Using data samples with a total integrated luminosity of approximately 18 fb−1 collected by the BESIII detector operating at the Beijing Electron-Positron Collider II, the process e+e− →ΛΛ ̄η is studied at center-of-mass energies between 3.5106 and 4.6988 GeV. The Born cross section for the process e+e− → ΛΛ ̄η is measured. No significant structure is observed in the Born cross section line shape. An enhancement near the ΛΛ ̄ mass threshold is observed for the first time in the process. The structure can be described by an S-wave Breit-Wigner function. Neglecting contribution of excited Λ states and potential interferences, the mass and width are determined to be (2356 pm 7 pm 15) MeV/c2 and (304 pm 28 pm 54) MeV, respectively, where the first uncertainties are statistical and the second are systematic

Measurement of e+e−→ΛΛ¯η from 3.5106 to 4.6988 GeV and study of ΛΛ¯ mass threshold enhancement

Garzia, I.;Scodeggio, M.;
2023

Abstract

Using data samples with a total integrated luminosity of approximately 18 fb−1 collected by the BESIII detector operating at the Beijing Electron-Positron Collider II, the process e+e− →ΛΛ ̄η is studied at center-of-mass energies between 3.5106 and 4.6988 GeV. The Born cross section for the process e+e− → ΛΛ ̄η is measured. No significant structure is observed in the Born cross section line shape. An enhancement near the ΛΛ ̄ mass threshold is observed for the first time in the process. The structure can be described by an S-wave Breit-Wigner function. Neglecting contribution of excited Λ states and potential interferences, the mass and width are determined to be (2356 pm 7 pm 15) MeV/c2 and (304 pm 28 pm 54) MeV, respectively, where the first uncertainties are statistical and the second are systematic
2023
Ablikim, M.; Achasov, M.  N.; Adlarson, P.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M.  R.; An, Q.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Bal...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/11392/2530490
 Attenzione

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

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 1
social impact