We report the precise measurements of the cross section of e+e-→hadrons at center-of-mass energies from 3.645 to 3.871 GeV. We thereby perform the most precise study of the cross sections and find a complex system composed of three resonances of R(3760), R(3780), and R(3810). For the first time, we measure the R(3810) electronic width to be (19.4±7.4±12.1) eV. For the R(3760) resonance, we measure the mass to be (3751.9±3.8±2.8) MeV/c2, the total width to be (32.8±5.8±8.7) MeV, and the electronic width to be (184±75±86) eV. For the R(3780) resonance, we measure its mass to be (3778.7±0.5±0.3) MeV/c2, total width to be (20.3±0.8±1.7) MeV, and electronic width to be (265±67±83) eV. Forty-seven years ago, the ψ(3770) resonance was discovered, and was subsequently interpreted as the 1D13-wave dominant state of charmonium. However, our analysis of the total-hadron cross sections indicates that the ψ(3770) is not a single state, but a complex system composed of the R(3760), R(3780), and R(3810) resonances. Among these, we interpret the R(3780) is a resonance dominated by the 1D13 charmonium state.

R (3780) Resonance Interpreted as the 1 D1 3 -Wave Dominant State of Charmonium from Precise Measurements of the Cross Section of e+e- →hadrons

Garzia, I.;
2024

Abstract

We report the precise measurements of the cross section of e+e-→hadrons at center-of-mass energies from 3.645 to 3.871 GeV. We thereby perform the most precise study of the cross sections and find a complex system composed of three resonances of R(3760), R(3780), and R(3810). For the first time, we measure the R(3810) electronic width to be (19.4±7.4±12.1) eV. For the R(3760) resonance, we measure the mass to be (3751.9±3.8±2.8) MeV/c2, the total width to be (32.8±5.8±8.7) MeV, and the electronic width to be (184±75±86) eV. For the R(3780) resonance, we measure its mass to be (3778.7±0.5±0.3) MeV/c2, total width to be (20.3±0.8±1.7) MeV, and electronic width to be (265±67±83) eV. Forty-seven years ago, the ψ(3770) resonance was discovered, and was subsequently interpreted as the 1D13-wave dominant state of charmonium. However, our analysis of the total-hadron cross sections indicates that the ψ(3770) is not a single state, but a complex system composed of the R(3760), R(3780), and R(3810) resonances. Among these, we interpret the R(3780) is a resonance dominated by the 1D13 charmonium state.
2024
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.; Ba...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2597814
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