Cross section measurement of <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><mi>η</mi><mi>ψ</mi><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></mrow></math> and search for <math display="inline"><mrow><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><mi>η</mi><mover accent="true"><mrow><mi>X</mi></mrow><mrow><mo stretchy="false">˜</mo></mrow></mover></mrow><mo stretchy="false">(</mo><mn>3872</mn><mo stretchy="false">)</mo></mrow></math>

is measured at 18 center of mass energies from 4.288 to 4.951 GeV using the BESIII detector. Using the same data samples, we also perform the first search for the reaction

e^{+} e^{-} \to η \tilde{X} (3872)

, but no evidence is found for the

\tilde{X} (3872)

in the

π^{+} π^{-} J / ψ

mass distribution. At each of the 18 center of mass energies, upper limits at the 90% confidence level on the cross section for

e^{+} e^{-} \to η ψ (2 S)

and on the product of the

e^{+} e^{-} \to η \tilde{X} (3872)

cross section with the branching fraction of

\tilde{X} (3872) \to π^{+} π^{-} J / ψ

are reported.

electron positron: annihilation
electron positron: colliding beams
eta: associated production
channel cross section: energy dependence
psi(3685): associated production
X(3872): hadronic decay
mass spectrum: (pi+ pi- J/psi(3100))
BES
Beijing Stor
channel cross section: branching ratio: upper limit

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Cross section measurement of e+e-→ηψ(2S) and search for e+e-→ηX˜(3872)

Citations per year

Cross section measurement of $e^{+} e^{-} \to η ψ (2 S)$ and search for $e^{+} e^{-} \to η \tilde{X} (3872)$