TY - JOUR

T1 - Measurement of e + e − → ωπ + π − cross section at √s = 2.000 to 3.080 GeV

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - The BESIII collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. This work is partially supported by the National Key Research and Development Program of China (under Contract Nos. 2020YFA0406400 and 2020YFA0406300), National Natural Science Foundation of China (NSFC; under Contract Nos. 11875262, 12175244, 12175244, 11835012, 11625523, 11635010, 11735014, 11822506, 11835-012, 11935015, 11935016, 11935018, 11625523, 11605196, 11605198, 11705192, 12035013, 11961141012, 11950410506, and 12061131003), the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program, Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (under Contract Nos. U2032110, U1732263, U1832207, U1832103, and U2032111), CAS Key Research Program of Frontier Sciences (under Contract Nos. QYZDJ-SSW-SLH003 and QYZDJ-SSW-SLH040), 100 Talents Program of CAS, INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology, ERC (under Contract No. 758462), German Research Foundation DFG (under Contract No. 443159800, Collaborative Research Center CRC 1044, FOR 2359, FOR 2359, GRK 214), Istituto Nazionale di Fisica Nucleare (Italy), Ministry of Development of Turkey (under Contract No. DPT2006K-120470), National Science and Technology fund, Olle Engkvist Foundation (under Contract No. 200-0605), STFC (United Kingdom), The Knut and Alice Wallenberg Foundation (Sweden; under Contract No. 2016.0157), The Royal Society (U.K., under Contract Nos. DH140054 and DH160214), The Swedish Research Council, and U. S. Department of Energy (under Contract Nos. DE-FG02-05ER41374 and DE-SC-0012069).

PY - 2023/1

Y1 - 2023/1

N2 - A partial wave analysis on the process e+e− → ωπ+π− is performed using 647 pb−1 of data sample collected by using the BESIII detector operating at the BEPCII storage ring at center-of-mass (c.m.) energies from 2.000 GeV to 3.080 GeV. The Born cross section of the e+e− → ωπ+π− process is measured, with precision improved by a factor of 3 compared to that of previous studies. A structure near 2.25 GeV is observed in the energy-dependent cross sections of e+e− → ωπ+π− and ωπ0π0 with a statistical significance of 7.6σ, and its determined mass and width are 2232 ± 19 ± 27 MeV/c2 and 93 ± 53 ± 20 MeV, respectively, where the first and second uncertainties are statistical and systematic, respectively. By analyzing the cross sections of subprocesses e+e− → ωf0(500), ωf0(980), ωf0(1370), ωf2(1270), and b1(1235)π, a structure, with mass M = 2200 ± 11 ± 17 MeV/c2 and width Γ = 74 ± 20 ± 24 MeV, is observed with a combined statistical significance of 7.9σ. The measured resonance parameters will help to reveal the nature of vector states around 2.25 GeV.

AB - A partial wave analysis on the process e+e− → ωπ+π− is performed using 647 pb−1 of data sample collected by using the BESIII detector operating at the BEPCII storage ring at center-of-mass (c.m.) energies from 2.000 GeV to 3.080 GeV. The Born cross section of the e+e− → ωπ+π− process is measured, with precision improved by a factor of 3 compared to that of previous studies. A structure near 2.25 GeV is observed in the energy-dependent cross sections of e+e− → ωπ+π− and ωπ0π0 with a statistical significance of 7.6σ, and its determined mass and width are 2232 ± 19 ± 27 MeV/c2 and 93 ± 53 ± 20 MeV, respectively, where the first and second uncertainties are statistical and systematic, respectively. By analyzing the cross sections of subprocesses e+e− → ωf0(500), ωf0(980), ωf0(1370), ωf2(1270), and b1(1235)π, a structure, with mass M = 2200 ± 11 ± 17 MeV/c2 and width Γ = 74 ± 20 ± 24 MeV, is observed with a combined statistical significance of 7.9σ. The measured resonance parameters will help to reveal the nature of vector states around 2.25 GeV.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85146766282&origin=inward&txGid=ea04078c08dcd749f5cd36bdeb062002

U2 - 10.1007/JHEP01(2023)111

DO - 10.1007/JHEP01(2023)111

M3 - Article

VL - 2023

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 1

M1 - 111

ER -