Observation of a Vector Charmoniumlike State at <math display="inline"><mrow><mn>4.7</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> and Search for <math display="inline"><mrow><msub><mrow><mi>Z</mi></mrow><mrow><mi>c</mi><mi>s</mi></mrow></msub></mrow></math> in <math display="inline"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>-</mo></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>K</mi></mrow><mrow><mo>-</mo></mrow></msup><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math>

collected at center-of-mass energies from 4.61 to 4.95 GeV with the BESIII detector operating at the BEPCII storage ring, we measure the cross section for the process

e^{+} e^{-} \to K^{+} K^{-} J / ψ

. A new resonance with a mass of

M = 470 8_{- 15}^{+ 17} \pm 21 MeV / c^{2}

and a width of

Γ = 12 6_{- 23}^{+ 27} \pm 30 MeV

is observed in the energy-dependent line shape of the

e^{+} e^{-} \to K^{+} K^{-} J / ψ

cross section with a significance over

5 σ

. The

K^{+} J / ψ

system is also investigated to search for charged charmoniumlike states, but no significant

Z_{c s}^{+}

states are observed. Upper limits on the Born cross sections for

e^{+} e^{-} \to K^{-} Z_{c s} (3985)^{+} / K^{-} Z_{c s} (4000)^{+} + c . c .

with

Z_{c s} (3985)^{\pm} / Z_{c s} (4000)^{\pm} \to K^{\pm} J / ψ

are reported at 90% confidence levels. The ratio of branching fractions

{[B (Z_{c s} (3985)^{+} \to K^{+} J / ψ)] / B [Z_{c s} (3985)^{+} \to ({\bar{D}}^{0} D_{s}^{* +} + {\bar{D}}^{* 0} D_{s}^{+})]}

is measured to be less than 0.03 at 90% confidence level.

electron positron: annihilation
electron positron: colliding beams
resonance: production
narrow resonance
K: pair production
J/psi(3100): associated production
mass: width
resonance: mass: measured
resonance: width
width: measured

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Observation of a Vector Charmoniumlike State at 4.7 GeV/c2 and Search for Zcs in e+e-→K+K-J/ψ

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Observation of a Vector Charmoniumlike State at $4.7 GeV / c^{2}$ and Search for $Z_{c s}$ in $e^{+} e^{-} \to K^{+} K^{-} J / ψ$