Measurement of e+e- → π+π- D+D- cross sections at center-of-mass energies from 4.190 to 4.946 GeV

作者：Ablikim, M.; Achasov, M. N.; Adlarson, P.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balossino, I; Ban, Y.; Batozskaya, V; Becker, D.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; Bortone, A.; Boyko, I; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, W. L.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.

来源：Physical Review D, 2022, 106(5): 052012.

DOI：10.1103/PhysRevD.106.052012

• MONTE-CARLO
• RESONANCE
• PHYSICS
• DECAY

Using data samples collected with the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the e(+)e(-) -> pi(+)pi-D+D- process at center-of-mass energies from 4.190 to 4.946 GeV with a partial reconstruction method. Resonance structures are seen and the cross section line shape can be described by the coherent sum of either two Breit-Wigner functions or a Breit-Wigner function and a phase space term. The mass and width of the resonance at about 4.4 GeV are determined to be (4371.6 +/- 2.5 +/- 9.2) MeV/c(2) and (167 +/- 4 +/- 29) MeV, respectively, which are in agreement with those of the psi(4360) or Y(4390) state. The spin-3D-wave charmonium state X(3842) is searched for through the e(+)e(-) -> pi(+)pi X-(3842) -> pi(+)pi-D+D- process, and evidence with a significance of 4.2 sigma is found in the data samples with center-of-mass energies from 4.6 to 4.7 GeV.