Phys. Rev. D 99, 012003 (2019) - Measurements of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{0}$ and ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}\ensuremath{\eta}$ at center-of-mass energies from 3.90 to 4.60 GeV

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Measurements of $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0}$ and $K_{S}^{0} K^{\pm} π^{\mp} η$ at center-of-mass energies from 3.90 to 4.60 GeV

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 99, 012003 – Published 9 January 2019

Abstract

Using $5.2 {fb}^{- 1}$ $e^{+} e^{-}$ annihilation data samples collected with the BESIII detector, we measure the cross sections of $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0}$ and $K_{S}^{0} K^{\pm} π^{\mp} η$ at center-of-mass energies from 3.90 to 4.60 GeV. In addition, we search for the charmoniumlike resonance $Y (4260)$ decays into $K_{S}^{0} K^{\pm} π^{\mp} π^{0}$ and $K_{S}^{0} K^{\pm} π^{\mp} η$ , and $Z_{c}^{0, \pm} (3900)$ decays into $K_{S}^{0} K^{\pm} π^{\mp, 0}$ and $K_{S}^{0} K^{\pm} η$ . Corresponding upper limits are provided since no clear signal is observed.

Received 23 October 2018

DOI:https://doi.org/10.1103/PhysRevD.99.012003

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Hadronic decays Particle production

Particles & Fields

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Vol. 99, Iss. 1 — 1 January 2019

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Figure 1
The distributions of $M (π^{+} π^{-})$ versus $M (γ γ)$ at $\sqrt{s} = 4.258 GeV$ and the projections onto $M (π^{+} π^{-})$ and $M (γ γ)$ . (a) is the $π^{0}$ mode; (b) is the $η$ mode; (c) is the $M (π^{+} π^{-})$ ; (d) is the $M (γ γ)$ . In plots (a) and (b), the boxes with mark “A” are the signal region and the boxes with marks “B” and “C” are sideband regions. In plots (c) and (d), the black error bars are the data, the green solid line is the PHSP MC simulation, the red arrows denote the signal regions, and the blue arrows denote the sideband regions.
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Figure 2
Some invariant mass (M) distributions of two or three final state particles (a) –(f), momentum (P) distributions of final state particles (g),(h), polar angle ( $θ$ ) distributions of final state particles (i),(j), in process $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0}$ at 4.258 GeV as examples. The black dots with error bars are the data. The red solid lines are the mixing MC sample. The blue dashed lines are the PHSP MC sample. The pink dash-dotted lines in plot (i) and plot (j) are the MC shape of the $Z_{c} (3900)$ with an arbitrary scale.
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Figure 3
Some invariant mass (M) distributions of two or three final state particles (a)–(f), momentum (P) distributions of final state particles (g),(h), polar angle ( $θ$ ) distributions of final state particles (i),(j), in process $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} η$ at 4.258 GeV as examples. The black dots with error bars are the data. The red solid lines are the mixing MC sample. The blue dashed lines are the PHSP MC sample. The pink dash-dotted lines in plot (i) are the MC shape of the $Z_{c} (3900)$ with an arbitrary scale.
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Figure 4
Line shapes of Born cross sections for $e^{+} e^{-} \to K_{S}^{0} K π π^{0}$ (a), and $e^{+} e^{-} \to K_{S}^{0} K π η$ (b). The dots with error bars are the measured Born cross sections. The solid red lines are the fitted results with the function $f (\sqrt{s}) = \frac{p_{0}}{(\sqrt{s})^{p_{1}}}$ and parameters $p_{0} = (6.14 \pm 1.54) \times 10^{6} (pb) \cdot (GeV)^{p_{1}}$ and $p_{1} = 6.68 \pm 0.17$ in the $π^{0}$ mode and $p_{0} = (1.86 \pm 0.97) \times 10^{5} (pb) \cdot {(GeV)}^{p_{1}}$ and $p_{1} = 6.56 \pm 0.36$ in the $η$ mode. The pink dash-dotted lines are the MC shape of the $Y (4260)$ with an arbitrary scale factor.
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Figure 5
The optimal fit for (a) $Z_{c} (3900)^{0} \to K_{S}^{0} K^{\pm} π^{\mp}$ , (b) $Z_{c} (3900)^{\pm} \to K_{S}^{0} K^{\pm} π^{0}$ , and (c) $Z_{c} (3900)^{\pm} \to K_{S}^{0} K^{\pm} η$ (at $\sqrt{s} = 4.258 GeV$ as examples). The black error bars are the data, the black solid lines are the fit curve, the green dashed lines denote the background shape, and the red dashed lines denote the signal shape.
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Physical Review D

covering particles, fields, gravitation, and cosmology

Measurements of $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0}$ and $K_{S}^{0} K^{\pm} π^{\mp} η$ at center-of-mass energies from 3.90 to 4.60 GeV

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 99, 012003 – Published 9 January 2019

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Physical Review D

covering particles, fields, gravitation, and cosmology

Measurements of e+e−→KS0K±π∓π0 and KS0K±π∓η at center-of-mass energies from 3.90 to 4.60 GeV

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 99, 012003 – Published 9 January 2019

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Measurements of $e^{+} e^{-} \to K_{S}^{0} K^{\pm} π^{\mp} π^{0}$ and $K_{S}^{0} K^{\pm} π^{\mp} η$ at center-of-mass energies from 3.90 to 4.60 GeV