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Evidence for e+e−→γηc(1S) at center-of-mass energies between 4.01 and 4.60 GeV
Inst High Energy Phys, Beijing 100049, Peoples R China..
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
Helmholtz Inst Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany..
Ruhr Univ Bochum, D-44780 Bochum, Germany..
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2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 5, 051101Article in journal (Refereed) Published
Abstract [en]

We present first evidence for the process e(+)e(-) -> gamma eta(c)(1S) at six center-of-mass energies between 4.01 and 4.60 GeV using data collected by the BESIII experiment operating at BEPCII. We measure the Born cross section at each energy using a combination of twelve eta(c)(1S) decay channels. We also combine all six energies under various assumptions for the energy-dependence of the cross section. If the process is assumed to proceed via the Y(4260), we measure a peak Born cross section sigma(peak)(e(+)e(-) -> gamma eta(c)(1S)) = 2.11 +/- 0.49 (stat.) +/- 0.36 (syst.) pb with a statistical significance of 4.2 sigma.

Place, publisher, year, edition, pages
2017. Vol. 96, no 5, 051101
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-335210DOI: 10.1103/PhysRevD.96.051101ISI: 000409433900001OAI: oai:DiVA.org:uu-335210DiVA: diva2:1162299
Note

Title in WoS: Evidence for e(+)e(-) -> gamma eta(c)(1S) at center-of-mass energies between 4.01 and 4.60 GeV

Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2017-12-04Bibliographically approved

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejLi, CuiPapenbrock, MichaelPettersson, JoachimSchönning, KarinWolke, Magnus

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Physical Review D: covering particles, fields, gravitation, and cosmology
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