, but with much improved precision. A fit to the cross section shows contributions from two structures: the first has M=4209.5±7.4±1.4 MeV/c2 and Γ=80.1±24.6±2.9 MeV, and the second has M=4383.8±4.2±0.8 MeV/c2 and Γ=84.2±12.5±2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is observed in the process e+e-→π+π-ψ(3686) for the first time with a statistical significance of 5.8σ. A charged charmoniumlike structure is observed in the π±ψ(3686) invariant mass spectrum for data at s=4.416 GeV. A fit with an S-wave Breit-Wigner function yields a mass M=4032.1±2.4 MeV/c2, where the errors are statistical only. However, there are still unresolved discrepancies between the fit model and data. The width of the intermediate state varies in a wide range for different kinematic regions within the data set. Therefore, no simple interpretation of the data has been found, and a future data sample with larger statistics and more theoretical input will be required to better understand this issue.

electron positron: annihilation
electron positron: colliding beams
psi(3685): electroproduction
pi: pair production
structure
mass spectrum: (pi+ psi(3685))
mass: width
statistical
Beijing Stor
Breit-Wigner

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Figures(34)

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