Observation of a resonant structure in e+e → ωη and another in e+e → ωπ0 at center-of-mass energies between 2.00 and 3.08 GeV

BESIII Collaboration

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Abstract

Born cross sections for the processes e+e→ωη and e+e→ωπ0 have been determined for center-of-mass energies between 2.00 and 3.08 GeV with the BESIII detector at the BEPCII collider. The results obtained in this work are consistent with previous measurements but with improved precision. Two resonant structures are observed. In the e+e→ωη cross sections, a resonance with a mass of (2176±24±3)MeV/c2 and a width of (89±50±5)MeV is observed with a significance of 6.2σ. Its properties are consistent with the ϕ(2170). In the e+e→ωπ0 cross sections, a resonance denoted Y(2040) is observed with a significance of more than 10σ. Its mass and width are determined to be (2034±13±9)MeV/c2 and (234±30±25)MeV, respectively, where the first uncertainties are statistical and the second ones are systematic.

Original languageEnglish (US)
Article number136059
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume813
DOIs
StatePublished - Feb 10 2021
Externally publishedYes

Bibliographical note

Funding Information:
The BESIII collaboration thanks the staff of BEPCII, the IHEP computing center and the supercomputing center of USTC for their strong support. This work is supported in part by National Key Basic Research Program of China under Contract Nos. 2015CB856700, 2020YFA0406400; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11335008, 11375170, 11475164, 11475169, 11625523, 11605196, 11605198, 11635010, 11705192, 11735014, 11822506, 11835012, 11935015, 11935016, 11935018, 11950410506, 11961141012, 12035013; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U1532102, U1732263, U1832103, U1832207, U2032111; CAS Key Research Program of Frontier Sciences under Contracts Nos. QYZDJ-SSW-SLH003, 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 Contracts Nos. Collaborative Research Center CRC 1044, FOR 2359; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK under Contracts Nos. DH140054, DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374, DE-SC-0012069.

Funding Information:
The BESIII collaboration thanks the staff of BEPCII, the IHEP computing center and the supercomputing center of USTC for their strong support. This work is supported in part by National Key Basic Research Program of China under Contract Nos. 2015CB856700 , 2020YFA0406400 ; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11335008 , 11375170 , 11475164 , 11475169 , 11625523 , 11605196 , 11605198 , 11635010 , 11705192 , 11735014 , 11822506 , 11835012 , 11935015 , 11935016 , 11935018 , 11950410506 , 11961141012 , 12035013 ; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U1532102 , U1732263 , U1832103 , U1832207 , U2032111 ; CAS Key Research Program of Frontier Sciences under Contracts Nos. QYZDJ-SSW-SLH003 , 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 Contracts Nos. Collaborative Research Center CRC 1044 , FOR 2359 ; Istituto Nazionale di Fisica Nucleare , Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470 ; National Science and Technology fund ; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157 ; The Royal Society , UK under Contracts Nos. DH140054 , DH160214 ; The Swedish Research Council ; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374 , DE-SC-0012069 .

Publisher Copyright:
© 2020 The Author(s)

Keywords

  • BESIII
  • Excited ρ states
  • Excited ω states
  • ϕ(2170)

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