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 σ_peak(e+e− → γ eta_c(1S)) = 2.11 pm 0.49(stat.) pm 0.36(cyst.) pb with a statistical significance of 4.2σ.

Evidence for e+e−→γηc(1S) at center-of-mass energies between 4.01 and 4.60 GeV

FARINELLI, Riccardo;GARZIA, Isabella;MEZZADRI, Giulio;
2017

Abstract

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 σ_peak(e+e− → γ eta_c(1S)) = 2.11 pm 0.49(stat.) pm 0.36(cyst.) pb with a statistical significance of 4.2σ.
2017
Ablikim, M.; Achasov, M.  . n.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F.  . f.; An, Q.; Bai, J.  . z.; Bai, Y.; Bakina, O.; Baldini ...espandi
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2375844
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 11
social impact