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Measurement of e+e−→ΛΛ¯η from 3.5106 to 4.6988 GeV and study of ΛΛ¯ mass threshold enhancement. / The BESIII Collaboration ; Николаев, Иван Борисович; Мучной, Николай Юрьевич.
в: Physical Review D, Том 107, № 11, 112001, 2023.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Measurement of e+e−→ΛΛ¯η from 3.5106 to 4.6988 GeV and study of ΛΛ¯ mass threshold enhancement
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. n.
AU - Николаев, Иван Борисович
AU - Мучной, Николай Юрьевич
N1 - Measurement of e+e−→ΛΛ¯η from 3.5106 to 4.6988 GeV and study of ΛΛ¯ mass threshold enhancement / The BESIII Collaboration // Physical Review D. – 2023. – Vol. 107, No. 11. – P. 112001. – DOI 10.1103/physrevd.107.112001. – EDN ITOIRZ.
PY - 2023
Y1 - 2023
N2 - 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 푒+푒− →Λ-¯Λ휂 is studied at center-of-mass energies between 3.5106 and 4.6988 GeV. The Born cross section for the process 푒+푒− →Λ¯Λ휂 is measured. No significant structure is observed in the Born cross section line shape. An enhancement near the Λ¯Λ mass threshold is observed for the first time in the process. The structure can be described by an 푆-wave Breit-Wigner function. Neglecting contribution of excited Λ states and potential interferences, the mass and width are determined to be (2356±7±15) MeV/푐2 and (304±28±54) MeV, respectively, where the first uncertainties are statistical and the second are systematic.
AB - 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 푒+푒− →Λ-¯Λ휂 is studied at center-of-mass energies between 3.5106 and 4.6988 GeV. The Born cross section for the process 푒+푒− →Λ¯Λ휂 is measured. No significant structure is observed in the Born cross section line shape. An enhancement near the Λ¯Λ mass threshold is observed for the first time in the process. The structure can be described by an 푆-wave Breit-Wigner function. Neglecting contribution of excited Λ states and potential interferences, the mass and width are determined to be (2356±7±15) MeV/푐2 and (304±28±54) MeV, respectively, where the first uncertainties are statistical and the second are systematic.
UR - https://www.elibrary.ru/item.asp?id=62909892
U2 - 10.1103/PhysRevD.107.112001
DO - 10.1103/PhysRevD.107.112001
M3 - Article
VL - 107
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 11
M1 - 112001
ER -
ID: 68329972