TY - JOUR

T1 - 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

AU - BESIII Collaboration

AU - Achasov, M. N.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/12/13

Y1 - 2024/12/13

N2 - 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.

AB - 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.

UR - https://www.mendeley.com/catalogue/6b59106a-7865-3ac3-ae7f-00b41e462a15/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85212792925&origin=inward&txGid=4d977738c69ed4bd11b69871f8ddaa7a

UR - https://pubmed.ncbi.nlm.nih.gov/39750337/

U2 - 10.1103/PhysRevLett.133.241902

DO - 10.1103/PhysRevLett.133.241902

M3 - Article

C2 - 39750337

VL - 133

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 24

M1 - 241902

ER -