Evidence for e+e-→γηc (1S) at center-of-mass energies between 4.01 and 4.60 GeV /M. Ablikim, M. N. Achasov, S. Ahmed [et al.]

Электронный ресурс
Другой Автор
Achasov, M. N.
Ahmed, S.
Chelkov, G. A.
Ablikim, M.
Источник
Physical Review D 2017 Vol. 96, № 5. P. 051101-1-051101-8
Аннотация
We present first evidence for the process e+e−→γηc(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 ηc(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 σpeak(e+e−→γηc(1S))=2.11±0.49(stat.)±0.36(syst.)  pb with a statistical significance of 4.2σ.
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$a We present first evidence for the process e+e−→γηc(1S) at six center-of-mass energies between 4.01 and 4.60 GeV using data collected by the BESIII experiment operating at BEPCII. We measure the Born cross section at each energy using a combination of twelve ηc(1S) decay channels. We also combine all six energies under various assumptions for the energy-dependence of the cross section. If the process is assumed to proceed via the Y(4260), we measure a peak Born cross section σpeak(e+e−→γηc(1S))=2.11±0.49(stat.)±0.36(syst.)  pb with a statistical significance of 4.2σ.
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$a Chelkov, G. A.
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Предмет
статьи в журналах
Резюме
We present first evidence for the process e+e−→γηc(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 ηc(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 σpeak(e+e−→γηc(1S))=2.11±0.49(stat.)±0.36(syst.)  pb with a statistical significance of 4.2σ.