Using data samples with an integrated luminosity of 22.42  fb^-1 collected by the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the 𝑒+⁢𝑒−→𝜂⁢𝐽/𝜓 process at center-of-mass energies from 3.808 to 4.951 GeV. Three structures are observed in the line shape of the measured cross sections. A maximum-likelihood fit with 𝜓⁡(4040), two additional resonances, and a nonresonant component are performed. The mass and width of the first additional state are (4219.7±2.5±4.5)  MeV/𝑐2 and (80.7±4.4±1.4)  MeV, respectively, consistent with the 𝜓⁡(4230). For the second state, the mass and width are (4386±13±17)  MeV/𝑐2 and (177±32±13)  MeV, respectively, consistent with the 𝜓⁡(4360). The first uncertainties are statistical, and the second ones are systematic. The statistical significance of 𝜓⁡(4040) is 8.0⁢𝜎 and those for 𝜓⁡(4230) and 𝜓⁡(4360) are more than 10.0⁢𝜎.

Measurement of e+e- →ηJ/ψ cross section from s =3.808 GeV to 4.951 GeV

Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01

Abstract

Using data samples with an integrated luminosity of 22.42  fb^-1 collected by the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the 𝑒+⁢𝑒−→𝜂⁢𝐽/𝜓 process at center-of-mass energies from 3.808 to 4.951 GeV. Three structures are observed in the line shape of the measured cross sections. A maximum-likelihood fit with 𝜓⁡(4040), two additional resonances, and a nonresonant component are performed. The mass and width of the first additional state are (4219.7±2.5±4.5)  MeV/𝑐2 and (80.7±4.4±1.4)  MeV, respectively, consistent with the 𝜓⁡(4230). For the second state, the mass and width are (4386±13±17)  MeV/𝑐2 and (177±32±13)  MeV, respectively, consistent with the 𝜓⁡(4360). The first uncertainties are statistical, and the second ones are systematic. The statistical significance of 𝜓⁡(4040) is 8.0⁢𝜎 and those for 𝜓⁡(4230) and 𝜓⁡(4360) are more than 10.0⁢𝜎.
2024
109
9
092012-1
092012-16
charmonium, ψ(4040), ψ(4230), ψ(4360)
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2027977
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